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Direct Support Mechanical Troubleshooting - continued - TM-9-2320-386-24-1-20027
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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-9-2320-386-24-1-20029
TM 9-2320-386-24-1-2
0293 00
Direct Support Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
c. Replace engine (WP 0295 00).
Step 3. A knocking noise at the sides of engine indicates valve train components may be damaged.
Replace valve train components if damaged (WP 0309 00, WP 0320 00, or WP 0308 00).
Step 4. A noise at the rear of engine indicates flexplate or transmission components may be loose or
damaged.
a. Place transmission in NEUTRAL and start engine (TM 9-2320-386-10) to verify noise is
at transmission.
Replace transmission if noise is at transmission (WP 0335 00).
b. Remove access plate on flywheel housing and check if flexplate or torque converter is
loose. If loose, tighten screws (WP 0335 00).
c. Remove transmission (WP 0335 00) and check if flexplate is damaged or loose. Tighten
screws if loose. Replace flexplate, if damaged (WP 0337 00).
Step 5. A noise at the bottom of engine indicates flexplate, crankshaft,or connecting rods may be
worn or damaged.
a. Perform step 4, steps b and c.
b. Check crankshaft and connecting rods for excessive wear.
Notify GS maintenance if crankshaft or connecting rods are excessively worn.
c. If malfunction continues, replace engine (WP 0295 00).
END OF TESTING!
15. ENGINE VIBRATION ABNORMAL
Step 1. Check for loose or defective vibration damper (WP 0303 00).
a. Tighten screws if loose.
b. If vibration damper is still loose, replace vibration damper (WP 0303 00).
Step 2. Perform malfunction 3.
If engine vibration continues, notify GS maintenance.
END OF TESTING!
FUEL SYSTEM
WARNING
Diesel fuel is flammable. Do not perform troubleshooting checks
near open flame, sparks, or electricity. Injury to personnel may
result.
Eye protection is required when performing fuel system checks.
Failure to wear eye protection may result in injury to personnel.
16. NO FUEL AT FUEL INJECTORS
Step 1. Prime the fuel system (TM 9-2320-386-10) and attempt to start engine. If engine does not
start, perform step 2.
Step 2. Check fuel supply line for restrictions.
a. Disconnect fuel supply line from governor (WP 0051 00).
b. Apply air pressure to fuel supply line and check for leaks and restrictions. If leaking or
restricted, replace fuel supply line (WP 0051 00).
c. Connect fuel supply line to governor and attempt to restart engine. If engine does not
start, perform step 3.

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