TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 2 Download
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TM 9-2320-387-24-2 Table 14-I. Mechanical lhubleshooting (Cont’d). MALFUNCTION TEST OR INSPECTION 9. ACCELERATOR PEDAL STICKS OR FULL THROTM CANNOT BE OBTAINED Disconnect accelerator cable from fuel injection pump. Move throttle lever on injection pump to wide open throttle. If throttle lever does not move freely, replace injection pump (para. 16-6). END OF TESTING! 10. LEAKING EXHAUST GASES OR EXHAUST NOISES Check for leaking exhaust gases around exhaust manifolds. Replace any leaking exhaust manifold gaskets or exhaust manifolds (para. 3-57). END OF TESTING! 11. LOSS OF COOLANT step 1. Pressurize coolant system and check for leaks at water pump and around cylinder heads. If any leakage is present, replace cylinder head gaskets, cylinder heads (para. 15-4 or 15-51, or water pump (para. 3-78). step 2. Check cylinder block for cracks. Replace engine (para. 15-26) if cylinder block is cracked. END OF TESTING! 12. ENGINE OVERHEATS Step 1. Check for leaking or defective water pump. Replace leaking or defective water pump (para. 3-78). Step 2. Remove surge tank cap (TM 9-2320-387-10). With engine running, check for excessive bubbles in surge tank that may indicate leaking head gaskets or cracked cylinder heads. If bubbles are present, remove cylinder heads (paras. 15-4 and 15-5) and check for defective head gaskets, cracked cylinder heads, or cracked cylinder block. Replace cylinder heads (paras. 15-4 and 15-5) if damaged. Replace engine (para. 15-26) if cylinder block is cracked. END OF TESTING! 13. ENGINE DOES NOT DEVELOP FULL POWER step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Step 7. Remove and test fuel injection nozzles. Replace worn fuel injection nozzles (para. 16-3). Check for worn or damaged fuel injection pump. Replace worn or damaged fuel injection pump (para. 16-6). Perform step 3 of malfunction 2. Check for damaged lifters. Replace damaged lifters (TM 9-2815-237-34). Check for damaged camshaft. Replace damaged camshaft (TM 9-2815-237-34). Check for burned valves. Replace burned valves (TM 9-2815-237-34). Check for worn or damaged pistons and piston rings. Replace worn or damaged pistons and piston rings (TM 9-2815-237-34). END OF TESTING! 14-6