3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Coolant Temperature Above Normal Gradual Overheat
This is symptom tree T022.
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.
adiator and charge-air cooling fins plugged
Blow debris from fins.
Check and repair fan shroud, shuttters,
irflow to the radiator is restricted (nonmarine
shutterstat, sensor, fan clutch, and viscous fan
as required. Refer to the OEM service manual.
Check the water pump for correct operation.
Replace the water pump if necessary. Refer to
ater pump is malfunctioning
an drive belt is loose, tight, or not in align-
Check the fan drive belt. Refer to Procedure
ooling system hose is collapsed, restricted, or
Inspect the radiator hoses. Refer to Procedure
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.
Refer to the Lubricating or Transmission Oil in
oolant is contaminated with lubricating oil
the Coolant symptom tree.