SABB MOTOR 2H - Cooling Water System Basics; Cooling Water Pump Operation; Draining Cooling Water

5. Keelcoolerdefectiveorpainted "",,"""""""""""'" Page 29
6. Heat exchanger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., Page 36
7. Cracked cylinder head causing compression leak into cooling
jacket. Symptom will be heavy bubbling in water tank. Most
easily confirmed by letting the motor cool and then letting it idle.
Winter Use
For use in winter the system should be filled with an approved make of glycol anti-
freeze. With standard piping the system holds approximately 5 litres. The
addition of 1 litre antifreeze (4 litres water) affords protection down to -80 C
while 1.5 litres of antifreeze will protect down to -150 C. Flush the whole
system with water before filling with antifreeze solution. After filling, run the engine
for 3 minutes to ensure thorough mixing. When using glycol antifreeze it is not
necessary to drain the system before or after winter use (or laying up) provided thai
the coolant remains clean and tree of rust flakes. If this is not the case the system
must be flushed through.
SEA . Fresh Water Cooling
WATE .
PUM
CG wlth Heat Exchanger
6 .
\ The lmpeller pump (4)
\ pumps sea water through
the heat exchanger (2)
where the engine fresh
water is cooled. The sea
5 water may be discharged
overboard via the exhaust
,,\ hose (wet exhaust).
NOTE:
".--
When there is a risk of trost
the sea water must be
2 drained trom heat
exchanger and im peller
3 '
-G:.~ ~",,:~~ Fig. 36 ~:~~d ~; ~~~n;~~ be
.. FRESH WATER the pump housing cover
slightly. The heat exchanger
~ SEA WATER may be drained by slacking
off the drain plug (3). Oose
the gate valve (1).
30
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