23. CHECKING COOLING WATER LEVEL (Weekly):
A weekly .-;:heck is generallyadequate but if the engine is being run continuously in
warm weather, a daily check may be necessary. 1
1. The engine cooling water must have cooled
down sufficiently for the fresh water tank to
be touched without discomfort.
2. Open the pressure cap carefully. Beware of
any water spraying out since this can scald.
3. Check the level and top up if necessary to
bring the water level up to the lover edge of
the filler neck.
.. If the system contains anti-freeze, it should be
. topped either with a solution of the same _n
strength or with neat anti-freeze. (See page 30.) ~
Fig. 37
J,. 24. CHECKING THE WATER VALVE (as required):
i The wa~er valve housing (4). is mou!1ted on the cooling water pump ?n the left of
, the engIne. If pump effectlveness IS reduced, the cause may be dirt under the
'\ valves(3).
vi ~
; 1. Oose the gate valve. 1 ~
Open the drain cocks (9). 2-8
2. Undo the suction pipe connection 3 ~
to valve seat (5) and unscrew the
valvehousing(4). 1.'-
3. Holding the valve housing in a vice,
unscrew the plug (1) and the valve 2---e'
seat (5). Check for any dirt under ~
~ the valves. Renew valves and springs 3 =Ij
~ if necessary ..
~The housing may alternatively be 5 c,
secured to the water pump for re- ~
* moval of plug and valve seato
'" If the valve seat is scored it can be 6 7 8 9
rubbed carefully over a fine file, Fig. 38
rotating the seat while doing SQ.
c;.
,~i 4. Before securing the valve housing in position between clamp (7) and water pump
'~ housing, check that the gasket (8) is in good condition.
~ 5, Fit the suction pipe. Oose drain cocks and open gate valve.
i 31
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