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 Step 6.  Check for defective fuel injection pumps. a.  Test fuel injection pumps.  Refer to paragraph 3-13.3.  If not defective, do Step 7. b.  Replace fuel injection pump(s).  Refer to paragraph 3-13. Step 7.  Check for improper fuel pump timing. Adjust fuel pump timing.  Refer to paragraph 3-14.  If adjusted properly, do Step 8. Step 8.  Weak or broken valve springs. a.  Remove and check valve springs.  Refer to paragraph 3-27. b.  Replace defective valve springs.  Refer to paragraph 3-27. 6.  ENGINE DOES NOT DEVELOP FULL POWER. Step 1.  Check for blocked air intake system. Remove blockage as found.  If no blockage is found, do Step 2. Step 2.  Check for loss in vacuum. a.  Perform vacuum check.  Refer to paragraph 3-5.2. b.  If no loss in vacuum, do Step 3. Step 3.  Engine overheated. Refer to Engine Overheating, Malfunction 7.  If not a problem.  Refer to Malfunction 5. 7.  ENGINE OVERHEATING. Step 1.  Inspect coolant level. a.  Check engine for coolant leaks.  If engine has no leaks, do Step 2. b.  Repair coolant leaks.  Refer to end item maintenance manual. Step 2.  Check for defective thermostat. a.  If thermostat is suspected of being defective, replace thermostat.  Refer to paragraph 3-9. b.  If engine continues to overheat, do Step 3. Step 3.  Check for defective water pump. a.  Remove and check water pump for damage.  Refer to paragraph 3-10.  If not defective, do Step 4. b.  Replace defective water pump.  Refer to paragraph 3-10. Step 4.  Check for improper fuel pump timing. Adjust fuel pump timing Refer to paragraph 3-14. 3-4