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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 premature failures.
Proper
design
of
either
a
water
jacketed or
a
water
injected
(nwetn)
exhaust system to prevent this problem requires that the sea
water
inlet be positioned so that the enter ing stream of 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 advan-
tageous 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.
PIN:
J.
H. WESTERBEKE CORP.
AIION INDUSTRIAL PARK, AIION, MASS. 02322· (617) 588-7700
CA8LE: WESTCORP, AIION·TELEX: 92-4444
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