Westerbeke 9.0 BCG Technical Manual page 27

Cooling System
A coolant recovery tank kit is supplied with each Westerbeke diesel generator. The purpose of this recovery
tank is to allow for engine coolant expansion and contraction, during engine operation, without the loss of
coolant and without introducing air into the cooling system.
This coolant recovery tank should be installed at, or above, engine manifold level, in a location where it can
be easily monitored and where coolant can be easily added if needed (see the figure below). A stainless
steel mounting bracket is supplied with each kit along with 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.
COOLANT RECOVERY TANK
COOLANT PASSAGE
Coolant Recovery Tank, Recommended Installation
Coolant from the engine, when heated during the engine's operation, will expand, lift the spring-loaded
manifold pressure cap, and enterthe recovery tank via the hose connecting the recovery tank to the manifold.
When the engine is shut down and cools, a small check valve in the pressure cap is opened by the contrac-
tion of the engine's coolant, allowing some coolant in the recovery tank to be drawn back into the engine's
cooling system, free of air and without loss.
An antifreeze mixture should be maintained in the engine's freshwater cooling circuit of adequate propor-
tions to prevent freezing and compatible with aluminum engine components. This mixture should be check-
ed seasonally for freeze protection, sampling both the mixture in the coolant recovery tank and that in the
exhaust manifold/expansion tank. Maintain the manifold/expansion tank completely full.
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Westerbeke Generators