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Direct Support Mechanical Troubleshooting - continued - TM-9-2320-386-24-1-20028
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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-9-2320-386-24-1-20030
TM 9-2320-386-24-1-2
0293 00
Direct Support Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Check for restricted fuel/water separator.
a. Disconnect fuel line from rear of cylinder head and crank engine.
b. If no fuel is present, replace fuel filter (WP 0054 00).
c. Crank engine. If no fuel is present, fuel/water separator is defective. Replace fuel/water
separator (WP 0053 00).
Step 4. Check transfer pump for proper operation.
a. Loosen transfer pump-to-fuel/water separator fuel line and crank engine.
b. If no fuel is present, remove transfer pump (WP 0324 00) and check for damage to
transfer pump and cam lobe. If damaged, replace governor (WP 0326 00).
c. If fuel is present, perform step 5.
Step 5. Replace fuel injector (WP 0319 00).
END OF TESTING!
17. LOW FUEL SUPPLY AT FUEL INJECTORS
Perform malfunction 16.
END OF TESTING!
18. FUEL INJECTORS INOPERATIVE
Step 1. Perform malfunction 16.
Step 2. Perform malfunction 3, steps 1 and 2.
END OF TESTING!
19. FUEL INJECTORS DELIVER EXCESS FUEL INTO ENGINE
WARNING
Compressed air source will not exceed 30 psi (207 kPa).
Eyeshields must be worn at all times. Failure to do so may
result in injury to personnel.
Step 1.
Check fuel return line for restrictions.
a. Disconnect fuel return line from governor (WP 0051 00).
b. Apply air pressure to fuel return line.
c. Replace fuel return line if restricted (WP 0048 00).
Step 2.
Fuel setting is too high.
Adjust fuel setting as necessary (WP 0323 00).
Step 3.
Perform malfunctions 7 and 14 if there is evidence of abnormal noise or misfiring of engine.
Step 4.
Check fuel injection timing (WP 0322 00).
Adjust timing as necessary (WP 0322 00).
Step 5.
Check for leaking O-rings and defective fuel injectors.
a. Disconnect fuel line from rear of cylinder head.
b. Apply air pressure to cylinder head. If air is heard leaking at fuel injector(s), remove fuel
injector(s) (WP 0319 00) and replace O-rings.
Step 6.
Replace fuel injectors (WP 0319 00).
END OF TESTING!

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