20-06-2019, 11:07 PM
(This post was last modified: 20-06-2019, 11:13 PM by David Stepney.)
John,
On re-reading my previous post, perhaps I should have mentioned that the pump operating lever is articulated in such a way that it can only pull the diaphragm down. If the pump is idling, there is a separate spring in the very bottom of the pump which bears on a lug on the part of the arm in contact with the camshaft to ensure that it always bears on the cam, so that the pump is not noisy in operation.
The handbook gives a good if somewhat prolix description of the pump with a detailed drawing of its internals. If you haven't got a handbook, the A7CA archive site has several to cover most models.
David.
Bob.
The 'T' type pump has a bell shaped top cover. The 'U' type pump has a fatter body and a slightly domed top cover. I would put photos up but it is too dark in the garage for successful photography!
On re-reading my previous post, perhaps I should have mentioned that the pump operating lever is articulated in such a way that it can only pull the diaphragm down. If the pump is idling, there is a separate spring in the very bottom of the pump which bears on a lug on the part of the arm in contact with the camshaft to ensure that it always bears on the cam, so that the pump is not noisy in operation.
The handbook gives a good if somewhat prolix description of the pump with a detailed drawing of its internals. If you haven't got a handbook, the A7CA archive site has several to cover most models.
David.
Bob.
The 'T' type pump has a bell shaped top cover. The 'U' type pump has a fatter body and a slightly domed top cover. I would put photos up but it is too dark in the garage for successful photography!