TM 10-4320-307-24Table 4-1. General Support Maintenance TroubleshootingMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1.ENGINE IS HARD TO START.Step 1.Check for sticking or burned exhaust valves. Inspect valves.Repair or replace faulty valves (para 4-12).Step 2.Check for broken or worn piston rings. Inspect pistons and rings. Inspect cylinder head assembly.Repair or replace pistons (para 4-16) and cylinder head assembly (para 4-12). Replace piston rings (para4-16).2.ENGINE CONSUMES EXCESSIVE LUBE OIL (MAY PRODUCE BLUE SMOKE).Step 1.Check for worn or broken double-chamfered rings. Inspect pistons and rings. Inspect cylinder headassembly.Repair or replace faulty pistons (para 4-16) and cylinder head assembly (para 4-12). Replace piston rings(para 4-16).Step 2.Check for scored cylinders or pistons. Inspect cylinders and pistons.Repair or replace faulty cylinder head assembly (para 4-12 or 3-36) and piston (para 4-16).Step 3.Check for loose piston pin circlips. Inspect piston pin circlips.Replace a loose piston pin circlip (para 4-16).Step 4.Check for piston and connecting rod alignment. Inspect pistons and connecting rods. Check crankshaftthrust surfaces for wear or grooving.Replace a faulty piston (para 4-16) or connecting rod (para 4-16). If necessary, replace crankshaft (4-17).3.ENGINE PRODUCES EXCESSIVE CRANKCASE PRESSURE.Step 1.Check for worn piston rings, a hole or crack in a piston crown, or excessive exhaust back pressure.Replace worn or damaged parts (para 4-16).4.ENGINE HAS LOW OIL PRESSURE.Step 1.Check for excessive wear on crankshaft bearing journals or main bearings. Inspect crankshaft and mainbearings.Replace faulty crankshaft or main bearings, if necessary (para 4-17).4-2
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