Service Bulletin #10: Sea Water Pump

Service Bulletin #10: Sea Water Pump
WESTERBEKE
MARINE ENGINE PRODUCTS
SERVICE BULLETIN #10
SUBJECT:
Sea Water Pump Clearance and Alignment
MODEL:
Westerbeke 40 and WPDS 10-15
Clearance:
Adequate longitudinal clearance between the sea water pump shaft and the
driving shaft is established by the use of multiple pump gaskets. The number
of gaskets required can vary from 1 to 4. Enough gaskets must be used so
that the shaft ends do not mate. See figure 1.
I'IA":'EP PUMP GA
DRIVE SHAFT DRIVER
NOTE:
PUMP SHAFT
The application of liquid
(DRIVEN)
or paste type Prussian
blue (at points indicated
by arrows) will give
positive indications of
pump drive contact which
will require the use of
additional gaskets.
',XO"S-~
If the proper clearance is not maintained, the sea water pump shaft will
force the fuel pump drive hub against its bushing. The bushing will seize
to the drive hub and rotate in its housing. Bushing wear and loss of oil
pressure will result.
When replacing the sea water pump be sure that the same number of gaskets
is replaced and there is the required clearance.
Alignment:
Alignment is just as critical as clearance. The latest 1/2" pump
intentionally has no pilot because the location of the timing cover itself
is not precise. To assure that the pump shaft is axial with the driving
shaft, install the pump with the four nuts just snugged. WITH THE FUEL
STOP LEVER OFF, crank the engine for a few seconds. If the nuts have not
been overtightened, the drive tang will cause the pump to align itself.
It is best to deliberately offset the pump against its studs so you can
visually verify movement of the pump as it centers itself during cranking.
The nuts should then be tightened. This procedure must be repeated anytime
the pump is loosened.
PIN 16742
9/17/76
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