SERVICE MANUAL CONDITION POSSIBLE CAUSE REMEDY Compressor End Dirty. a. Excessive intake restriction or a. Check for clogged air cleaner a restricted oil drain line. element, collapsed hose or leaks in air inlet pipe.  Clean compressor end and oil drain line. b. Insufficient air filtration. b. Secure the connections be- tween the air cleaner and turbocharger. c. Long period of operation without c. Disassemble and clean the cleaning. unit. Compressor Wheel a.    Rubbing on OD a. Worn bearing or unbalanced a. Replace parts as necessary. of blades, turbine wheel. b.    Rubbing on cover b. Insufficient clearance, cover b. Improper end play.  Replace or back face. damaged or thrust washer worn. damaged or worn parts. c. Inlet leading edge c. Loose pieces in air intake system. c. Check air intake system for of blades either loose nuts, bolts or other worn or pieces foreign material.  Replace broken off. wheel assembly. Shaft Rotation Wheel drags a. Carbon buildup behind turbine a. Disassemble and clean the wheel or dirt accumulation be- unit. hind compressor wheel. b. Bearing worn excessively or b. Replace bearing and change seized to shaft due to dirty oil oil. or low oil pressure. Shaft End Play a.    End play exceeds a. Thrust bearing or thrust rings a. Replace parts as necessary. specifications, worn or distorted. b.    End play less than b. Carbon buildup behind turbine b. Disassemble and clean the unit. specifications. wheel or dirt buildup behind compressor wheel. Turbine Wheel Radial Movement a.    Radial movement a. Worn bearings or shaft,  or a. Replace worn parts. exceeds specifi- bore in bearing housing worn, cations. CTS-4104 PRINTED IN THE UNITED STATES OF AMERICA Page 20