Maintenance
Fault-Finding
129 9831/0650-3 129
Lubricating oil cooler leak. Check/replace the oil cooler. Look for coolant in the
oil.
Cylinder head gasket leak. Check/replace the head gasket.
Cylinder head cracked or porous. Check/replace the head.
Cylinder block coolant passages leaking. Check/replace the cylinder block.
Table 44. Coolant - Over Temperature
Cause Remedy
Check the level.Incorrect coolant level (low).
Ensure low level is not as a result of a coolant leak,
Table 22. Coolant - Loss.
External radiator matrix blocked with dirt or chaff. Clean exterior or radiator matrix.
Air flow to the radiator inadequate or restricted. Check/repair fan shroud, anti-recirculation sealing.
Coolant pump or fan drive belts loose. Check/correct belt tension.
Radiator hose collapsed, restricted or leaking. Check/replace hose.
Oil level over-full. Check oil level.
Cooling system pressure cap incorrect or faulty. Replace cap with the correct rating for the system.
Over concentration of anti-freeze. Remove part of the coolant from cooling system and
replace with water.
Temperature sensor faulty. Verify that the gauge and temperature sensor are ac-
curate.
Thermostat faulty, incorrect or missing. Check/replace the thermostat.
Make sure the fill rate is not exceeded and the cor-
rect vented thermostat is installed.
Air or combustion gases in the cooling system.
If aeration continued, check for a compression leak
through the head gasket.
Coolant pump faulty. Check/replace the coolant pump.
Vent line from engine and/or radiator blocked or in-
correctly routed (sudden overheating).
Check routing and operation or vent line.
Leak between the top tank and the auxiliary tank
(sudden overheating).
Check for coolant leakage between radiator auxiliary
tank and radiator top tank.
Cooling passages in radiator, cylinder head, head
gasket or block blocked.
Flush the system and fill with clean coolant.
Electrical sensor fault. Check the electrical connections at the sensors.
One or more engine injector worn or malfunctioning. Check the injectors.
Table 45. Coolant - Under Temperature
Cause Remedy
Air flow across the radiator excessive. Check/repair fan shroud, anti-recirculation sealing,
shutters, fan sensors, fan speeds as required. Refer
to the machine manufacturer's documentation for de-
tailed information.
Temperature sensor faulty. Verify that the gauge and temperature sensor are ac-
curate.
Thermostat faulty, (open - not sealing). Check/replace the thermostat.
Coolant not flowing by temperature sensor
(1)
Check/clean coolant passages.
(1) A total coolant loss may result in the gauge showing low temperature initially. In which case, check the level.
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