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ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 Table 3-2.  Troubleshooting  Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 13.  ABNORMAL ENGINE NOISE. Step 1.  Check for worn tappets. a.  Inspect tappets for wear.  Refer to paragraph 3-27.  If not worn, do Step 2. b.  Replace worn tappets.  Refer to paragraph 3-27. Step 2.  Check for bent pushrods. a.  Replace bent pushrods.  Refer to paragraph 3-26. b.  Inspect pushrods for straightness.  Refer to paragraph 3-26.  If straight, repair or replace engine. 14.  DETONATION OR PRE-IGNITION. Step 1.  Check for defective fuel injectors. a.  Remove and test fuel injectors.  Refer to paragraph 3-17.  If not defective, do Step 2. b.  Replace fuel injectors.  Refer to paragraph 3-17. Step 2.  Check for improper fuel pump timing. Adjust fuel pump timing.  Refer to paragraph 3-14.  If timing is correct, do Step 3. Step 3.  Check for carbon buildup in compression chambers. a.  Remove cylinder head and inspect for carbon buildup.  Refer to paragraph 3-27. b.  Remove carbon and/or replace components as necessary. 3-7


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