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SERVICE BULLETIN
DATE:
5/6/74
BULLETIN NUMBER: 69
MODEL:
All Marine Generators and Marine Engines
SUBJECT:
Exhaust System Failures
When engine sea water is fed into an exhaust system so that
the full stream strikes a surface, erosion may cause prema-
ture failures.
Proper design of either a water jacketed or a water injected
("wet") exhaust system to prevent this
pr~blem
requires that
the sea water inlet be positioned so that the entering stream
of sea water does not strike a surface directly.
Also, the
velocity of the entering sea water stream should be as low as
possible which is achieved by having inlet fittings as big in
diameter as possible.
In addition to the above design considerations, it is usually
advantageous to divide the sea water flow at the point of
entry to the exhaust system so that only a portion of it
enters the exhaust system.
The remainder is normally piped
directly over the side.
The proper proportion of the sea
water flow to pass through the exhaust system can only be
determined
by
tr ial
and
error.
The goal
is
to prevent
excessive exhaust temperatures with the least amount of sea
water.
103
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