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96
OPERATION
No.
ID
173-3
:
Overhauling
a Guiotpump
ID
19
3
7
12
PARTICULAR
POINTS.
If
the valves are not functioning
correctly, replace the pump (valve seats in the cover).
The diaphragms
must be$tted
dry (important).
Immerse the pump in a container filled with clean petrol,
no leak should occur when compressed air is injected through
the rubber feed pipe at a
pressure of If to 4$ p.s.i. (100 to 300 g/cm2).
DISMANTLING
(see
Pl.
30).
Remove
the
bowl
(l),
remove
the
filter
(2)
and
withdraw
the
bowl
gasket
(3).
Disconnect
the
upper
part
(4)
of the
pump
from
the
body
(5).
D
. rive
out
the
priming
lever
fulcrum
(6).
Remove
the
diaphragm
assembly
(7)
and
push-rod
(8).
Undo
the
nut
(9),
withdraw
the
serrated
washer.
From
the
rod
(8),
remove
the
upper
thrust
washer
(lo),
the
set
of 4 diaphragms
(7),
the
lower
thrust
washer
(1 l),
the
gasket
(12),
the
spring
(13),
the
cup
(14),
the
gasket
(15),
the
cap
thrust
washer
(16)
and
sealing
cap
(17)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..f.........
NOTE
-
The
inlet
and
outlet
valve
seats
are
incorporated
in
the
pump
cover.
If
the
valves
do
not
function
properly,
the
pump
must
be
replaced.
Clean
the
components.
ASSEMBLY
(see
Pl.
30).
Fit
the
sealing
cap
(17)
on
the
push-rod
(8).
Th en
place
on the
rod
(8):
the
cap
thrust
washer
(16),
the
gasket
(15),
the
cup
(14),
the
gasket
(12),
the
spring
(13),
the
end
with
the
larger
diameter
on
the
washer
(16).
Place
in
position
the
lower
thrust
washer
(ll),
the
set
of 4 diaphragms
(7),
the
uppzr
thrust
washer
(10)
and
a serrated
washer
and
screw
on
nut
(9)
without
tightening
it.
.I
Introduce
the
diaphragm
and
push-rod
assembly
into
the
body
of the
pump.
Fit
the
priming
lever,
insert
the
fulcrum
(6)
and
crimp
slightly.
Make
sure
that
the
holes
in
the
diaphragms
for
the
screws
are
aligned
with
the
threaded
bores
in
the
pump
body.
Tighten
the
nut
(9)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Secure
the
upper
part
(4)
of the
pump
to
the
pump
body
(5).
The diaphragms
must beJitted dry, no hermetic compound or similar
material
should be used.
Tighten
the
assembly
screws
without
using
washers.
TOOLS
10 mm
spanner
10 mm
Spanner
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