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UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to OUR 6 RULES FOR BORROWING TOOLS If you are borrowing tools from another tech, show some respect for them and treat them properly. #3 - Clean it. By the very nature of the areas of a motor vehicle we work on, tools get dirty, thats fine. Don't go and dump a greasy, oily tool back in someone elses toolbox.In
FREEVALVE’S CAMLESS ENGINE EXPLAINED UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCYSEE MOREON MECHANIC.COM.AU
DUAL MASS FLYWHEELS EXPLAINED Dual mass flywheels were introduced primarily to reduce engine vibrations that damage manual gearboxes in various ways, with the degree of damage being largely proportional to the amplitude of the vibrations. However, it should be noted that not all applications are, or had been susceptible to gearbox damage caused by engine vibrations,which
FORD’S 6.7L POWERSTROKE ENGINE: SOME SERVICING CONCERNS These kinds of issues can be tricky to diagnose on any Powerstroke engine, but as far as the 6.7L engine is concerned, the diagnostic procedure would follow the general pattern outlined below-. 1) Since this system requires a minimum pressure of 5000 psi for the injectors to work, you need to monitor the fuel pressure with a scan tool while HOW MANY CCA DO YOU REALLY NEED? Summer Starting (Petrol): 150-200A. Summer Starting (Diesel): 450-550A. Winter Starting (Petrol): 250-350A. Winter Starting Diesel: 700-800A. As this table shows, the need for excessive amounts of CCA to start the engine has changed due to advancements in vehicle technology such as gear reduction starter motors supported with lowcut in
UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to OUR 6 RULES FOR BORROWING TOOLS If you are borrowing tools from another tech, show some respect for them and treat them properly. #3 - Clean it. By the very nature of the areas of a motor vehicle we work on, tools get dirty, thats fine. Don't go and dump a greasy, oily tool back in someone elses toolbox.In
FREEVALVE’S CAMLESS ENGINE EXPLAINED UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCYSEE MOREON MECHANIC.COM.AU
DUAL MASS FLYWHEELS EXPLAINED Dual mass flywheels were introduced primarily to reduce engine vibrations that damage manual gearboxes in various ways, with the degree of damage being largely proportional to the amplitude of the vibrations. However, it should be noted that not all applications are, or had been susceptible to gearbox damage caused by engine vibrations,which
FORD’S 6.7L POWERSTROKE ENGINE: SOME SERVICING CONCERNS These kinds of issues can be tricky to diagnose on any Powerstroke engine, but as far as the 6.7L engine is concerned, the diagnostic procedure would follow the general pattern outlined below-. 1) Since this system requires a minimum pressure of 5000 psi for the injectors to work, you need to monitor the fuel pressure with a scan tool while OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds DUAL MASS FLYWHEELS EXPLAINED Dual mass flywheels were introduced primarily to reduce engine vibrations that damage manual gearboxes in various ways, with the degree of damage being largely proportional to the amplitude of the vibrations. However, it should be noted that not all applications are, or had been susceptible to gearbox damage caused by engine vibrations,which
GASKET GOLDEN RULES
Gasket Golden Rules - Part 2. 23 April 2021. Given that the head gasket is one of the most critical and time consuming gaskets to replace on an engine, we felt it deserved it’s own article. The 3 key things we need to be mindful of when it comes to successful head gasket replacement are correctly prepared deck surfaces on both theblock and
EXHAUST BACKPRESSURE: DO WE NEED IT? In reality, exhaust backpressure is a resistance to the positive flow of the exhaust stream through the exhaust system that actively prevents effective exhaust gas scavenging. In terms of symptoms, poor exhaust gas scavenging can cause engine overheating, poor fuel economy, severe power losses, and in severe cases, it can prevent theengine
HOW TO DEAL WITH COMEBACKS AND REPEAT REPAIRS 22 January 2019 It is often said that comebacks and repeat repairs can be blamed purely on the complexity of modern vehicles. However, despite the increasing complexity of modern vehicles, the fact is that there is much that we, both workshop owners and technicians, can do to reduce the incidence of comebacks, if we cannot eliminate themaltogether.
SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS The first possibility, warped rotors, is easy to confirm or eliminate, and this writer has done so many times simply by rotating a bolted-down brake rotor between two dial gauges- one on either side of the rotor, with the caliper removed to allow placement of the second gauge. If the rotor is warped, two dial gauges placed directlyopposite
TIMING CHAINS DON'T ACTUALLY STRETCH 20 February 2018. Timing chain stretch is not actually the ‘stretching’ of the chain, it’s an elongation of the timing chain caused by wear in the chains components. The most common cause of this phenomenon is actually lack of maintenance and regular oil changes using a quality oil. Contaminated and unserviceable oil losesits ability to
SUPER KNOCK: HERE’S HOW AND WHY IT DESTROYS MODERN ENGINES In practice though, the term “super knock” is a generic reference to several principal types of engine knock that are characterised by the facts that a), combustion pressures are higher than those occurring during pre-ignition, and b), all forms of super knock have the potential to damage an engine. As a practical matter, these formsof
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
HYUNDAI/KIA STEERING COUPLING BUSH REPLACEMENT Simply place these parts onto the power steering motor shaft after the new bush is fitted. (Parts shown below) When refitting the power steering motor to the steering column, ensure the coupling is correctly lined up and that the power steering motor is pulled down evenly onto the steering column to assure proper alignment. UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS 15 March 2019. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. FREEVALVE’S CAMLESS ENGINE EXPLAINED DIAGNOSING BMW’S VALVETRONIC SYSTEM UNDERSTANDING CAN BUS FAULTS 1 August 2019 Do you have a diagnostic comfort zone? Do you feel more comfortable diagnosing only certain types of faults or issues, and tend to shy away from attempting to diagnose faults in areas that fall outside of what you know best? TIGHTENING ENGINE BOLTS, THE RIGHT WAY 15 February 2019. We have all encountered the following scenario at some point in our careers: a customer presents a vehicle on which the cylinder head gasket had been replaced with an OEM replacement X-number of months ago, and which now displays unmistakable signs that the replacement gasket had blown again. OUR 6 RULES FOR BORROWING TOOLS 8 January 2018. Loaning out tools is something that happens often in a workshop setting. When you happen to be on the borrowing end there are 6 Golden Rules we think you should follow FORD’S 6.7L POWERSTROKE ENGINE: SOME SERVICING CONCERNS 4 November 2019. Although it is true that Ford’s Powerstroke family of engines has a legion of fans, it would also be true to say that diesel technicians the world over are not overly fond of this series of engines, mainly because they are notoriously difficult to work on. INTAKE RUNNER CONTROL STRATEGIES EXPLAINED 1 March 2019. Have you only ever thought of the intake manifold on an engine merely as a set of pipes that channels intake air into the engine? Well, an intake manifold does do that, and while it usually gets in the way when you want to work on something else, the fact is that an intake manifold on a modern engine is a highly engineered component that is critical to efficient engine operation. CATCH-CANS DON'T WORK? 12 January 2018 First off, lets take a quick look at how a catch can is supposed to work. As part of the operation of a typical internal combustion engine, a percentage of the combustion gas leaks past thepiston rings.
HYUNDAI/KIA STEERING COUPLING BUSH REPLACEMENT If so, it's likely that the vehicle has a worn MDPS (Motor Driven Power Steering) coupling bush. Mechanic.com.au member Jon Wolridge from Maroochy Car Care kindly sent in some details regarding a recent repair he carried out on a Hyundai i30. UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS 15 March 2019. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. FREEVALVE’S CAMLESS ENGINE EXPLAINED DIAGNOSING BMW’S VALVETRONIC SYSTEM UNDERSTANDING CAN BUS FAULTS 1 August 2019 Do you have a diagnostic comfort zone? Do you feel more comfortable diagnosing only certain types of faults or issues, and tend to shy away from attempting to diagnose faults in areas that fall outside of what you know best? TIGHTENING ENGINE BOLTS, THE RIGHT WAY 15 February 2019. We have all encountered the following scenario at some point in our careers: a customer presents a vehicle on which the cylinder head gasket had been replaced with an OEM replacement X-number of months ago, and which now displays unmistakable signs that the replacement gasket had blown again. OUR 6 RULES FOR BORROWING TOOLS 8 January 2018. Loaning out tools is something that happens often in a workshop setting. When you happen to be on the borrowing end there are 6 Golden Rules we think you should followMECHANIC.COM.AU
