TM-9-2320-361-34

2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

MAY 1992
TM-9-2320-361-34

  TM-9-2320-361-34 - Page 23 of 764

TM9-2320-361-34
Table 2-1. Mechanical Troubleshooting (Contd).
I
MALFUNCTION
TEST OR INSPECTION
4.
ENGINE STARTS BUT STOPS WHEN ACCELERATOR IS OPERATED
Step 1. Check fuel leakage at inlet side of fuel supply pump (mounted on fuel injection pump)
(malfunction 18, step 4).
Step 2. Check fuel delivery systems (malfunction 18).
END OF TESTING!
5.
ENGINE STOPS WHEN ACCELERATOR IS RETURNED TO IDLE POSITION
Check fuel delivery systems (malfunction 18).
END OF TESTING!
6.
POOR ACCELERATION AND/OR LACK OF POWER
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6,
Step 7.
Check vehicle clutch system for slippage (malfunction 25).
Perform fuel delivery malfunction 18, steps 1,2, and 3.
Check fuel injection pump timing is set within engine specifications (para. 5-4).
If fuel injection pump timing is incorrect, adjust (para. 5-4).
Check turbocharger operation. Remove plug from top of inlet manifold. Install low pressure
gage with adapter into plug opening. Start engine and accelerate engine to fill throttle and
immediately decelerate. Observe pressure gage readings.
If no gage movement or only a small pressure increase by gage is evident, replace defective
turbocharger (para. 5-6).
Check turbocharger outlet hose, intake manifold elbow, and gasket for leaks
(para. 5-6).
Tighten base screws and clamps. Replace any missing screws or clamps
(TM 9-2320-361-20).
If no improvement during test run, remove and inspect turbocharger hoses, intake
manifold elbow, and gasket for defects (para. 5-6). Replace defective components (para. 5-6
and TM 9-2320-361-20).
Check engine valve train operation and valve lash adjustment (malfunction 3, step 2).
Check engine cylinder compression (malfunction 11, steps 1 and 2).
END OF TESTING!
7.
ENGINE DELIVERS EXCESSIVE BLACK EXHAUST SMOKE
Complete troubleshooting malfunction 21.
END OF TESTING!
8. ENGINE SURGES
Step 1. Check fuel supply pump (mounted on fuel injection pump) operation (malfunction 18,
step
4).
Step
2.
Check fuel injector nozzles operation (malfunction 18, step 2).
Step 3. Check fuel shutoff system for correct operation and adjustment (malfunction 18, step 1).
END OF TESTING!
2-8


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