TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 114 of 1207
TM 9-2320-361-20
Table 2-2. Mechanical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Turn accessory switch to ON position and drain 1/2 pint (0.25 liter) of fuel from primary
fuel filter, secondary fuel filter, and final fuel filter. Check for contaminated fuel.
If water or contamination are present, remove fuel tank (chapter 3, section VI). Clean and
flush entire fuel system. Dry system with compressed air.
Step 4. Check for white exhaust smoke during cranking.
a. If white smoke can be seen, air maybe in fuel system. Bleed fuel system (para. 3-29).
b. If white smoke can be seen, coolant maybe inside combustion chambers. If coolant is
present on dipstick, notify your supervisor.
Step 5. Check in-tank pump pressure (para. 3-26). If pressure is below 4 psi (27.58 kPa), replace in-
tank fuel pump (para. 3-26).
Step 6. Turn accessory switch to ON position and check pressure at secondary and final fuel filters
(para. 3-29).
a.
b.
If pressure is below 2 psi (14.00 kPa), remove and replace primary fuel filter (para. 3-28)
and recheck pressure at secondary and final fuel filters. If pressure is still below 2 psi
(14.00 kpa), replace secondary and final fuel filters (para. 3-29).
If filters are clean and pressure is still below 2 psi (14.00 kPa) at secondary and final
fuel filter, inspect fuel lines for kinks, bends, breaks, loose connections, restrictions, and
leaks. Repair fuel lines if damaged.
END OF TESTING!
3. STARTER CRANKS ENGINE SLOWLY
Step 1. Check starting system circuits (table 2-4, malfunction 3).
Step 2. In cold weather, make sure proper engine oil is being used and /or replace oil
(LO 9-2320-209-12-1).
Step 3. Check water pump and belt driven accessories for seizing (malfunction 1, step 4).
END OF TESTING!
4. ENGINE STOPS DURING NORMAL OPERATION
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Check air cleaner for restrictions (malfunction 2, step 2).
Check fuel system for contamination and restrictions (malfunction 2, step 3 and
malfunction 21).
Check for restrictions in exhaust system. Ensure exhaust is not bent, restricted, or
damaged.
If exhaust system is damaged or restricted, replace damaged parts (para. 3-37).
Check air induction system for major restrictions.
If air induction system is restricted, clean or replace defective components (Chapter 3,
section IV).
Check governor idle speed (para. 8-29).
If governor idle speed is set below specifications, adjust (para. 8-29).
END OF TESTING!
2-29
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