TM 9-2350-277-20-2PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDINGLUBRICATION INSTRUCTIONS — Continued0155 00ITEMNO.INTERVALMAN-HOURITEM TO BECHECKED ORSERVICEDCREWMEMBERPROCEDUREEQUIPMENTNOT READY/AVAILABLEIF:c. Remove the four bolts, washers and gasket fromthe access cover under the vehicle directly underthe powerpack.d. Push the hydraulic hoses to the side and lookinto the access opening.You will see the rear bottom side of the engine’sflywheel cover as well as a 2’’ by 3’’ opening onthe flywheel cover in the six o’clock location.e. On a sharp angle through this opening, you willsee the back side of the flywheel, as well as theclearance holes on the flywheel but through theopening you can only see one hole at a time.f. Looking at the clearance holes, you can also seethe studs and locking nuts that hold the splinedrive ring in place. The spline drive ring studsand nuts are designed to protrude into theflywheel’s clearance holes and clear theflywheel’s holes by approximately 1/4’’.g. As in the audio method, use the 3/8’’ bolts andthe breaker bar to detect any backlash. Turn theengine manually to position one of theflywheel’s clearance holes in the center of theflywheel’s cover opening for visual accessibility.h. As the person in the crew compartment movesthe engine, the person under the vehicle lookinginto the access hole will be able to detect one ofthe following two relative movements on thespline drive coupling.1) When the spline drive coupling is in goodcondition, you can only detect unitmovements because the clearance betweenthe mating spline teeth is just a fewthousandths of an inch.0155 00-172
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