-- 25. CHECKING WATER PUMP DIAPHRAGM
(At least once annually):
1. If the cooling water level (fresh water cooled
ff~ engines) falls abnormally, or if the pump cir-
I f culation is irregular(sea watercooledengines),
V the cause may be a detective diaphragm.
i 2 2. In the case of both sea water cooled and fresh
I water cooled engines, this may easily be
t:1 checked by slipping a piece of paper (3)
. ~ underneath the pump housing and flange
"\ while the engine is running.
' , "'" 3. The pump flange (1) bas drain holes (2)
1 &~ // underneath and, if diaphragm is detective,
3 ~ ..~ water will drain out and wet the paper.
Fig. 39
26. RENEWING WATER DIAPRAGM
(as required). 1. Oose gate valve. Open drain cocks (7)
and undo the pipe connections. In the
case of fresh water cooled engines,
. drain oH the anti-freeze into an emty
can.
2. Unscrew the nuts (3) and withdraw
pump housing (2) and valve housing to-
gether.
3. Undo the diaphragm screw (4) using a
good screwdriver, remove diaphragm
washer(6), andrepiace detective diaph-
ragm (5) with a new one.
4. The new diaphragm is fitted with its
marked side facing inwards. The diaph-
ragm washer is fitted on the inner side
of the diaphragm with its convex side
.., against the diaphragm.
. .. / :?" Screw firmly home.
" / r- 5. Fit the pump housing and close the
.. drain cocks. Fit the pipe connections
2 7 3 5 1 and open the gate valve. In the case of
fresh water cooled engines, fill cooling
Fig. 40 system adding anti-freeze as required.
32
/ ,.:\"
, '
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