Learn More. Learn more from the fresh content published weekly by the Mechanic.com.au team and our partners. OUR 6 RULES FOR BORROWING TOOLS 8 January 2018. Loaning out tools is something that happens often in a workshop setting. When you happen to be on the borrowing end there are 6 Golden Rules we think you should follow DIFFERENTIAL NOISE & VIBRATION: HERE’S HOW TO DIAGNOSE THE 2 December 2019 What is your first reaction when you are presented with an RWD, 4WD, or AWD vehicle that is exhibiting clear symptoms of a worn or damaged differential? TIGHTENING ENGINE BOLTS, THE RIGHT WAY 15 February 2019. We have all encountered the following scenario at some point in our careers: a customer presents a vehicle on which the cylinder head gasket had been replaced with an OEM replacement X-number of months ago, and which now displays unmistakable signs that the replacement gasket had blown again. HOW MANY CCA DO YOU REALLY NEED? 2 April 2018 CCA, MCA, PHCA and HCA are all ratings that measure the current of a battery to deliver power to crank an engine. For many years now cold cranking amperes (CCA) has been widely used as a bench marking measurement to compare batteries. SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS 17 September 2018 What is the standard remedy for steering wheel vibration and brake pedal pulsation under normal braking? In most cases, we conclude that the brake rotors have DTV (Disc Thickness Variation) and we replace or re-machine the rotors as a matter ofcourse, right?
INTAKE RUNNER CONTROL STRATEGIES EXPLAINED 1 March 2019. Have you only ever thought of the intake manifold on an engine merely as a set of pipes that channels intake air into the engine? Well, an intake manifold does do that, and while it usually gets in the way when you want to work on something else, the fact is that an intake manifold on a modern engine is a highly engineered component that is critical to efficient engine operation. HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCY 2 September 2019 If you are not a diesel mechanic or have not had much exposure to diesel engine technology, you may not know that a), diesel engines with common rail fuel injection can be up to twice as efficient as petrol engines, and b), what to tell a customer who is complaining about his diesel vehicle becoming progressively less“peppy”.
TIMING CHAINS DON'T ACTUALLY STRETCH 20 February 2018. Timing chain stretch is not actually the ‘stretching’ of the chain, it’s an elongation of the timing chain caused by wear in the chains components. CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? 2 October 2018 As experienced technicians, we have all seen how defective turbochargers can damage catalytic converters and diesel particulate filters (DPF), but have you ever wondered if the opposite is true; can a defective or clogged DPF damage a turbocharger? FREEVALVE’S CAMLESS ENGINE EXPLAINED UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. TIGHTENING ENGINE BOLTS, THE RIGHT WAY Tighten all bolts in sequence, and in two stages to a snug torque value of say, 30 Nm. Apply a 90 degree rotation to all bolts in the proper tightening sequence. Apply a further 90 degree rotation to all bolts in the proper tightening sequence. NOTE: The example of a tightening procedure above is just that, an example that is intendedfor
DIAGNOSING BMW’S VALVETRONIC SYSTEM YOU MAY HIDE IT UNDER THE BONNET BUT THIS AGM’S SECRET You may hide it under the bonnet but this AGM’s secret will be short-lived. Utilising advanced Absorbed Glass Mat (AGM) Technology, the toughest internal lead components and latest design features along with being competitively priced, this made for Australian conditions battery is set to be one of the most versatile batteries on themarket.
CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering INTAKE RUNNER CONTROL STRATEGIES EXPLAINED Runner control flaps can be thought of as a set of secondary throttle flaps, whose purpose it is to control the speed at which intake air flows into the intake ports. In practice, the flaps never close off the intake ports completely; in the closed position, the flaps reduce the effective diameter of the intake runner by about 60% at low engine FORD’S 6.7L POWERSTROKE ENGINE: SOME SERVICING CONCERNS These kinds of issues can be tricky to diagnose on any Powerstroke engine, but as far as the 6.7L engine is concerned, the diagnostic procedure would follow the general pattern outlined below-. 1) Since this system requires a minimum pressure of 5000 psi for the injectors to work, you need to monitor the fuel pressure with a scan tool while HYUNDAI/KIA STEERING COUPLING BUSH REPLACEMENT Simply place these parts onto the power steering motor shaft after the new bush is fitted. (Parts shown below) When refitting the power steering motor to the steering column, ensure the coupling is correctly lined up and that the power steering motor is pulled down evenly onto the steering column to assure proper alignment. FREEVALVE’S CAMLESS ENGINE EXPLAINED UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. TIGHTENING ENGINE BOLTS, THE RIGHT WAY Tighten all bolts in sequence, and in two stages to a snug torque value of say, 30 Nm. Apply a 90 degree rotation to all bolts in the proper tightening sequence. Apply a further 90 degree rotation to all bolts in the proper tightening sequence. NOTE: The example of a tightening procedure above is just that, an example that is intendedfor
DIAGNOSING BMW’S VALVETRONIC SYSTEM YOU MAY HIDE IT UNDER THE BONNET BUT THIS AGM’S SECRET You may hide it under the bonnet but this AGM’s secret will be short-lived. Utilising advanced Absorbed Glass Mat (AGM) Technology, the toughest internal lead components and latest design features along with being competitively priced, this made for Australian conditions battery is set to be one of the most versatile batteries on themarket.
CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering INTAKE RUNNER CONTROL STRATEGIES EXPLAINED Runner control flaps can be thought of as a set of secondary throttle flaps, whose purpose it is to control the speed at which intake air flows into the intake ports. In practice, the flaps never close off the intake ports completely; in the closed position, the flaps reduce the effective diameter of the intake runner by about 60% at low engine FORD’S 6.7L POWERSTROKE ENGINE: SOME SERVICING CONCERNS These kinds of issues can be tricky to diagnose on any Powerstroke engine, but as far as the 6.7L engine is concerned, the diagnostic procedure would follow the general pattern outlined below-. 1) Since this system requires a minimum pressure of 5000 psi for the injectors to work, you need to monitor the fuel pressure with a scan tool while HYUNDAI/KIA STEERING COUPLING BUSH REPLACEMENT Simply place these parts onto the power steering motor shaft after the new bush is fitted. (Parts shown below) When refitting the power steering motor to the steering column, ensure the coupling is correctly lined up and that the power steering motor is pulled down evenly onto the steering column to assure proper alignment. UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. HOW MANY CCA DO YOU REALLY NEED? Summer Starting (Petrol): 150-200A. Summer Starting (Diesel): 450-550A. Winter Starting (Petrol): 250-350A. Winter Starting Diesel: 700-800A. As this table shows, the need for excessive amounts of CCA to start the engine has changed due to advancements in vehicle technology such as gear reduction starter motors supported with lowcut in
GASKET GOLDEN RULES
Gasket Golden Rules - Part 1. 16 April 2021. Finding and effectively sealing leaks can sometimes be frustrating and time consuming. In this article we take a look at the golden rules to follow to eliminate leaks no matter where they are coming from. OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCY Even though diesel fuel has a significant energy density advantage over petrol, less than 50% of a diesel engine’s overall efficiency derives from this. In practice, about 60% percent derives from a combination of a diesel engines’-. long stroke. low RPM’s. forced induction coupled with a DIFFERENTIAL NOISE & VIBRATION: HERE’S HOW TO DIAGNOSE THE As a practical matter, the TTP of a differential is established by a combination of bearing pre-loads and backlash, with backlash being a function of how well (or otherwise) the gear train is set up. Therefore, n TTP value that exceeds a specified value is indicative of excessive bearing pre-loads and/or insufficient backlash, while a TTPvalue
TIMING CHAINS DON'T ACTUALLY STRETCH 20 February 2018. Timing chain stretch is not actually the ‘stretching’ of the chain, it’s an elongation of the timing chain caused by wear in the chains components. The most common cause of this phenomenon is actually lack of maintenance and regular oil changes using a quality oil. Contaminated and unserviceable oil losesits ability to
INTAKE RUNNER CONTROL STRATEGIES EXPLAINED Runner control flaps can be thought of as a set of secondary throttle flaps, whose purpose it is to control the speed at which intake air flows into the intake ports. In practice, the flaps never close off the intake ports completely; in the closed position, the flaps reduce the effective diameter of the intake runner by about 60% at low engine SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS The first possibility, warped rotors, is easy to confirm or eliminate, and this writer has done so many times simply by rotating a bolted-down brake rotor between two dial gauges- one on either side of the rotor, with the caliper removed to allow placement of the second gauge. If the rotor is warped, two dial gauges placed directlyopposite
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
HOW MANY CCA DO YOU REALLY NEED? Summer Starting (Petrol): 150-200A. Summer Starting (Diesel): 450-550A. Winter Starting (Petrol): 250-350A. Winter Starting Diesel: 700-800A. As this table shows, the need for excessive amounts of CCA to start the engine has changed due to advancements in vehicle technology such as gear reduction starter motors supported with lowcut in
UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. YOU MAY HIDE IT UNDER THE BONNET BUT THIS AGM’S SECRET You may hide it under the bonnet but this AGM’s secret will be short-lived. Utilising advanced Absorbed Glass Mat (AGM) Technology, the toughest internal lead components and latest design features along with being competitively priced, this made for Australian conditions battery is set to be one of the most versatile batteries on themarket.
OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering OUR 6 RULES FOR BORROWING TOOLS If you are borrowing tools from another tech, show some respect for them and treat them properly. #3 - Clean it. By the very nature of the areas of a motor vehicle we work on, tools get dirty, thats fine. Don't go and dump a greasy, oily tool back in someone elses toolbox.In
HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCYSEE MOREON MECHANIC.COM.AU
SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS The first possibility, warped rotors, is easy to confirm or eliminate, and this writer has done so many times simply by rotating a bolted-down brake rotor between two dial gauges- one on either side of the rotor, with the caliper removed to allow placement of the second gauge. If the rotor is warped, two dial gauges placed directlyopposite
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
HOW MANY CCA DO YOU REALLY NEED? Summer Starting (Petrol): 150-200A. Summer Starting (Diesel): 450-550A. Winter Starting (Petrol): 250-350A. Winter Starting Diesel: 700-800A. As this table shows, the need for excessive amounts of CCA to start the engine has changed due to advancements in vehicle technology such as gear reduction starter motors supported with lowcut in
UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. YOU MAY HIDE IT UNDER THE BONNET BUT THIS AGM’S SECRET You may hide it under the bonnet but this AGM’s secret will be short-lived. Utilising advanced Absorbed Glass Mat (AGM) Technology, the toughest internal lead components and latest design features along with being competitively priced, this made for Australian conditions battery is set to be one of the most versatile batteries on themarket.
OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering OUR 6 RULES FOR BORROWING TOOLS If you are borrowing tools from another tech, show some respect for them and treat them properly. #3 - Clean it. By the very nature of the areas of a motor vehicle we work on, tools get dirty, thats fine. Don't go and dump a greasy, oily tool back in someone elses toolbox.In
HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCYSEE MOREON MECHANIC.COM.AU
SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS The first possibility, warped rotors, is easy to confirm or eliminate, and this writer has done so many times simply by rotating a bolted-down brake rotor between two dial gauges- one on either side of the rotor, with the caliper removed to allow placement of the second gauge. If the rotor is warped, two dial gauges placed directlyopposite
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
MECHANIC.COM.AU
Learn More. Learn more from the fresh content published weekly by the Mechanic.com.au team and our partners. OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds THE HIT AND MISS NATURE OF CYLINDER DEACTIVATION SYSTEMS The Hit and Miss Nature of Cylinder Deactivation Systems. 28 October 2019. Cylinder deactivation is not exactly a new engine technology, and while it was never widely adopted, GM first used it on some Cadillac models more than 20 years ago. If truth were told though, the operation of the first iterations of cylinder deactivation systems wasnot
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
DIAGNOSING BMW’S VALVETRONIC SYSTEM Diagnosing BMW’s Valvetronic System. In a previous article titled "Understanding BMW's Valvetronic System", we discussed the workings of a mechanical system BMW had developed to alter the lift of the intake valves on equipped engines in some detail. While Valvetronic systems are reasonably robust and reliable, they are not immune to faults HOW TO DEAL WITH COMEBACKS AND REPEAT REPAIRS 22 January 2019 It is often said that comebacks and repeat repairs can be blamed purely on the complexity of modern vehicles. However, despite the increasing complexity of modern vehicles, the fact is that there is much that we, both workshop owners and technicians, can do to reduce the incidence of comebacks, if we cannot eliminate themaltogether.
