Westerbeke BCD 4.4KW Operator's Manual page 50

Antifreeze
Concentration
Freezing
Temperature
ANTIFREEZE CONCENTRATION DATA
% 13 23
30
35 45
50 60
°
F 23 14 5 - 4 - 22 - 40 - 58
e
C) (-
5) (-10) (-15) (- 20) (- 30) (- 40) (- 50)
NOTE: An antifreeze concentration should
be
selected on the basis of a temperature which
is about 10° F (5° C) lower than the actual atmospheric temperature expected.
B. Filling the Fresh Water System
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 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
to
Coolant
Tank
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 contrac-
tion ofthe engine coolant, allowing some of the coolant in the recovery tank to be drawn back into the engine's
cooling system, free of air and 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 can flow in either direction.
47 Westerbeke Generators