Service manual

TROUBLESHOOTING SERVICE MANUAL NUMBER 26
Page 1C-28 90-861329--1 MARCH 1999
Excessive Oil Consumption
NOTE: Normal consumption is one quart of oil consumed in 5-15 hours of operation at wide-
open-throttle (especially in a new or rebuilt engine).
Cause
Special Information
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
IndexIndex