Westerbeke BCD 4.4KW Operator's Manual page 51

COOLANT RECOVERY TANK
Coolant Recovery Tank, Recommended Installation
Fill the fresh water system as follows:
1. Remove the pressure cap from the manifold.
2. Pour a clean, antifreeze mixture into the manifold and allow enough time for the coolant to fill the fresh
water COOling system.
3. Start the engine and allow it to come up to its operating temperature. Monitor the coolant in the manifold
and add antifreeze coolant as air is expelled. Once all air is expelled from the system, fill the manifold to
the filler neck and install the pressure cap.
4. Remove the plastic cap from the plastic coolant recovery tank and fill the tank with coolant halfway be-
tween the
ADD
mark and the
MAX
mark. Replace the plastic cap.
5. Run the engine and observe the coolant's expansion flow into the plastic recovery tank.
6. Check for leaks between the pressure cap/filler neck and then plastic recovery tank. Stop the engine and
allow it to cool. Coolant should be drawn back into the cooling system as the engine's temperature comes
down.
7. Add coolant to the recovery tank, as required, to top off the fresh water coolant system.
Thermostat
Generally, thermostats are of two types. One is simply a choking device which opens and closes as the
engine's temperature rises and falls. The second type has a bypass mechanism. Usually this is a disc on
the bottom of the thermostat which moves downward to close off an internal bypass passage within the
head. Since 1980, each type of thermostat has a hole punched through it. The hole is a bypass to prevent
the exhaust manifold from overheating during the engine's warm-up. Replacement thermostats must have
this design characteristic.
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