TROUBLESHOOTING SERVICE MANUAL NUMBER 22
Page 1C-26 90-860074--1 FEBRUARY 2002
Excessive Oil Consumption
NOTE: One quart of oil consumed in 15 hours of operation at WOT, especially in a new or
rebuilt engine, is normal
Cause Special Information
1. Normal consumption 1. One quart of oil consumed in 15 hours
of operation at wide-open-throttle
(especially in a new or rebuilt engine) is
normal
2. Oil leaks 2. Clean bilge, run engine with clean
white paper on bilge floor, locate oil leak(s)
3. Oil too thin 3. Oil diluted or wrong viscosity
4. Oil level too high
5. Drain holes in cylinder head plugged 5. Oil will flood valve guides
6. Defective valve stem seals (if
equipped)
7. Worn valve stems or valve guides
8. Defective oil cooler (if equipped) 8. Crack in cooler tubes
9. Defective piston rings 9. Glazed, scuffed, worn, stuck,
improperly installed; ring grooves worn;
improper break-in; wrong end gap
10. Defective cylinders 10. Out of round, scored, tapered, glazed;
excessive piston to cylinder clearance;
cracked piston
11. Excessive bearing clearance
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