Quantcast 2-7.  TROUBLESHOOTING SYMPTOM INDEX

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TM 9-2815-225-34&P 2-7.  TROUBLESHOOTING SYMPTOM INDEX TROUBLESHOOTING MALFUNCTION MALFUNCTION PROCEDURE NO. PAGE 1. Engine will not crank  .......................................................................................... 2-3 2. Engine cranks but fails to start  ........................................................................... 2-3 3. Engine starting motor operates but does not engage ring gear  ............................ 2-4 4. Engine stops  ..................................................................................................... 2-4 5. Engine fails to stop  ............................................................................................ 2-4 6. Engine overheats ............................................................................................... 2-4 7. Excessive exhaust smoke  .................................................................................. 2-4 8. Low oil pressure  ................................................................................................ 2-5 9. Engine knocks  ................................................................................................... 2-5 10. Excessive fuel consumption  ............................................................................... 2-5 11. Excessive oil consumption  ................................................................................. 2-5 12. Excessive engine vibration ................................................................................. 2-7 13. Engine will not idle  ............................................................................................. 2-7 14. Fuel leaks at pump or injector  ............................................................................ 2-8 15. Engine does not develop full power  .................................................................... 2-8 16. Engine misses or runs erratically  ........................................................................ 2-8 17. Excessive gear noise  ......................................................................................... 2-9 18. Excessive oil loss  .............................................................................................. 2-9 19. Sludge formation in crankcase  ........................................................................... 2-9 20. Lubricating oil diluted  ......................................................................................... 2-9 21. Low compression ............................................................................................... 2-10 22. Engine overspeed .............................................................................................. 2-10 NOTE For further engine troubleshooting information, refer to the Cummins Troubleshooting and Repair Manual, NT 855 Engine, Bulletin No. 3810298-00. 2-8.  MECHANICAL TROUBLESHOOTING Table 2-1.  Mechanical Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1.   ENGINE WILL NOT CRANK Step 1.   Remove rocker covers, and rotate engine by attaching a socket and breaker bar to accessory drive nut.  Check for bent pushrod(s), and valve(s) not opening or closing. If   valve(s)   fail   to   open   or   close,   manually   open   valve   with   3/4-in.   wrench.      If   valve(s)   are   seized,   remove corresponding cylinder head (para. 3-24). Step 2.   Test for mechanical or hydraulic seizure.  Remove the fuel injectors (para. 3-23).  Turn the engine over several times to displace the liquid from cylinders through the injector openings. If engine can be turned freely after all liquids have been displaced, install the injectors.  If the engine cannot be turned over freely by hand, disassemble the engine and replace the defective parts. 2.   ENGINE CRANKS BUT FAILS TO START Step 1.   Test for broken fuel supply pump driveshaft. Replace the injectors (paras. 3-23 and 3-82). 2-3


 


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