TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 145 of 1176
TM 9-2320-361-24-1
0008 00
0008 00-17
MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. FUEL INJECTORS
DELIVER EXCESS FUEL
INTO ENGINE
1. Check fuel injection pump return
line.
2. Check fuel injection pump timing
to engine (WP 0069 00).
3. Check fuel injection internal
timing (WP 0008 00, table 2,
malfunction 2, step 3.
4. Check fuel injector nozzle
operation (WP 0008 00, table 2,
malfunction 1, step 2.)
5. See WP 0008 00, table 1,
malfunction 3, step 3.
If fuel return line is bent, kinked, or
restricted, replace fuel return line
(WP 0062 00).
If fuel injection timing to engine is
incorrect, adjust to specifications
(WP 0069 00).
Replace defective components as
needed.
Replace fuel injection pump if
necessary (WP 0069 00).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
• Hot coolant is under pressure. Care should be used when removing radiator filler cap or inspecting
hot engine coolant leaks. Steam or hot coolant under pressure may cause severe injury to
personnel.
• Wear hand protection at all times when working with heated parts. Failure to do so may result in
injury to personnel.
1. COOLANT LOSS
DURING NORMAL
OPERATION
Flow test warm engine cooling
system (TM 750-254). Observe flow
test reading.
1. If flow test reading declines and
there are no indications of
external leaks, coolant is leaking
internally into engine or
combustion chambers. Remove oil
dipstick and check engine oil for
presence of coolant.
2. If coolant is present on oil
dipstick, replace engine
(WP 0046 00).
2. COOLANT
TEMPERATURE
EXCESSIVE
Refer to WP 0006 00, table 4,
malfunction 1.
Table 2. Fuel System Troubleshooting Procedures (Contd).
Table 3. Cooling System Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. VEHICLE WILL NOT
MOVE OR ENGINE
STALLS WITH CLUTCH
ENGAGED
1. Check transmission condition.
Place transfer case in neutral and
transmission in first gear. Engage
clutch and observe transmission
to transfer propeller shaft for
evidence of rotation.
1. If engine stalls, disconnect
transmission to transfer case
propeller shaft for evidence of
rotation.
2. Place transmission in neutral. If
transmission will not turn, replace
(WP 0131 00 and WP 0132 00) or
repair transmission (WP 0450 00).
Table 4. Clutch System Troubleshooting Procedures.
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