DS 19 OPERATION No. DS 173-3 : Overhauling a petrol pump. Op. DS 173-3 119
PARTICULAR POINTS
Overhauling a GUIOT pump.
The seats of the inlet and outlet valves are set in the cover of the pump. In case of poor functioning of the valves it will be necessary to
replace the pump.
The diaphragms should be fitted dry (important).
Immerse the pump in a container filled with clean petrol, no leak should occur when compressed air is injected through the feed pipe at a
pressure of 1
1
/
2
p.s.i. to 4
1
/
2
p.s.i. (100 to 300 g/cm
2
).
TOOLS
OVERHAULING A GUIOT PETROL PUMP
Dismantling (see Pl. 29).
1 Remove the filter cover (1), disengage the filter (2). Extract the cover joint (3).
2 Disengage the upper part of the pump (4) from the body (5). Drive out the pin (6) from the operating lever.
Disengage the diaphragm assembly (7) and the push-rod (8).
3 Unscrew the nut (9), withdraw the serrated washer.
Disengage the rod (8), the upper support washer (10), the set of 4 diaphragms (7), the lower support washer (11),
the joint (12), the spring (13), the cup (14), the joint (15), the cap pressure washer (16) and the sealing cap (17). 10 mm spanner
NOTE – The seats of the inlet and outlet valves are set in the cover of the pump, in cases of poor functioning of
the valves it will be necessary to replace the pump.
4 Clean the parts.
Assembling (see Pl. 29).
5 Put the sealing cap (17) on the push-rod (8).
Then place on the rod (8) in the following order; the cap pressure washer (16), the joint (15), the cup (14),
the joint (12), the spring (13), the end with the large diameter on the washer (16). Fit the lower support washer
(11), the set of 4 diaphragm washers (7), the upper support washer (10), a serrated washer and screw on the
nut (9) without tightening.
6 Offer up the diaphragm and push-rod assembly in the pump body.
Fit the operation lever and press in the pin (6) and peen it lightly.
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