DS 19 OPERATION No. DS 173-3 : Overhauling a petrol pump. Op. DS 173-3 120
TOOLS
7 Make sure that the screw holes in the diaphragm correspond with the threaded holes in the pump body, tighten
the nut (9).
Connect the upper part of the pump (4) to the body (5). The diaphragms should be fitted dry without any
hermetic or similar product.
Tighten the screws without inserting washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mm spanner
8 Put the filter cover joint (3) into position. Fit the filter element (2). Fit the filter cover (1), tighten the yoke
knurled nut.
9 Check for leaks (see paragraphs 10 and onwards).
INSPECTION FOR LEAKS (see Pl. 30).
10 Block up the outlet to the carburettor by means of a plug. Fit a rubber tube on the inlet pipe.
11 Completely immerse the pump in a receptacle containing clean petrol.
12 Blow compressed air at a pressure of 1
1
/
2
p.s.i. to 4
1
/
2
p.s.i. (100 to 300 g/cm
2
) through the rubber tube. At first,
this can cause bubbling, due to the movement of the diaphragm.
Hold the pressure for a short time.
If air bubbles continue to escape through the opening for the operating lever at “a”, there is a leakage
through the diaphragms and they must be replaced.
If air bubbles escape between the faces of the cover and the body or at the screws holding the cover to the
body at “b”, the faces are defective or the screws are not tightened down sufficiently.
If air bubbles continue to escape between the filter cover and the faces of the cover at “c”, the joint is
defective or the filter cover is insufficiently tightened.
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