MOTOR AS 3097648 - Caterpillar

Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.
Turbocharger bearing failures can cause large quantities of oil to enter the air intake and exhaust systems. Loss of engine lubricant can result in serious engine damage.Minor leakage of oil into a turbocharger under extended low idle operation should not cause problems as long as a turbocharger bearing failure has not occurred.When a turbocharger bearing failure is accompanied by a significant engine performance loss (exhaust smoke or engine rpm up at no load), do not continue engine operation until the turbocharger is renewed.
A visual inspection of the turbocharger can minimize unscheduled downtime. A visual inspection of the turbocharger can also reduce the chance for potential damage to other engine parts. Do not inspect the engine with the engine in operation.
Illustration 1 g02603804
Typical example
Ensure that the turbocharger is clean and free from dirt before removing components for inspection.
Remove the air intake pipe (1). Visually inspect the piping for the presence of oil. A small amount oil will be expected, this oil is due to the breather system design. Clean the interior of the pipe in order to prevent dirt from entering during reassembly.
Check for obvious heat discoloration of the turbocharger. Check for any loose bolts or any missing bolts. Check for damage to the oil supply line (3) and the oil drain line (2). Check for cracks in the housing of the turbocharger. Ensure that the compressor wheel can rotate freely. Check that there are no visual signs of damage to the compressor wheel.
Check for the presence of oil. If oil is leaking from the back side of the compressor wheel, there is a possibility of a failed turbocharger oil seal. The presence of oil may be the result of extended engine operation at low idle. The presence of oil may also be the result of a restriction of the line for the intake air (clogged air filters). A restriction can cause the turbocharger to slobber.
Install the air intake pipe to the turbocharger housing. Ensure that all clamps are installed correctly and that all clamps are tightened securely. For more information, refer to Systems Operation, Testing, and Adjusting, "Turbocharger - Inspect".