TM 5-2420-230-24-2
Troubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-64
Section TS - Troubleshooting Symptoms
Fuel Knock
This is symptom tree T091-5.
Cause
Correction
Check for correct operation of cold starting aid.
Refer to the Operation and Maintenance
Starting aid is necessary for cold weather, or
.......
Manual, B Series Engines, Bulletin No.
starting aid is malfunctioning
3810205.
OK
C
Refer to the Coolant Temperature Above
oolant temperature is above specification
.......
Normal - Gradual Overheat symptom tree.
OK
A
Bleed the fuel system and check for suction
ir in the fuel system
.......
leaks. Refer to Procedure 006-024.
OK
P
Verify by operating the engine from a tempo-
rary supply of No. 2 diesel fuel. Check fuel
specifications for proper fuel grade. Refer to
oor fuel quality or wrong fuel grade
.......
the Operation and Maintenance Manual, B
Series Engines, Bulletin No. 3810205.
OK
E
Check for added loading from malfunctioning
accessories or other engine-driven units,
ngine under excessive load
.......
brakes dragging, or other changes in vehicle
loading. Disengage engine-driven units.
OK
I
Remove and test the injectors. Replace as
njectors worn or malfunctioning
.......
necessary. Refer to Procedure 006-026.
OK
F
Put the engine at top dead center. Check and
adjust the fuel timing. Refer to Procedure
uel injection pump timing is not correct
.......
005-037.
L-648
