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Dry stack-type exhaust systems
(shown to the right) must be at-
tached to the generator engine's ex-
haust 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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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 sys-
tem inspected and repaired at once by a qualified mechanic.
Make sure there are no unnecessary objects suspended from any portion of the exhaust lines. Excessive
weight could cause deflection or distortion of the lines, resulting in damage or leaks. Inspect insulated por-
tions of the exhaust system to make sure there is no deterioration of the insulation.
NOTE: A maximum of 8 Ibs can be attached to the exhaust manifold without support.
CAUTION
Prolonged cranking intervals without the engine starting can result in filling the engine-mounted
exhaust system with sea water coolant. This may happen because the sea water pump is
pumping sea water through the sea water cooling system during cranking. This sea water can
enter the engine's cylinders by way of the exhaust manifold once the exhaust system fills.
Prevent this from happening by closing the sea 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 sea water entry is not a warrantable issue; the
owner/operator should keep this in mind.
23
Westerbeke Generators
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