TM   10-3930-638-24&P 3-3. ENGINE TROUBLESHOOTING (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION 3. ENGINE STARTS BUT WILL NOT RUN (cont) Step 2. Check for correct valve timing in reference to crankshaft timing marks with dial indicator (para 3-5a(1), step 2). a. If correct valve timing in reference to crankshaft timing marks is not obtained, check for sheared key in cam drive gear or broken cam shaft (notify general support maintenance) (para 4-2g). b. If correct valve timing in reference to crankshaft timing marks is obtained, proceed to step 3. Step 3. Perform compression test of each cylinder (para 3-3, MALFUNCTION 7). If  compression  test  is  satisfactory,  test  fuel  injector  nozzles  before  reinstalling  on  engine  (notify general support maintenance) (para 4-3b). If fuel injector test is satisfactory, proceed to step 4. Step 4. Start engine and listen for excessive valve tappet noise. If excessive valve tappet noise is heard, stop engine and check for bent push rods (para 3-5j). 4. ENGINE MISFIRES Step 1. Remove fuel injectors (para 3-6b) and check for damaged fuel injector nozzle seal. a. If fuel injector nozzle seal is damaged, replace (notify general support maintenance) (para 4-3a). b. If fuel injection seals are okay, proceed to step 2. Step 2. Check for proper fuel injection pump timing (para 3-5a(3)). a. If fuel injection pump timing is not correct, adjust timing (para 3-5a(3)). b. If fuel injection pump timing is okay, proceed to step 3. Step 3. Check for correct valve timing in reference to crankshaft timing marks with dial indicator (para 3-5a(1), step 2). a. If correct valve timing in reference to crankshaft timing marks is not obtained, check for sheared key in cam drive gear or a broken cam shaft (notify general support maintenance) (para 4-2g). b. If correct valve timing in reference to crankshaft timing marks is obtained, proceed to step 4. Step  4.  Perform  compression  test  of  each  cylinder  (para  3-3,  MALFUNCTION  7). If  compression  test  is  satisfactory,  test  fuel  injector  nozzle  before  reinstalling  on  engine  (notify general support maintenance) (para 4-3a). If fuel injector test is satisfactory, proceed to step 5. Step 5. Start engine and listen for excessive valve tappet noise. If excessive valve tappet noise is heard, stop engine and check for bent push rods (para 3-5j). 3 - 3