Excessive Oil Consumption
Cause
Special Information
One quart of oil consumed in 5-15 hours of
operation at wide-open-throttle (especially in a
new or rebuilt engine) is normal
Normal consumption.
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
Defective valve seals
Oil will flood valve guides
Intake manifold gasket leaking
Worn valve stems or valve guides
Defective oil cooler (if so equipped)
Crack in cooler tubes
Glazed, scuffed, worn, stuck, improperly
installed; ring grooves worn; improper break-in;
wrong end gap
Defective piston rings
Out of round, scored, tapered, glazed; excessive
piston to cylinder clearance; cracked piston
Defective cylinders
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.
Index
1C-24 - TROUBLESHOOTING
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you