TM 5-3805-262-342-4. ENGINE TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION4. ENGINE MISFIRES (Cont).Step 12. Remove five capscrews securing gear cover and gasket to timing gearStep 13.cover.Discard gasket.Check fuel injection pump drive gear to idler gear backlash usingdial indicator.Backlash should be 0.012 inch.a. If backlash exceeds 0.012 inch, replace fuel injection pumpdrive gear (page 3-136).Recheck backlash. If backlash still exceeds 0.012 inch, replaceidler gear (page 4-54).Perform fuel injection pump governor adjustments (page 3-14).b.If backlash does not exceed 0.012 inch, go to Malfunction 1,page 2-47.Remove cylinder head assemblies (page 3-45).Remove valve locks, valve retainers, and springs (page 3-74).Check for bent valves or worn or broken valve spring (page 3-76).a.b.c.If a valve is3-74) .If valves andstalled valvebent or a valve spring broken, replace (pagevalve springs are okay, check for incorrectly in-guide (page 4-12).If valve guides are okay, check for a bent connecting rod. Dothis by cranking engine until piston is at top dead center.Measure height of piston between top of piston to top of cylin-der sleeve. Repeat for remaining pistons. A difference of 0.020inch will indicate a bent connecting rod. Notify general supportmaintenance to replace bent connecting rods (page 4-42).2-20
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