Westerbeke 20B TWO/30B THREE User Manual

Antifreeze
Concentration
Freezing
Temperature
ANTIFREEZE CONCENTRATION DATA
'Ib 13 23 30 35 45 50 60
OF 23 14 5 -4 -22 -40 -58
(" C) (- 5) (-10) (-15) (- 20) (- 30) (- 40) (- 50)
NOTE: An antHreeze COIlCei Ibation should·be selected on the basis of a temperature which
Is about 100 F (50 C) lower than the actual atmospheric temperature expected.
B. Filing the Fresh water System
A coolant recmery 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 easIy 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 3O-inch length of clear plastiC hose and clamps
to connect the hose beWleen the engine's manifold fitting to the hose spud on the base of the recovery tank.
FUNCTION OF MANIFOLD PRESSURE CAP
COOLANT EXPANSION
CooIantfrom the engine, when heated during engine operation, will expand,lilting the spring-loaded manifold
pressure cap, and enter the recavery 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 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 goo fitting
on the
manifold and the filler neck in the manifold is clear so coolant can flow in either direction.
~ WESTERBEKE
Engines & Generators
32

Westerbeke 20B TWO/30B THREE Specifications

General

Brand	Westerbeke
Model	20B TWO/30B THREE
Category	Engine
Language	English