Westerbeke 7.6 KW BTD 60Hz Operator's Manual page 48

ANTIFREEZE CONCENTRATION DATA
Antifreeze
Concentration
Freezing
Temperature
%
13
23
(-5)
23
14
(-10)
B.
Filling the Fresh Water System
30
5
(-15)
35
-4
(-20)
45
-22
(-30)
50
-40
(-40)
60
-58
(-50)
A coolant recovery tank kit is supplied with each Westerbeke diesel engine. 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 kit is supplied with each Westerbeke diesel engine. 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.
FUNCTION OF MANIFOLD PRESSURE CAP
From Coolant Tank
COOLANT RETRACTION
COOLANT EXPANSION
Coolant from the engine, when heated during engine operation, will expand, lifting the spring-loaded
manifold pressure cap, and enter the recovery tank by way of 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
contraction of the engine coolant, allowing some of the coolant in the recovery tank to be drawn back into
the engine's cooling system, free of air without loss. Periodically check that the passage (A) between the
90° fitting on the manifold and the filler neck in the manifold is clear so coolant flow in either direction.
WESTERBEKE GENERATORS 44