G424 Service Manual Adjustment and Troubleshooting178
Water in Engine
Determine location of water in engine. This information is necessary to determine where the water came from and
how it got into the engine. The most common problems are water on top of pistons and/or water in crankcase oil.
1. After locating the water, remove all the water from the engine by removing all spark plugs and pump cylinders
by cranking engine over. Next change oil and filter. Start engine and see if problem can be duplicated. If so,
there is more than likely a mechanical problem. If problem cannot be duplicated, it is either an operator error or
a problem that exists only under certain environmental conditions.
2. If water is confined to cylinders, it is usually entering through the intake system, exhaust system or head
gasket.
3. If the water is confined to crankcase, it is usually caused by a cracked or porous block or condensation.
4. If the water is located in both the cylinders and the crankcase, it is usually caused by water in the cylinders
getting past the rings and valves.
5. 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 through these areas.
Symptom Cause
1. Water found on top of A. Cracked exhaust manifold (water cooled).
the pistons. B. Improper manifold-to-elbow gasket installation (water cooled).
C. Loose cylinder head bolts.
D. Blown cylinder head gasket. (Check for warped cylinder head or cylinder
block).
E. Cracked valve seat.
F. Porous or cracked casting (check engine).
2. Water found in the A. Water seeping past piston rings or valves.
crankcase oil. B. Engine running cold (defective thermostat) causing condensation.
C. Intake manifold leaking near a water passage.
D. Cracked or porous casting.
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