Do not clamp a pump in a vice to dismantle it — the pressure could break the alloy casting.Remove the top of the pump first. It is held on by a central bolt or screw, except on the SU AUF 700, which is held by three screws that also partly hold the halves of the body together.crankshaft auto oil seals Good quality.
Mark or scratch both halves so that you can refit them in the same position — but do not scratch a line straight across the diaphragm edge.shaft oil seals.Hold the halves together while you remove all the body screws. Spring pressure inside will push them apart. Release your grip slowly; the diaphragm may stick and need gently freeing.auto oil seals. Do not pry with a sharp metal object, which might scratch the mating surfaces and cause a leak.
Freeing the diaphragm
On AC-Delco type pumps the link from the diaphragm centre ends in a T, which fits through a slot in the lever. Hold the lever down, press the diaphragm centre down, and give the diaphragm a quarter turn.crankshaft auto oil seals Good quality.
SU pumps have a slot in the diaphragm link, into which the lever slides. dust oil seals.Press the diaphragm down while you free the lever by pushing its pivot pin out sideways. If it is difficult to remove, tap it out with a hammer and punch.
As you pull out the lever, a small spring will fall from between the lever and the body. This keeps the lever resting against the cam when the pump is idling – that is, when the carburettor is full and no petrol can be delivered.auto oil seals. The diaphragm stays down and the lever moves up and down in the slot.
A one-piece SU valve unit, seen from below.viton oil seals.A one-piece SU valve unit, seen from below.AC-Delco pumps sometimes have a two-piece lever to allow idling, but there is still a spring. Remove the lever on this kind of pump too, so that you can clean it.crankshaft auto oil seals Good quality.
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