Repair and Maintenance of a Drascombe Lugger
Removing and re-installing the centreplate-case mounted
Bilge Pump
Re-installation of the pump
Refurbishing other pump components
Before re-installation, the pump should be inspected and
worn out components replaced. Churchouse
Boats can supply a service pack for the Chimp Pump.
It is probably worth replacing the polythene tubing of
the inlet and outlet pipes and certainly worth replacing
the galvanised jubilee hose clips with stainless steel
ones which are not that much more expensive and readily
available at most chandlers. The tubing should have an
inside diameter of 1" and the clips should be able to
take hose of outside diameter between 25mm to 35 mm.
Re-installation of the pump
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The bilge pump re-assembled
The pump has been re-assembled and a new polythene
intake pipe has been attached with a stainless
steel jubilee clip. Note the 22 mm copper pipe
connector fitted at the end of the intake pipe.
This was fitted in the original pipe and acts as a
crude anti-clogging device.
(Click on image for larger view)
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Replacing the mounting board
The first step in reinstalling the pump is to
insert the mounting board into the aperture at the
end of the casing. Do NOT fasten at this stage but
push the loose board back as far as possible as
shown in the photograph. If the board is screwed
into place at this stage there is no room to twist
the pump so that it can also be inserted into the
casing!!.
(Click on image for larger view)
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Inserting the pump into the casing
With the polythene intake pipe attached to the
pump, insert the end of the pipe down through the
back of the centreplate case into the bilge. With
the mounting board pushed back out of the way, it
should be possible to twist the pump sideways (as
shown in the photograph), so that it can also be
inserted within the casing.
(Click on image for larger view)
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Securing the Mounting Board
With both pump and mounting board inserted within
the centreplate casing the next step is to manouvre
the mounting board into position and screw into
place. The photograph shows one of the four
securing screws being driven home with a
screwdriver.
(Click on image for larger view)
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Bolting the pump to the mounting board
After the mounting board has been screwed into
place the pump can be secured by four M5 bolts. The
photo shows one of the bolts being inserted through
the base plate of the pump and through one of the
pre-drilled holes in the mounting board and the
securing nut and washer being screwed into place on
the other side of the board.
(Click on image for larger view)
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Kinking of the polythene outlet pipe
The outlet pipe can now be cut to size, and pushed
through the vent hole at the back of the
centreplate casing. The other end can be bent round
and gently eased on to the outlet pipe of the pump.
The problem with this is that the sharp bend in the
pipe in the confined space of the centreplate
casing causes the polythene to kink, severely
impairing the pumps efficiency. It is impossible to
photograph the kinked pipe in the casing so instead
the photograph shows the effect of a sharp bend in
the tubing outside the casing.
(Click on image for larger view)
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Solving the kink with a copper water pipe
elbow
One way of solving the problem of the kinked
polythene tubing is to insert a 22 mm diameter
copper (water) pipe elbow which can be purchased at
a DIY hardware store dealing in plumber's
equipment. One short straight piece of polythene
pipe joins the outlet pipe on the pump to one end
of the elbow and then a longer length joins the
other end of the elbow to the vent hole in the
centreplate casing.
(Click on image for larger view)
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The pump re-installed
Project completed. This shows the pump re-installed
and the polythene pipes re-attached with Jubilee
clips.
(Click on image for larger view)
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Project started June 2002 and completed, July 2002
Appendix added 14 May 2008
I have received the following advice from Jim Terrio;
The WHALE 'Urchin' pump is a dead ringer for the
original [Chimp Pump] and fits exactly into the area
provided. (This is a relative description as although
it does fit exactly.....getting it into the area and
making the necessary mounting bolt attachment locations
is a problem....solved but it took the better part of a
day to do it). The 'Urchin' pumps a whopping 11.4 GPM
and I filled the boat with about a foot of water and
was able to pump it out VERY quickly indeed. I paid
57.00 US dollars for the pump which is about 29 GB
Pounds.
For more information about the Whale Urchin pump follow This Link
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Introduction Removing Making a
new Mounting Board
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