DUAL MASS FLYWHEELS EXPLAINED Dual mass flywheels were introduced primarily to reduce engine vibrations that damage manual gearboxes in various ways, with the degree of damage being largely proportional to the amplitude of the vibrations. However, it should be noted that not all applications are, or had been susceptible to gearbox damage caused by engine vibrations,which
DIFFERENTIAL NOISE & VIBRATION: HERE’S HOW TO DIAGNOSE THE As a practical matter, the TTP of a differential is established by a combination of bearing pre-loads and backlash, with backlash being a function of how well (or otherwise) the gear train is set up. Therefore, n TTP value that exceeds a specified value is indicative of excessive bearing pre-loads and/or insufficient backlash, while a TTPvalue
AIRBAG DEACTIVATION TIPS: HOW TO AVOID ACCIDENTAL Insulate the terminal with insulation tape after disconnection to prevent contact with the bodywork. Wait at least 60 seconds (with the battery negative disconnected) to allow capacitors in the airbag control module and its back-up power supply to discharge before disconnecting the airbag control module from the wiring harness. EXHAUST BACKPRESSURE: DO WE NEED IT? In reality, exhaust backpressure is a resistance to the positive flow of the exhaust stream through the exhaust system that actively prevents effective exhaust gas scavenging. In terms of symptoms, poor exhaust gas scavenging can cause engine overheating, poor fuel economy, severe power losses, and in severe cases, it can prevent theengine
HOW MANY CCA DO YOU REALLY NEED? Summer Starting (Petrol): 150-200A. Summer Starting (Diesel): 450-550A. Winter Starting (Petrol): 250-350A. Winter Starting Diesel: 700-800A. As this table shows, the need for excessive amounts of CCA to start the engine has changed due to advancements in vehicle technology such as gear reduction starter motors supported with lowcut in
UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. YOU MAY HIDE IT UNDER THE BONNET BUT THIS AGM’S SECRET You may hide it under the bonnet but this AGM’s secret will be short-lived. Utilising advanced Absorbed Glass Mat (AGM) Technology, the toughest internal lead components and latest design features along with being competitively priced, this made for Australian conditions battery is set to be one of the most versatile batteries on themarket.
OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering OUR 6 RULES FOR BORROWING TOOLS If you are borrowing tools from another tech, show some respect for them and treat them properly. #3 - Clean it. By the very nature of the areas of a motor vehicle we work on, tools get dirty, thats fine. Don't go and dump a greasy, oily tool back in someone elses toolbox.In
HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCYSEE MOREON MECHANIC.COM.AU
SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS The first possibility, warped rotors, is easy to confirm or eliminate, and this writer has done so many times simply by rotating a bolted-down brake rotor between two dial gauges- one on either side of the rotor, with the caliper removed to allow placement of the second gauge. If the rotor is warped, two dial gauges placed directlyopposite
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
HOW MANY CCA DO YOU REALLY NEED? Summer Starting (Petrol): 150-200A. Summer Starting (Diesel): 450-550A. Winter Starting (Petrol): 250-350A. Winter Starting Diesel: 700-800A. As this table shows, the need for excessive amounts of CCA to start the engine has changed due to advancements in vehicle technology such as gear reduction starter motors supported with lowcut in
UNDERSTANDING SHORT TERM AND LONG TERM FUEL TRIMS Understanding Short Term and Long Term Fuel Trims. The concept of fuel trims, and how an ECU uses fuel trims to maintain a stoichiometric balance between fuel and air on petrol engines is probably among the least understood aspects of modern engine and fuel management systems today. However, the process of trimming the air/fuel mixture to UNDERSTANDING CAN BUS FAULTS Typical CAN bus circuit faults you are most likely to see. While CAN bus system failures and their associated symptoms are many and varied, and in some instances, vehicle specific, most serious CAN failures, defects, and/or malfunctions can (and do) cause a partial of complete loss of system functionality, and even immobilisation of the vehicle. YOU MAY HIDE IT UNDER THE BONNET BUT THIS AGM’S SECRET You may hide it under the bonnet but this AGM’s secret will be short-lived. Utilising advanced Absorbed Glass Mat (AGM) Technology, the toughest internal lead components and latest design features along with being competitively priced, this made for Australian conditions battery is set to be one of the most versatile batteries on themarket.
OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds CATCH-CANS DON'T WORK? Why Catch Cans don't work. It's not so much a matter of oil catch cans not working, but moreso the fact that not all 'catch cans' are made equal. The problem is that the majority of generic 'catch cans' are simply a chamber with no internal baffling or filtration. Fitting one of these units to a vehicle will have little no effect in filtering OUR 6 RULES FOR BORROWING TOOLS If you are borrowing tools from another tech, show some respect for them and treat them properly. #3 - Clean it. By the very nature of the areas of a motor vehicle we work on, tools get dirty, thats fine. Don't go and dump a greasy, oily tool back in someone elses toolbox.In
HERE’S WHY DIESEL ENGINES BEGIN TO LOSE POWER & EFFICIENCYSEE MOREON MECHANIC.COM.AU
SOLVED: THE MYSTERY OF WARPED BRAKE ROTORS The first possibility, warped rotors, is easy to confirm or eliminate, and this writer has done so many times simply by rotating a bolted-down brake rotor between two dial gauges- one on either side of the rotor, with the caliper removed to allow placement of the second gauge. If the rotor is warped, two dial gauges placed directlyopposite
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
MECHANIC.COM.AU
Learn More. Learn more from the fresh content published weekly by the Mechanic.com.au team and our partners. OSCILLOSCOPE DIAGNOSTICS MADE EASY Set the scale on the scope to a range that falls between about 10% lower than the minimum allowable fuel rail pressure, and about 10% higher than the maximum allowable fuel rail pressure for the best results. Set the time base to about 50 milliseconds THE HIT AND MISS NATURE OF CYLINDER DEACTIVATION SYSTEMS The Hit and Miss Nature of Cylinder Deactivation Systems. 28 October 2019. Cylinder deactivation is not exactly a new engine technology, and while it was never widely adopted, GM first used it on some Cadillac models more than 20 years ago. If truth were told though, the operation of the first iterations of cylinder deactivation systems wasnot
CAN A CLOGGED DPF DAMAGE A TURBOCHARGER? Since a clogged diesel particulate filter prevents the free flow of exhaust gas through the exhaust system, the restriction can have several effects on a turbocharger, although the severity of one or more effects may vary according to the application, and the degree to which the diesel particulate filter is restricting the flow of exhaustgas.
DIAGNOSING BMW’S VALVETRONIC SYSTEM Diagnosing BMW’s Valvetronic System. In a previous article titled "Understanding BMW's Valvetronic System", we discussed the workings of a mechanical system BMW had developed to alter the lift of the intake valves on equipped engines in some detail. While Valvetronic systems are reasonably robust and reliable, they are not immune to faults HOW TO DEAL WITH COMEBACKS AND REPEAT REPAIRS 22 January 2019 It is often said that comebacks and repeat repairs can be blamed purely on the complexity of modern vehicles. However, despite the increasing complexity of modern vehicles, the fact is that there is much that we, both workshop owners and technicians, can do to reduce the incidence of comebacks, if we cannot eliminate themaltogether.
DUAL MASS FLYWHEELS EXPLAINED Dual mass flywheels were introduced primarily to reduce engine vibrations that damage manual gearboxes in various ways, with the degree of damage being largely proportional to the amplitude of the vibrations. However, it should be noted that not all applications are, or had been susceptible to gearbox damage caused by engine vibrations,which
DIFFERENTIAL NOISE & VIBRATION: HERE’S HOW TO DIAGNOSE THE As a practical matter, the TTP of a differential is established by a combination of bearing pre-loads and backlash, with backlash being a function of how well (or otherwise) the gear train is set up. Therefore, n TTP value that exceeds a specified value is indicative of excessive bearing pre-loads and/or insufficient backlash, while a TTPvalue
AIRBAG DEACTIVATION TIPS: HOW TO AVOID ACCIDENTAL Insulate the terminal with insulation tape after disconnection to prevent contact with the bodywork. Wait at least 60 seconds (with the battery negative disconnected) to allow capacitors in the airbag control module and its back-up power supply to discharge before disconnecting the airbag control module from the wiring harness. EXHAUST BACKPRESSURE: DO WE NEED IT? In reality, exhaust backpressure is a resistance to the positive flow of the exhaust stream through the exhaust system that actively prevents effective exhaust gas scavenging. In terms of symptoms, poor exhaust gas scavenging can cause engine overheating, poor fuel economy, severe power losses, and in severe cases, it can prevent theengine
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