TM 5-3805-262-342-4.ENGINETROUBLESHOOTING(CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION11. DIAL INDICATOR HAND DOES NOT INDICATE 0.053 INCH WHEN PERFORMING VALVE TIMINGCHECK (PAGE 3-8) (Cont).Step 6.Check backlash between idlerdrive gear and idler gear usingdial indicator at idler gear.Backlash should be 0.003 to 0.010inch.a. If backlash exceeds 0.010inch, replace idler drive gearor drive gear (page 4-54).b. If backlash is 0.003 to 0.010inch, check for worn valvelifters (page 4-61), worn ordamaged cam lobes on camshaft(page 4-61) , worn camshaftbushings (page 4-59) or wornvalve lifter bores in cylinderblock (page 4-61).12. COMPRESSION OF ONE OR MORE CYLINDERS IS LESS THAN SPECIFIED WHEN PERFORMINGCYLINDER COMPRESSION CHECK (PAGE 3-12).Step 1.Put a small amount of oil in cylinder and repeatcheck (page 3-12).a. If compression check readings are now normal,rings (page 4-42).engine compressionreplace pistonb. If compression check readings are still low, go to step 2 below.Step 2.Check valve timing (page 3-8).a.b.If valve timing is not okay as indicated by dial indicator handnot indicating 0.053 inch, go to Malfunction 11 above (page2-41 ) .If valve timing is okay as indicated by dial indicator hand in-dicating 0.053 inch, compression leakage is either past valvesor a damaged cylinder head gasket. Remove cylinder head (page3-45) associated with bad cylinder and check gasket. If cylinderhead gasket is okay, remove and replace valves (page 3-74).2-43
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business