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 TM 55-1905-223-24-5
Table 2-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
STEP 5.
Check injection timing. Adjust timing (para. 2-34).
21. Rough idle.
STEP 1.
Check for low engine idle speed. Adjust low idle speed. Refer to Malfunction 24, STEP
10.
STEP 2.
Check for air in fuel. Refer to Malfunction 18, STEP 5.
STEP 3.
Check for defective injector as follows:
a.
Remove the poppet covers (para. 2-34).
b.
Operate the engine until it is up to 160 (70 ).
F
C
c.
Install Rocker Lever Actuator, P/N ST-1193 on an injector rocker lever.
d.
Hold the injector plunger down while the engine is running at low idle. This will stop the
fuel flow to that injector.
e.
If the engine RPM decreases and/or engine misfires when an injector plunger is held
down, the injector is good.
f.
If the engine RPM does not decrease, replace the defective injector (para. 2-34).
STEP 4.
Check for defective fuel pump. Refer to Malfunction 17, Steps 5 and 8.
STEP 5.
Check valve and injector adjustments. Adjust valves or injectors (pa. 2-34).
STEP 6.
Check injection timing. Adjust timing (para. 2-34).
STEP 7.
Check for defective engine mounts. Refer to PMCS Table 2-3, Item 19.
22. Engine surges at low idle.
STEP 1.
Check for air in fuel system. Refer to Malfunction 18, STEP 5.
STEP 2.
Check for low engine idle speed. Refer to Malfunction 13, STEP 1.
STEP 3.
Check for fuel return line restriction.
a
Disconnect fuel return line and install a vacuum gauge between the line and the fuel
pump return line fitting.
(1)
Use hose adapters to connect gauge.
(2)
Operate the engine at rpm and full load.
Change 2
2-46
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