69
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.
Excessive leaking out of the breather tube
(system blocked).
Check the breather tube areas for sign of lubricating oil loss. If
necessary replace the breather gauze.
Lubricating oil cooler leak.
Check for lubricating oil in coolant.
Turbocharger leaking lubricating oil into the
air intake or exhaust.
Inspect the air crossover tube for evidence of lubricating oil
transfer.
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.