Maintenance
Fault-Finding
128 9831/0650-3 128
Change oil and filter.
Review oil and filter change period. If operating in ar-
duous applications, change more frequently.
Lubricating oil sludge excessive.
Make sure the correct lubricating oil is being used.
Fuel in the lubricating oil, engine operating too cold. Review the operation for excessive idling resulting in
the engine running below normal temperature.
Electrical sensor fault Review the operation for excessive idling resulting in
the engine running below normal temperature.
One or more engine injector worn or malfunctioning. Have oil sample analysed. Repair engine as re-
quired.
Table 41. Lubricating Oil - Pressure Low
Cause Remedy
Oil level incorrect. Check oil level.
Make sure the correct lubricating oil is being used.
Check for reduced viscosity from dilution with fuel.
Fuel dilution in lubricating oil can originate from a de-
fective high pressure fuel pump driveshaft seal.
Incorrect lubricating oil (specification of viscosity).
Review oil and filter change period. If operating in ar-
duous applications, change more frequently.
Pressure sensor or gauge fault. Change lubricating oil filter.
Change lubricating oil filter.Lubricating oil filter blocked.
Review oil and filter change period. If operating in ar-
duous applications, change more frequently.
Lubricating oil filter drain down valve not fitted. Change lubricating oil filter.
Suction pump pressure relief valve stuck open. Check/replace seal.
Oil pump pressure relief valve stuck open. Replace oil pump assembly.
Lubricating oil pump worn. Replace oil pump assembly.
Table 42. Lubricating Oil - Pressure High
Cause Remedy
Make sure the correct lubricating oil is being used.Incorrect lubricating oil (specification of viscosity).
Review oil and filter change period. If operating in ar-
duous applications, change more frequently.
Pressure sensor or gauge fault. Verify the pressure sensor is functioning correctly.
Engine running too cold. Refer to Table 45.
Oil pump pressure relief valve stuck closed. Replace oil pump assembly.
Coolant
Table 43. Coolant - Loss
Cause Remedy
Incorrect coolant level. Check the level.
Coolant leaking from engine radiator or block heater. Visually inspect the radiator heater, hoses and con-
nection to locate the leak.
External engine coolant leak. Visually inspect the engine and components for seal,
gasket hose connection leaks. Make sure all hose
clips are in good condition and torqued to the recom-
mended figure.
Overheating or compression gases leaking, resulting
in loss through the radiator overflow.
Refer to Table 44.
If equipped, transmission cooler leak. Check for mixing of coolant and transmission fluid.
If the engine is coolant aftercooled, aftercooler leak. Check/replace the aftercooler. Look for coolant in the
intake manifold and in the oil.
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