TM 5-2420-230-24-2
3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-17
Coolant Temperature Above Normal Gradual Overheat
This is symptom tree T022.
Cause
Correction
Inspect the engine and cooling system for
Coolant level is below specification
.......
external coolant leaks. Repair if necessary.
Add coolant. Refer to Procedure 008-018.
OK
R
adiator and charge-air cooling fins plugged
.......
Blow debris from fins.
(nonmarine only)
OK
A
Check and repair fan shroud, shuttters,
irflow to the radiator is restricted (nonmarine
shutterstat, sensor, fan clutch, and viscous fan
.......
engines only)
as required. Refer to the OEM service manual.
OK
W
Check the water pump for correct operation.
Replace the water pump if necessary. Refer to
ater pump is malfunctioning
.......
Procedure 008-062.
OK
F
an drive belt is loose, tight, or not in align-
Check the fan drive belt. Refer to Procedure
.......
ment
008-002.
OK
C
ooling system hose is collapsed, restricted, or
Inspect the radiator hoses. Refer to Procedure
.......
leaking
008-045.
OK
C
Clean the cooling system. Refer to Procedure
ooling system is contaminated with dirt,
008-018. Rod the radiator, if neccessary. Refer
.......
scale, or sludge
to the OEM service manual.
OK
C
Refer to the Lubricating or Transmission Oil in
oolant is contaminated with lubricating oil
.......
the Coolant symptom tree.
OK
B
(Continued)
L-601
