TM 10-4320-318-14Table 4-2. Troubleshooting ProceduresMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ENGINE DOES NOT START.Step 1. Check to see if fuel lines are damaged or leaking.Replace damaged fuel lines (para. 4-23).Step 2. Check for clogged fuel filter.Replace fuel filter (para. 4-23).Step 3. Check venting device for proper operation.Remove venting valve and check for freemovement of internal valve ball.If necessary, clean or replace venting valve (para. 4-23).2. ENGINE IS HARD TO TURN.Step 1. Check valve tappet clearance.If necessary, adjust valve tappets (para. 4-30).Step 2. Check adjustment of decompression device.If necessary, adjust decompression device (para. 4-30).3. BLACK SMOKE FROM EXHAUST (ENGINE MAY LACK POWER, INDICATED BY DROPPING SPEED.Step 1. Check tappet clearance.If necessary, adjust tappet clearance (para. 4-30).Step 2. Check for faulty or leaky injection nozzle.Replace injection nozzle if necessary (para. 4-26).4. ENGINE LACKS POWER (NO SMOKE FROM EXHAUST).Step 1. Check for clogged fuel filter.Replace fuel filter (para. 4-23).Step 2. Check venting device for proper operation.Remove venting valve and check for freemovement of internal ball valve.If necessary, clean or replace venting valve (para. 4-23).4-6
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