Westerbeke 7.6 KW BTD 60Hz Operator's Manual page 25

Raw Water Intake System
Make sure the intake system (raw water cooling system) is in proper order. Check that the hull inlet, sea
cock and strainer are unobstructed. Sea cocks and strainers should be at least one size greater than the
inlet thread of the sea water pump. The strainer should be of the type that may be withdrawn for cleaning
while the vessel is at sea and should be mounted below the water line to ensure self-priming. Inspect the
raw water lines to make sure there are no collapsed sections, which would restrict water flow. Make sure
there are no air leaks at any of the connections.
Cooling System
The generator's engine is fresh water-cooled by an engine-mounted heat exchanger. Raw water is used as
the heat exchange's cooling medium. Raw water is pumped into the exchanger by a raw water pump and
is then injected into the exhaust discharge, carrying with it the heat removed from the engine's fresh water
cooling system.
Raw water should be supplied to the raw water pump through a flush-type through-hull fitting using a
wire-reinforced hose between the through-hull fitting and the raw water pump. This raw water should be
directed through a visual-type raw water strainer and then delivered to the pump. Hoses routed from the
through-hull fitting to the strainer and to the raw water pump should be wire-reinforced to prevent the
hose from collapsing during the generator's operation (suction from the pump may collapse a non-
reinforced hose). Raw water strainers should be mounted at or below the water line to make sure the raw
water line remains primed after shutdown.
II
CAUTION
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Do not use a scoop-type through-hull fitting as a means of supplying raw water to the
generator. Water pressure against this type fitting, while the vessel is under way, can
push raw water past the raw water pump's impeller into the generator's exhaust system,
filling it and the engine as well. Flush-type, clear, through-hull fittings are
recommended and should be located on the hull so as to be below the waterline during
all angles of boat operation.
The use of common-type street elbows is not recommended for plumbing the raw water circuit. These
generally have very restrictive inside diameters. Machined fittings are preferred.
Electrical System
The electrical system should be checked to make sure all wiring harnesses are properly tied down with
clamps or plastic ties and that all wiring harnesses are spaced at intervals close enough to prevent chafing
from vibration. Check to make sure all engine harness connections are tight and that they are made to the
appropriate terminals.
DC Electrical Connections
A common ground for the negative (-) DC terminal connection is found at the bet! housing of the
generator, next to the starter, in the form of a threaded grounding stud. The battery ground should be
connected at this stud.
Connect the battery's positive
(+)
connection to the starter solenoid tagged for this connection.
21 WESTERBEKE GENERATORS