Remove the air intake and charge-air cooler piping from the turbocharger.

Examine the compressor intake and discharge for oil.

If oil is present in the compressor intake as well as the discharge, check upstream of the turbocharger for the source of the oil.

If oil is present only in the discharge side, check for intake restriction. Refer to Procedure 010-031 in Section 10.

If no intake restriction is found, replace the turbocharger. Refer to Procedure 010-033 in Section 10.

Install the air intake and charge-air cooler piping to the turbocharger and tighten the clamp.

Operate the engine at full throttle and maximum load, and check for air leaks.