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Direct Support Mechanical Troubleshooting - continued - TM-9-2320-386-24-1-20025
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/.5ton/TM-9-2320-386-24-1-2 Extended Service Program (ESP) for 2-1/2-Ton 6x6 M44A3 Series Trucks (Diesel) Manual
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Direct Support Mechanical Troubleshooting - continued - TM-9-2320-386-24-1-20027
TM 9-2320-386-24-1-2
0293 00
Direct Support Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. ENGINE DELIVERS EXCESSIVE BLACK SMOKE
Perform malfunction 19.
END OF TESTING!
7. ENGINE SURGES OR MISFIRES DURING OPERATION
Step 1. Perform malfunction 3.
Step 2. If malfunction continues, replace engine (WP 0295 00).
END OF TESTING!
8. ENGINE STOPS DURING NORMAL OPERATION
Step 1. Start engine (TM 9-2320-386-10) and check operation.
If engine runs rough, misfires, or does not start, perform malfunction 2.
Step 2. Perform malfunction 1, steps 1 through 3.
Step 3. Perform malfunction 3.
END OF TESTING!
9. EXHAUST COLOR BLUE DURING NORMAL OPERATION
NOTE
Blue exhaust indicates presence of excessive engine oil in cylinder
combustion chamber.
Step 1. Check for failure of turbocharger oil seal.
Remove charged-air cooler tubes (WP 0073 00) and check for presence of oil. If oil is
present, replace turbocharger (WP 0325 00).
Step 2. Check intake and exhaust valve adjustment (WP 0311 00).
Step 3. Perform malfunction 3, step 5.
END OF TESTING!
10. EXHAUST COLOR WHITE DURING NORMAL OPERATION
CAUTION
Thick white exhaust indicates coolant is present in engine
combustion chambers during operation. When this condition is
evident, shut down engine immediately and determine cause.
Continued engine operation may result in permanent engine
damage.
Step 1. Perform cooling system pressure test (TM 750-254).
a. If test does not indicate a leak in cooling system, perform malfunction 2.
b. If test indicates a leak is present in cooling system, perform step 2.
Step 2. Replace fuel injectors (WP 0319 00).
If condition continues, perform step 3.
Step 3. Check engine oil for presence of coolant.
a. If coolant is present, remove cylinder head (WP 0302 00). Inspect cylinder head, head
gasket, and engine block for cracks. Replace cylinder head if cracked (WP 0302 00).
Replace engine if engine block is cracked (WP 0295 00).

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