Westerbeke BCG4.0KW Operator's Manual page 26

Dry stack-type exhaust systems (shown
to the right) must be attached to the gen-
erator engine's exhaust manifold by
means of a flexible connector pipe. This
system must be properly supported and
insulated to prevent water from entering
into the engine's cylinders. Provisions
must be made for discharging the
engine's cooling sea water.
Exhaust System Failures
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PXTI: .. EXHAUST LIHf
SE:A WATER
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HULL I'"1:Tl":t ....
DRY STACK EXHAUST
When the engine's sea water is fed into an exhaust system so that the full stream of this water strikes a sur-
face, erosion takes place. This erosion 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 sea water inlet be
positioned so that the entering stream of sea water does not directly strike a surface. In addition, the velocity
of the entering sea 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 sys-
tem. Check for leaks around manifolds, gaskets, and welds. Make sure exhaust lines are not heating sur-
rounding 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. Exces-
sive weight could cause deflection or distortion of the lines, resulting in damage or leaks. Inspect insulated
portions of the exhaust system to ensure there is no deterioration of the insulation.
CAUTION
Prolonged cranking intervals without the engine starting can result in filling the engine-
mounted exhaust system with sea waler coolant. This may happen because the sea
water pump is pumping sea water through the sea water cooling system during crank-
ing. This sea water can enter the engine's cylinders by way 01 the exhaust manifold
once the exhaust system fills. Prevent this from happening by closing the sea water
supply through-hull shut-off, drain Ihe exhaust mulller, and correct Ihe cause lor the
excessive engine cranking needed to obtain a start. Engine damage resulting from this
Iype of sea waler entry is nol a warrantable issue; the owner/operalor should keep this
in mind.
23
Weslerbeke Generators