Engine Noise Excessive - Combustion Knocks
Cause Corrections
----------
Ambient Air Temperature Too Low
OK
f
Check winterfront, under hood air. Refer
to Procedure 1-17.
----------
Ether Starting Aid Malfunctioning
OK
f
Repair or replace ether starting aids.
----------
Fuel Quality Poor
OK
f
Verify by operating from a temporary tank
with good fuel; clean and flush the fuel
supply tanks.
----------
Air in the Fuel System
OK
f
Check for air in the fuel. Tighten the fuel line
connections and fuel filter(s). Check tank
pipe stand. Refer to Procedure 5-16. Check
fuel pump road speed governor (STC only).
Refer to Procedure 5-05.
----------
Injection Timing Too Fast
OK
f
Check injection timing. Refer to
Procedure 7-22.
----------
Injectors Malfunctioning or Mis-Set
OK
f
Replace/adjust injectors. Refer to
Procedure 7-04.
----------
Coolant Operating Temperature Incorrect
Refer to troubleshooting logic for Low
Coolant Temperature.
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-39
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