TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-37
Engine Noise Excessive -- Combustion Knocks
This is symptom tree T048.
Cause
Correction
Repair or replace the ether starting aids. Refer
Ether starting aid is malfunctioning
.......
to the manufacturer's instructions.
OK
F
Operate the engine from a tank of high-quality
fuel. Refer to the Operation and Maintenance
uel grade is not correct for the application, or
.......
Manual, B Series Engines, Bulletin No.
the fuel quality is poor
3810205.
OK
A
Check for air in the fuel system. Bleed air from
ir in the fuel system
.......
the system. Refer to Procedure 006-024.
OK
C
Check the coolant level. Refer to Procedure
oolant temperature is above specification
.......
008-018.
OK
I
Perform the automated cylinder performance
test. Replace injectors as necessary. Refer to
njector is malfunctioning
.......
Procedure 006-026.
OK
O
Measure and adjust the overhead settings.
verhead adjustments are not correct
.......
Refer to Procedure 003-004.
L-621