TM 5-3805-262-342-4. ENGINE TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION5. ENGINE NOISY (Cont).Step 7. (Cont).b. Check cylinder sleeves for ridge (page 4-43). If ridge is pre-sent, remove (page 4-43).c. If foreign material is not seen in cylinders, go to step 8 be-low.Step 8. Crank engine until piston is at top dead center.Measure height of piston between top of piston to top of cylindersleeve. Repeat for remaining pistons.a. A difference of 0.020 inch will indicate a bent connecting rod.Notify general support maintenance to replace bent connectingrods (page 4-42).b.If connecting rods are okay, go to step 9 below.Step 9.Remove timing gear cover (page4-67) .Check end clearance of idlergear. Measure between thrustplate and idler gear as shown.End clearance should be not morethan 0.010 inch.a. If end clearance is more than0.010 inch, replace thrust wa-sher, thrust plate, or idlergear in any combination ofparts necessary to obtain0.010 inch or less end clear-ance.b. If end clearance is 0.010 inch or less, check for broken ormissing thrust spring (page 4-55). Replace as necessary.c. If all above parts are okay, check for a loose camshaft gear orworn camshaft thrust washer (page 4-61).2-24
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