Operator`s manual
FUNCTION
OF
MANIFOLD
PRESSURE
CAP
From Coolant Tank
COOLANT
RETRACTION
to Coolant Tank
Coolant from the engine, when heated during the engine's operation, will expand, lift the spring-loaded
manifold pressure cap and enter the 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 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.
Fill the fresh water system as follows:
1.
Remove the pressure cap from the manifold.
2.
Pour a clean, water/antifreeze mix1ure into the manifold and allow enough time for the coolant mix1ure
to
fill the fresh water cooling system and expel all air.
3.
Replace the pressure cap on the manifold.
4.
Remove the plastic cap from the coolant recovery tank and fill the tank with coolant mix1ure halfway be-
tween the
ADD
mark and the MAX mark. Replace the cap on the manifold.
5.
Start and run the engine long enough for the engine
to
warm up so the thermostat will open, allowing the
coolant mix1ure
to
flow through the engine block and to the rest of the fresh water cooling system.
6.
Add coolant mix1ure to the recovery tank, as required, to
top
off the fresh water cooling system. (Peri-
odically check that the manifold
is
completely full and no air pocket is present.)
Thermostat
The thermostat used is simply a choke device that remains closed causing the coolant mix1ure in the engine
block
to
rise
in
temperature. This temperature rise effects the thermostat causing
IT
to open; thus, allowing
coolant mix1ure
to
circulate through the cooling system.
Westerbeke Generators
44