76
Fault Finding
CHART C4—Lubricating Oil pressure high
Cause
Remedy
Incorrect lubricating oil. (specification of
viscosity).
Make sure the correct lubricating oil is being used, Refer to Fluids
& Lubricants section.
Look for reduced viscosity from dilution with fuel. Fuel dilution in
lubricating oil can originate from fuel injection pump driveshaft
seal or fuel transfer pump.
Review/reduce the lubricating oil change intervals.
Pressure switch or gauge fault. Verify the pressure switch is functioning correctly.
Engine running too cold.
Refer to Chart D3.
Oil pump pressure relief valve stuck closed. Replace oil pump assembly.
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