Author Topic: BSA B33 Oil Pump  (Read 398 times)

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Tilfordtel

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BSA B33 Oil Pump
« on: 22 January, 2018, 22:34:15 »
I have just removed the sump from my 1949 B33 and a small tube with a spring clip and ball bearing fell out. Any idea how I can refit it? Or where it goes? And which way up the tube goes.
« Last Edit: 22 January, 2018, 23:09:32 by Tilfordtel »

C10

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Re: BSA B33 Oil Pump
« Reply #1 on: 23 January, 2018, 13:07:41 »
there the same as m20 and C models arnt they??     if so, the tube shouldnt fall off, but seeing it has, it wil prob need brazing back on,the tube will only allow ball to go in one way,as bottom end should be flared in to stop ball falling out,,any photos?

Tilfordtel

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Re: BSA B33 Oil Pump
« Reply #2 on: 23 January, 2018, 15:01:01 »
I will add photos tonight, thanks for your help

Tilfordtel

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Re: BSA B33 Oil Pump
« Reply #3 on: 23 January, 2018, 19:10:30 »
Here are some pics

AWJDThumper

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Re: BSA B33 Oil Pump
« Reply #4 on: 23 January, 2018, 19:57:44 »
As long as the tube is not too loose (less than 5 thou clearance), Locktite retaining compound (eg 641) might be suitable for retaining the tube in position. However, don't get it inside the tube!!

C10

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Re: BSA B33 Oil Pump
« Reply #5 on: 24 January, 2018, 06:30:55 »
yes the flared in end is bottom to stop ball falling out, i dont think it has a spring in there holding ball down,ball is just there for when engine stops,ball falls to bottom and seals/holding oil in the pump.   locktight might be ok,but id be worried it might come loose,it would only fall into the sump and oil in sump will fill up to much untill pump picks it up, but motor will blow lot of smoke/to much oil splashing around,         id try find another pump on ebay,or get it brazed back on,but might worp the bottom plate,but prob cheaper to try that before buying another pump,, norm see them on ebay....a few different models used those...

AWJDThumper

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Re: BSA B33 Oil Pump
« Reply #6 on: 24 January, 2018, 07:48:22 »
It won't come loose with the correct Loctite retaining compound used providing the clearance is within the specified limits and the parts are correctly prepared (cleaned) before the compound is applied. If added security is required, it might be possible to centre punch around the edge of the hole so that the pump grips the tube a bit tighter - this would need to be done before the retaining compound sets. I don't know for certain but I assume the tube was originally an interference fit into the pump rather than being brazed/soldered in?

C10

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Re: BSA B33 Oil Pump
« Reply #7 on: 24 January, 2018, 10:32:10 »
yes you are right, they wernt brazed on,      thats a good idea with the centre punch