COOLING SYSTEM - M.5
the engine has been laid up for any considerable length
of time. This is effected by disconnecting the pipe
between the water pump and the heat exchanger at its
upper end, filling it with water and then reconnecting it to
the heat exchanger.
This pump should never be run in a dry condition
and if the engine is to be withdrawn from service for any
length of time, it will be necessary to pack the water
pump with MARFAK 2HD grease. (Where this is not
available, Glycerine may be used instead). This may be
effected by removing the water pump end plate, giving
access to the interior of the pump, which can then be
packed with grease.
This treatment is usually effective for about three
months,
and
should
be
repeated
prior
to
recommencement of service if laid up for a longer period
than this.
N.B. Due to considerable suction created by this
type of pump, it is essential that where rubber hose pipe
is employed on this side of the pump any 'runs' of hose
should be reinforced internally, likewise at junctions the
pipe ends should almost butt together to prevent either
partial
or
complete
collapse
with
subsequent
overheating.
To Remove the Pump
1.
Uncouple the inlet and outlet water connections.
2.
Remove the nuts securing the pump to the back
of the timing case.
3.
Withdraw the pump complete with its driving
gear from the studs. The pump may be
replaced by reversing the above procedure.
Dismantling the Pump
1.
Remove the water pump end cover plate.
2.
Remove the impeller by means of a pair of
pliers. If it is tight on the shaft, loosen it by
holding the impeller and twisting the shaft
backwards and forwards.
3.
Loosen the cam locking screw a few turns, then
lightly tap screw downwards to loosen the cam
in the water pump body.
Fig. M.6.
Removing Water Pump End Cover Plate
4.
Remove the cam locking screw and cam.
5.
Remove wear plate from inside of impeller
housing.
6.
Remove the circlip on the water pump shaft and
withdraw the spring loaded seal and seal seat.
Fig. M.7.
Removing Water Pump impeller
