D. COOLINGWA1ER
The cooling water pump is a diaphragm pump
consisting of a rubber diaphragm sandwiched
between the pump housing and the flange
beneath.
The rate of flow of cooling water can be
regulated by means of the gate valve to give a
suitable cooling water temperature with the
engine fully loaded. This temperature should be
between 40° and roo C.
At reduced speed this temperature will fal!
somewhat. This wi1l not damage the engine and
there is no need to adjust the gate valve as
engine loading varies.
Fig. 33
T.o. protect. the cooling .water c~annels a.nd ')
plpmg agamst electrolytic corrOSlon, a Zlnc
anode (plug) is fitted to the forward end of the
silencer. Page 35.
NOTE: In particularly sandy waters, the diaphragm pump can he
replaced by an impeller pump.
". 22. DRAINING OFF THE COOLING WATER
Important - in case ot trost.
1. In cold weather - or when there is a risk of trost - the
, water must he drained off using the two drain cocks (1)
on the water pump (fig. 33).
2. The silencer can be drained by unscrewing the zinc
'-~ 2 plug on the forward end (see page 35).
-,
:;: ""f"""~"
~ 3. Remember th~t the gate valve (2) must ~ways be closed
;~ ~ before the drain cocks are opened or the lmpeller pump
~.~ ".'.' '- "- body cover is loosened.
':-,'~ .
. 4. Open bilge pump drain cock.
Fig. 34
For draining of impeller pump, see page 35.
28
To Next Page
Loading...
