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 TM 55-1905-223-24-1
Table 2-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
15. Engine Surges.
STEP 1.
Check for air in fuel system.
Bleed fuel lines, tighten fuel connections, tighten filter.
STEP 2.
Check if engine idle speed set low.
Adjust low idle screw.
STEP 3.
Check for fuel drain line restriction.
Check lines and tank vents.
STEP 4.
Check if throttle linkage set incorrectly.
Set linkage to proper position.
STEP 5.
Fuel pump calibrated incorrectly.
Replace fuel pump. Refer to para. 2-29.
STEP 6.
Check if injector levers out of adjustment.
Adjust injector levers. Refer to para. 2-30.
16. Idle-Rough.
STEP 1.
Check for low idle speed on tachometer.
STEP 2.
Check for air in fuel.
Bleed fuel lines, tighten lines, fittings, and filter.
STEP 3.
Check if injector lever adjustment incorrect.
Adjust injector lever. Refer to para. 2-30.
STEP 4.
Check for defective injectors.
Replace injectors. Refer to para. 2-31.
STEP 5.
Check for loose engine mounts.
Tighten to 270 ft-lb (365 N ).
m
17. Engine runs rough or misfires in operating range (warm engine).
STEP 1.
Check for air in fuel.
Bleed air from fuel lines, tighten fuel connections, tighten filter.
STEP 2.
Check for poor fuel quality. Take fuel sample if necessary.
Drain and clean fuel tanks. Replenish fuel.
STEP 3.
Check if valve or injectors rockers adjusted incorrectly.
Check valve and injector settings. Refer to para. 2-30.
STEP 4.
Inspect if rocker lever broken.
Replace rocker levers. Refer to para 2-30.
2-28
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