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Exhaust System Failures
When the engine's raw water is fed into an exhaust system so that the full stream of this water
strikes a surface, errosion takes place. This errosion may cause premature failures. The proper
design of either a water jacketed or water injected "wet" exhaust system to prevent this problem
requires that the raw water inlet be posttioned so that the entering stream of raw water does
not directly strike a surface. In addition, the veloctty of the entering raw water stream should
be as low as possible, which can be achieved by having inlet fittings as big in diameter as
possible.
The best protection against carbon monoxide poisoning is a daily inspection of the complete
exhaust system. Check for leaks -around manifolds, gaskets, and welds. Make sure exhaust
lines are not heating surrounding areas excessively. If excessive heat is present, correct the
situation immediately. If you notice a change in the sound or appearance of the exhaust system,
shut down the unit immediately and have the system inspected and repaired at once by a
qualified mechanic.
Make sure there are no unnecessary objects suspended from any portion of the exhaust lines.
Exhaust risers installed off the exhaust manifold should not exceed 8 Ibs in total weight when
rigidly constructed. Excessive weight could cause deflection or distortion of the manifold resulting
in damage and/or internal leaks. Inspect insulated portions of the exhaust system to ensure
there is no deterioration of the insulation.
ICAUtloN)
Do Not Overcrankl
Prolonged cranking intervals without the engine starting can
resu~
in
filling the exhaust system with raw water coolant. This may happen
because the raw water pump is pumping raw water through the raw
water cooling system during cranking. This raw water can enter the
engine's cylinders by way of the exhaust manHold once the exhaust
system fills. Prevent this from happening by closing the raw water supply
through-hull shut-off, drain the exhaust muffler, and correct the cause
for the excessive engine cranking needed to obtain a start. Engine
damage resulting from this type of raw water entry is IlQ1 a warranted.
The owner/operator should keep this in mind.
Raw Water Intake System
Make sure the intake system (raw water cooling system) is in proper order.
Check that
the hull inlet, sea cock and strainer are unobstructed.
Sea cocks and strainers should be
at least one size greater than the inlet thread of the sea water pump.
The strainer should
be of the type that may be withdrawn for cleaning while the vessel is at sea and should
be mounted below the water line to ensure self-priming.
Inspect the raw water lines to
make sure there are no collapsed sections, which would restrict water flow.
Make sure
there are no air leaks at any of the connections.
The sea water strainer should be posi-
tioned at the vessel water line or below so as to be self primed.
Westerbeke Generators
27
15.0KWBTDA
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Troubleshooting
