NC HT1.0 - Fault Finding; Lubricating Oil consumption excessive

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Fault Finding
CHART C1—Lubricating Oil consumption excessive
Cause
Remedy
Oil leaks. Inspect the engine for visible signs of leaks. Pay particular
attention to the seals, gaskets, oil cooler and external connections.
Oil level over full. Check oil level.
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.
Lubricating oil cooler leak. Check for lubricating oil in coolant.
Valve guide seals are leaking. Replace valve guide stem seals as required.
Piston rings not sealing. Lubricating oil
being consumed by the engine. (Blue smoke
from the exhaust).
Check engine compression.
Worn cylinder bores. Lubricating oil being
consumed by the engine. (Blue smoke from
the exhaust).
Check engine compression.
Glazed cylinder bores. De-glaze bores as required.