TM 9-2815-225-34&P Table 2-1.  Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 4.   Check for broken fuel injector plunger spring. Replace fuel injector plunger spring (para. 3-52). Step 5.   Check for broken or deformed injector cup. Replace injector cup (para. 3-52). Step 6.   Check for plugged injector cup spray holes. Clean injector cups (para. 3-52). Step 7.   Check for plugged metering or drain orifice in fuel injectors. Clean fuel injectors (para. 3-52). Step 8.   Check for burned or excessively pitted valves. Reface or replace valves and valve seat inserts (para. 3-35). Step 9.   Check for cracked or broken valve seat inserts. Replace damaged valve seat inserts (para. 3-35). Step 10.     Check for incorrect injection timing. Adjust injection system timing (para. 3-72). Step 11.     Check for leaking injector sleeves. Replace injector sleeves (para. 3-53). 17.   EXCESSIVE GEAR NOISE Step 1.   Check for broken or worn gear teeth. Replace gears or units having damaged teeth (refer to index for appropriate paragraphs). Step 2.   Check for excessive gear backlash. Replace defective gears or shafts (refer to index for appropriate paragraphs). 18.   EXCESSIVE OIL LOSS Step 1.   Check for cracked or broken front gearcase cover. Replace front gearcase cover (paras. 3-27 and 3-75). Step 2.   Check for defective seals and gaskets. Replace faulty seals and gaskets as required. Step 3.   Check for leaking rear cover oil seal or gaskets. Replace rear cover oil seal or gaskets (paras. 3-25 and 3-80). 19.   SLUDGE FORMATION IN CRANKCASE Check for moisture in crankcase. Isolate the source and repair as required. Inspect for tears on head gaskets cylinder openings. 20.   LUBRICATING OIL DILUTED Step 1.   Check for moisture in crankcase. Isolate the source and repair as required. Inspect for tears at head gaskets cylinder openings. Step 2.   Check injector for damaged O-ring. Replace injector O-ring (para. 3-52). 2-9