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Page Title: Table 4-1. General Support Maintenance Troubleshooting
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TM 5-4320-306-24 Table 4-1.  General Support Maintenance Troubleshooting MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1.  ENGINE IS HARD TO START Step 1.  Check for sticking or burned exhaust valves.  Inspect valves. Repair or replace faulty valves (para 4-7). Step 2.  Check for broken or worn piston rings  Inspect pistons and rings.  Inspect cylinder head assembly Repair or replace pistons (para 4-10) and cylinder head assembly (para 4-6 or 3-19).  Replace piston rings (para 4-10). Step 3.  Check for improper exhaust valve clearance. Check and adjust exhaust valve clearance (para 4-7). 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 head assembly Repair or replace faulty pistons (para 4-10) and cylinder head assembly (para 4-6 or 3-19) Replace piston rings (para 4-10). Step 2    Check for scored cylinders or pistons Inspect cylinders and pistons. Repair or replace faulty cylinder head assembly (para 4-6 or 3-19) and piston (para 4-10) Step 3    Check for loose piston pin circips.  Inspect piston pin circips. Replace a loose piston pin circip (para 4-10). Step 4.  Check for piston and connecting rod alinement Inspect pistons and connecting rods Check crankshaft thrust surfaces for wear or grooving. Replace a faulty piston (para 4-10) or connecting rod (para 4-11).  If necessary, replace crankshaft (4-12) 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 4-10) 4.  ENGINE HAS LOW OIL PRESSURE Step 1.  Check for excessive wear on crankshaft bearing journals or main bearings  Inspect crankshaft and main bearings. Replace faulty crankshaft or main bearings, if necessary (para 4-12 and 4-13). 4-3

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