1C-24 - TROUBLESHOOTING 90-823225--1 1096
Excessive Oil Consumption
Cause Special Information
Normal consumption.
One quart of oil consumed in 5-15 hours of
operation at wide-open-throttle (especially in a
new or rebuilt engine) is normal
Oil leaks
Clean bilge, run engine with clean white paper
on bilge floor, locate oil leak(s)
Oil too thin Oil diluted or wrong viscosity
Oil level too high
Drain holes in cylinder head plugged Oil will flood valve guides
Defective valve seals
Intake manifold gasket leaking
Worn valve stems or valve guides
Defective oil cooler (if so equipped) Crack in cooler tubes
Defective piston rings
Glazed, scuffed, worn, stuck, improperly
installed; ring grooves worn; improper break-in;
wrong end gap
Defective cylinders
Out of round, scored, tapered, glazed; excessive
piston to cylinder clearance; cracked piston
Excessive bearing clearance
NOTE: ENGINE CRANKCASE OIL MUST BE CHECKED AT INTERVALS SPECIFIED IN “MAINTENANCE
SCHEDULE” in Section 1B. It is normal for an engine to use a certain amount of oil in the process of lubricating
and cooling the engine. The amount of oil consumption is greatly dependent upon engine speed, with consump-
tion being highest at wide-open-throttle and decreasing substantially as engine speed is reduced.
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