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Diesel Engine Troubleshooting Symptoms
39
Excessive Noise
This is symptom tree T-017.
Cause Correction
Belt is squeaking due to insufficient tension or
abnormally high loading
Check and adjust belt tension. Make sure all
the pulleys rotate freely.
OK
Air leakage between the turbocharger and
head
Tighten the clamp between turbocharger and
head. Repair leaks between turbocharger and
head.
OK
Exhaust leaks
Refer to Exhaust Gas is Black troubleshooting
tree.
OK
Turbocharger does not rotate freely
Replace the turbocharger.
OK
Gear train backlash is not adjusted correctly
Adjust the backlash for the gear train.
OK
Idler gear bushing is damaged or missing
Replace the idler gear bushing.
OK
Defective or clogged injection nozzle
Replace the defective or clogged injection
nozzle.
OK
Overhead adjustments are not correct
Measure and adjust the overhead settings.
OK
Overhead components are damaged
Inspect the rocker levers, rocker shafts, and
valves for excessive damage.
OK
(Continued)