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Dry stack-type exhaust systems
(shown to the right) must be at-
tached to the generator engine's
exhaust manifold by means of a
flexible connector pipe.
This
system must be properly supported,
insulated, and routed so as not to
allow water to enter the engine's
cylinders by coming in through
this piping.
Provisions must be
made for discharging the engine's
raw cooling water overboard.
Exbaust System Failures
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DRY STACt EXHRUST
When the engine's raw water is fed into an exhaust system so that the full stream of this water strikes a
surface, 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 raw water
inlet be positioned so that the entering stream of raw water does not directly strike a surface. In addition,
the velocity 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 beating
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. Rigidly
constructed exhaust risers installed off the exbaust manifold must not exceed 8 Ibs in total weight.
Excessive unsupported weight could cause deflection or distortion of the manifold resulting in damage
and/or internal leaks. Rigidly constructed riser assemblies that do exceed 8 Ibs. must be supported to the
engine, not to the hull. Inspect insulated portions of the exhaust system to ensure there is no deterioration
of the insulation.
II
CAUTION
II
Prolonged cranking intervals without tbe engine starting can result in filling the
engine-mounted exbaust system witb sea water coolant. This may halJpen because
tbe sea water pump is pumping sea water tbrougb tbe sea water cooling system
during cranking. This sea water can enter tbe engine's cylinders by way of tbe
exbaust manifold once tbe exhaust system fills. Prevent tbis from balJpening by
closing tbe sea water supply througb-bull sbut-off, drain tbe exbaust mumer, and
correct tbe cause for the excessive engine cranking needed to obtain a start. Engine
damage resulting from tbis type of sea water entry is not a warrantable issue; tbe
owner/operator should keep tbis in mind.
WESTERBEKE GENERATORS
18
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