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 TM 55-1905-223-24-1
(5) Other Possible Causes of Engine Noise.
(a) Gear train whine.
1 Excessive gear backlash.
2 Insufficient oil supply.
3 Worn gears.
(b) Bearing failure in the turbocharger, water pump, or fuel pump.
(c) Loose or damaged engine mounts.
(d) Vibrating tubing or hoses due to loose, damaged or missing mounting hardware.
2-12. Troubleshooting . Both a symptom index and a troubleshooting table are provided. The symptom
index will help you locate the information you need for troubleshooting.
SYMPTOM INDEX
Troubleshooting
Procedure
COOLANT
Temperature Above Normal
Item 1
Temperature Below Normal
Item 2
Contains Lube Oil
Item 10
COOLANT LOSS
External
Item 4
Internal
Item 5
Overflow
Item 3
ENGINE
Crankcase Gases Excessive
Item 24
Cranking; Won't Start
Item 12
Hard to Start
Item 13
Runs Rough
Item 17
Start; Won't Keep Running
Item 14
Surges
Item 15
Vibration Excessive
Item 31
Won't Reach Rated Speed
Item 21
Won't Shut Down
Item 20
Won't Start
Item 13
2-21
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