TM 5-3805-262-342-4. ENGINE TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION4. ENGINE MISFIRES.Step 1.Inspect cylinder heads forcracks.If cracks in cylinder heads arenot seen, start engine, and oper-ate at 1000 rpm for five minutes.With engine operating at idlespeed, check for engine coolantcoming out of exhaust manifold.a. If cracks in cylinder headsare seen, remove and replacecylinder heads (page 3-45).If engine coolant is comingout of exhaust manifold, go tostep 2 below.b. If cracks in cylinder heads not seen and engine coolant is notcoming out of exhaust manifold, go to step 3 below.Step 2.Remove cylinder heads (page 3-45).Check for a cracked cylinder sleeve. Do this by cranking engineuntil piston in cylinder being checked is at bottom of cylinder.Then visually check cylinder sleeve.Repeat for all six cylinders.a. If a cylinder sleeve is cracked, notify general support mainte-nance.b. If cylinder sleeves areokay, replace cylinderhead (page 3-45) and for-ward to general supportmaintenance for repair(page 4-12).Step 3. Check fuel injector nozzlesfor looseness.a. If fuel injector nozzlesare loose, tighten (page3-113).b. If fuel injector nozzlesare not loose, go to step4 below.2-17
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