TM 5-4320-300-14Table 6-1. General Support Maintenance Troubleshooting - ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 4. Check for piston and rod alignment. Inspect pistons and connecting rods (para 6-10). Check crankshaftthrust surfaces and thrust washers for wear or grooving (para 6-11).Replace a faulty piston or connecting rod (para 6-10). If necessary, regrind and polish crankshaftand install oversize thrust washers (para 6-11).3. ENGINE PRODUCES EXCESSIVE CRANKCASE PRESSUREStep 1. Check for worn piston rings, a hole or crack in a piston crown, worn blower oil seals, defective blower, orexcessive exhaust back pressure.Replace worn or damaged parts (para 6-4 and 6110).4. ENGINE HAS LOW OIL PRESSUREStep 1.Check for clogged oil cooler core. Inspect oil cooler core (para 6-4).Replace a clogged or otherwise faulty oil cooler core (para 6-4).Step 2.Check for malfunctioning oil cooler bypass valve or pressure regulator valve. Inspect valves (para6-6).Repair or replace faulty valves (para 6-6).Step 3.Check for partially clogged oil pump inlet screen. Inspect oil pump inlet screen (para 6-6).Replace a screen that is damaged or cannot be cleaned adequately (para 6-6).Step 4.Check for air leak in oil pump inlet pipe and screen assembly. Inspect oil pump inlet pipe and screenassembly (para 6-6).Repair or replace a faulty oil pump inlet pipe and screen assembly (para 6-6).Step 5.Check for worn or damaged oil pump. Inspect oil pump (para 6-6).Repair or replace a faulty oil pump (para 6-6).Step 6.Check for missing crankshaft oil plugs, or excessive wear on crankshaft main bearing journals orbearings. Inspect crankshaft (para 6-11). Inspect main bearings (para 6-12).Replace missing crankshaft plugs. Regrind or replace faulty crankshaft (para 6-11). Replace mainbearings, if necessary (para 6-12).Step 7.Check for missing camshaft plugs. Inspect camshaft (para 6-9). Replace missing camshaft plugs(para 6-9).6-4
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