~
FRESH WATER COOLING (Closed System)
The fresh water tank (2) (1974 1
model) is separate from the ---7 - - I
silencer and is mounted on top 2 - - . I
of it.
The thermostat (3) is located in
the silencer where it adjoins the
fresh water tank.
The keel cooler (4) is mounted
on the underside of the huIl.
If preferred, it is possible to fit
an intemal heat exchanger in
place of en extemal cooler.
). This requires a separate pump.
See page 30.
...
When first starting, fill the tank
with clean fresh water, or a
water / antifreeze mixture, via
the filler with pressure cap (1).
Top up as the water disperses
"' . through the system until the
. ~ tank is full. Check that there -~::
~
~ \ are no leaks in the system. Fig. 35
.~-
Operation
Until the cooling water bas warmed up the water flow is through the silencer cooling
jacket channels, out of the rear of the silencer and via the by-pass pipe back to the
water pump.
When the engine bas warmed the cooling water up to 55° C, the thermostat begins
to open and divert part of the water via the fresh. water tank to the extemal cooler
(or intemal heat exchanger where it is cooled before once more entering the water
pump).
- When in operation, the termostat will automatically distribute the cooling water
between extema! cooler and by-pass pipe, thus maintaining the cooling water
'" temperaturebetween55° and 75° C. (130-170° F.)
In case onncorrect operation (water temperature too high or too low) check:
.*' .
~ 1. Waterpumpdlaphragm Page 32
~ 2. Watervalves Page 31
~ 3. Termostat Page 34
4. Too little water in the tank Page 31
29
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1"'c
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