SABB MOTOR 2H - Cooling System Checks; Cooling Water Level Check; Water Valve Checks

27. CHECKING DIAPHRAGMS IN DOUBLE WATER PUMP
(Ay least once annually):
~ Fresh water cooled engines are usually fitted with a double water pump (wet
" exhaust). The stand;trd pump (outermost) circulates the fresh water and the extra
pump (nearestengine) cools the rubber exhaust base.
. .
- 1. Remove pressurecap, open dram cocks (6)
~off anti-freeze into an emty can. "',f..-"
/(
f ,.rr'r2. Oose gate valve tor extra pump /'
~:) ~~ ~~~p~ pipe connections 8 9 ,10 ,'1 -I Il ~
3. Undo securing ~lts(7) and with-
~~~d\'~~ (~~~?'-
draw pump housmg(8). e ( v ~ :::---9
~ r~ ,'I ~ ./' "'-
4. Unscrew the diaphragm screw %k ~
(9) using a good screwdriver, re- ; -< '\ ,~
1move the diaphragm (10) and
~~' '""'
"" diaphragm washer (11). Undo ::->
the securing balts (5) and with- ~~
draw pump housing (4). Remove 7 6 5 I. 3 2 1
large diaphragm (3) and inner Fig. 41
.'" washer (2).
"" 5. Check bath diaphragms and renew if necessary .
.\
Assembly:
6. Diaphragm (10), with its marked side facing inwards, is fitted onto the diaph-
ragm screw (9). Then fit the diaphragm washer (11) with its convex side against
the diaphragm.
~ 7. The large diaphragm (3) is positioned in the pump housing seating and the
diaphragm screw, with diaphragm and washer, is insérted trom the outside. The
diaphragm washer (2) is fitted onto the end of the screw (9) and the whole assem-
~ bly is positioned against the pump flange (1), centred and secured using
~ thefixingbolts(5).
8. Tighten the diaphragm screw (9) securely, fit the water pump and re-make all
pipe connections. Oose the drain cocks and open the gate valve on the extra
:. pump. Top up the fresh water system.
~
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~ .cc~'-
33
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