Twin oil pump difference

[mshaw]

Hi can any one tell me the difference between a 1958 600cc twin oil pump and a 1961 oil pump and is there any where I can get a explosive view of the 1961 pump

Regards Mike

[SPRIDDLER]

Text and illustration on page 12 et sub here:

http://archives.jampot.dk/book/Workshop ... models.pdf

[Groily]

I don't think there is any difference Mike. In '63 the double-size pumps were introduced, with the fat timing cover, but twins of those years would I am pretty sure have the same. Any of the relevant workshop manuals in the archives will have a pic of the pumps in it I think (but not sure how exploded). 'Seen one, seen 'em all' really.
http://archives.jampot.dk/Book/Workshop_manuals/ - but (edit as we go!) Spriddler's there already!
The things that DID get chopped and changed were the filters and the pressure relief valves (design and location - and elimination altogether for a period).
Pumps that look different do exist however - improved designs such as Rik Gibbons' ones, and other upgrades to include O rings on spindles and oil-tight side-plates. Some of them look really rather tasty compared to the originals.
If you've got a decent pair of the standard items and a mounting plate, I'd sling 'em on without worrying too much. If you haven't got any . . . usable used ones probably can be had from AMC Classic Spares, or one of the other suspects.
If by chance you take them apart ever, I'd be careful to refit each little gear in exactly the same place, same way round, and ditto the end plates and other bits and bobs. Despite often reading about concerns about the lubrication system on these things, I've not had problems with the standard items. One pair of mine have been in continuous use since 1976 and I've never replaced anything in them.

[Samuel]

One pair of mine have been in continuous use since 1976 and I've never replaced anything in them.

Just the oil I assume

[Duncan]

I normally face the end plates off whenever I have a pump apart to minimise any potential leakage around the end of the gears

[Groily]

One pair of mine have been in continuous use since 1976 and I've never replaced anything in them.

Just the oil I assume

Good one! Several hundred times Samuel!