Lubricating Oil Consumption Excessive - NC HT1.0 Original Instructions Manual

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