SERVICE MANUAL NUMBER 24
TROUBLESHOOTING
Water In Engine
Important Information
IMPORTANT: First determine location of water in engine. This information can be of
great help when trying to determine where the water came from and how it got into
the engine. The three most common problems are water on top of pistons, water in
crankcase oil, water in crankcase oil and on top of pistons.
The first step, after locating water, is to remove all the water from the engine by removing
all spark plugs and pumping cylinders out by cranking engine over. Change the oil and filter.
Start engine and see if problem can be duplicated. If problem can be duplicated, a mechani-
cal problem exists. If the problem cannot be duplicated, the problem is either an operator
error or a problem that exists only under certain environmental conditions.
If water is contained to cylinder(s) only, it is usually entering through the intake system,
exhaust system or head gasket.
If the water is contained to crankcase only, it is usually caused by a cracked or porous block,
a flooded bilge or condensation.
If the water is located in both the cylinder(s) and the crankcase, it is usually caused by water
in the cylinders getting past the rings and valves or complete submersion.
Checking for rust in the intake manifold or exhaust manifolds is a good idea. Rust in these
areas will give clues if the water entered these areas.
Index
90-861327--1
OCTOBER 1999
Page 1C-25
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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