TM 10-3930-641-34-1
SYMPTOMS INDEX
(Sheet 1 of 4)
Troubleshooting
Procedure
Page
ENGINE
Alternator has low or irregular discharge............................................................................................................................................................. 2-22
Alternator discharge rate too high ....................................................................................................................................................................... 2-22
Alternator is noisy ................................................................................................................................................................................................ 2-23
Alternator does not charge .................................................................................................................................................................................. 2-21
Black or gray smoke from exhaust ...................................................................................................................................................................... 2-17
Coolant in lube oil ................................................................................................................................................................................................ 2-17
Doesn't develop full power .................................................................................................................................................................................. 2-12
Engine noise (mechanical noise) ........................................................................................................................................................................ 2-14
Fuel use - sudden large increase ........................................................................................................................................................................ 2-15
Hard to start......................................................................................................................................................................................................... 2-9
Hot, dense smoke (high exhaust temperature) ................................................................................................................................................... 2-23
Hunts (changes speed suddenly by itself)........................................................................................................................................................... 2-11
Knocks (loud combustion noise) ......................................................................................................................................................................... 2-13
Low engine oil pressure....................................................................................................................................................................................... 2-19
Low rpm (engine will not turn higher than 1000 to 1200 rpms) ........................................................................................................................... 2-10
Misfires or runs rough.......................................................................................................................................................................................... 2-10
Oil at exhaust ...................................................................................................................................................................................................... 2-16
Oil in cooling system............................................................................................................................................................................................ 2-15
Overheats ............................................................................................................................................................................................................ 2-20
Stalls at low rpm .................................................................................................................................................................................................. 2-11
Starting motor doesn't turn over .......................................................................................................................................................................... 2-21
Unusual engine vibrations ................................................................................................................................................................................... 2-13
Valve noise (loud clicking noise from valve compartment) ................................................................................................................................. 2-14
Valve clearance greater than specification.......................................................................................................................................................... 2-24
Valve clearance less than specification............................................................................................................................................................... 2-25
White or blue smoke from exhaust (engine using excessive lube oil) ................................................................................................................ 2-18
Will not crank when power switch is on START .................................................................................................................................................. 2-8
Go on to Sheet 2
2-4