Cooling System - Westerbeke BTDA 15.0 Operator's Manual & Installation Manual

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 wtth tt 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 fttting
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
alter shutdown.
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Do Not Use A Scoop-type Through·hull Fitting
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
tt
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 circutt.
These generally have very restrictive inside diameters. Machined fittings are preferred.
Coolant Recovery Tank, Recommended Installation
A coolant recovery tank kh is supplied whh
each Westerbeke diesel engine. The purpose
of this recovery tank is to allow for engine
coolant expansion and contraction, during en-
gine operation, whhout the loss of coolant
and wtthout introducing air into the cooling
system.
This coolant recovery tank should be installed
at, or above, engine manifold level, in a loca-
tion where tt can be easily monhored and
where coolant can be easily added if needed
(figure 3.19). A stainless steel mounting brack-
UN . . . , . . . . . . "
et is supplied wtth each ktt along wtth a 30
inch length of clear plastic hose and clamps
to connect the hose between the engine's
manifold fitting to the hose spud on the base
of the recovery tank. figure 3.19: Coolant Recovery Tank Installation
15.0KW BTDA
28 Westerbeke Generators