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Duramax LLY – TURBOCHARGER SERVICE AND DIAGNOSIS

The turbocharger used on 6.5L diesel engines is a Borg Warner model 1H1 (Figure 2-7). Lubrication is by engine oil from the engine lubrication system.
Boost is monitored by the PCM and controlled by the wastegate and electronic accelerator pedal. The pedal assembly consists of a bracket, pedal and arm, and the pedal position sensor (potentiometer); a conventional throttle linkage is not used.

The turbocharger is mounted in the lifter valley at the rear of the engine block. It is positioned between the two halves of the intake manifold.

A turbocharger is fundamentally an air pump used to generate additional engine power. This is accomplished by increasing volume and pressure of air entering the engine combustion chambers. An increase in air volume allows a proportional increase in fuel injected into the cylinders. The net result is a denser fuel/air mixture. A denser mixture produces more power when compressed and burned in the combustion chamber.

A turbocharger feature concerns the method of operation. The turbocharger turbine and compressor impellers are rotated by the flow of engine exhaust gases. As a result, separate drive belts and pulleys are not needed.

The turbocharger used on 6.5L engines consists of a turbine impeller and housing, a compressor impeller and housing, a wastegate, a wastegate actuator and an impeller connecting shaft (Figure 2-8). A separate, belt driven vacuum pump supplies vacuum for wastegate actuator operation.

 

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