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 TM 55-1905-223-24-3
Table 2-2. Troubleshooting-Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
STEP 5. Check valve timing.
Adjust timing (para. 2-40).
21. Rough idle.
STEP 1. Check if engine idle speed is low.
Check and adjust low idle speed (para. 2-10).
STEP 2. Check for air in fuel.
Refer to Malfunction 18, Step 5.
STEP 3. Check for defective injector.
Refer to Malfunction 20, Step 3.
STEP 4. Check for defective fuel pump.
Refer to Malfunction 17, Steps 5 and 8.
STEP 5. Check for defective engine mounts.
Check engine mounts and capscrews for cracks or other defects. Replace as necessary. Secure capscrews to
135 ft-lb.
STEP 6. Check injector timing/adjustment valves worn or damaged, etc.
Adjust or repair as required.
22. Engine surges at low idle.
STEP 1. Check for air in fuel system.
Refer to Malfunction 18, Step 5.
STEP 2. Check if engine idle speed is too low.
Refer to Malfunction 13, Step 1.
STEP 3. Check for fuel return restriction.
a. Disconnect fuel return line and install a vacuum gauge between the line and the fuel pump return fitting.
(1) Use hose adapters to connect gauge.
(2) Maximum reading should be 6.5 in. Hg (16.5 cm Hg) with check valves.
b. If restriction is above maximum, check lines or tank vents for obstructions.
23. Engine will not reach rated speed when under a load.
STEP 1. Check for clogged fuel filters.
Replace filters (PMCS Item 13).
2-41
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