The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: harley1450 on 19.03. 2015 18:48

Title: barrel for a10
Post by: harley1450 on 19.03. 2015 18:48

hi  im looking for a replacement barrel for my  a10 motor, mine has several broken fins .. would like to keep as is so looking for a thin flanged one ; theres one on ebay with a bore of 70. 48, but not sure what overbore this is any ideas people, also are all a10 barrels interchangable .thanks curly ...

Title: Re: barrel for a10
Post by: muskrat on 19.03. 2015 19:05

G'day harley1450. All A10 barrels are interchangeable, big/small fin, thin/thick flange. Why nog get your fins repaired? I just got 3 fins repaired for $80. Just need to find a donor.
Cheers

Title: Re: barrel for a10
Post by: harley1450 on 19.03. 2015 19:25

Cheers for that Muskrat, had thought about repair but they are broken almost at the main casting, so not to sure if i can find a cheap doner i would have a go nothing to loose..

Title: Re: barrel for a10
Post by: Rocket Racer on 20.03. 2015 06:55

There must be some Brit members with a dead donor barrel but if you get stuck I've got quite a few donor big "fins" from a barrel on the shelf and can send one back to the motherland of beesa's; might pay to post an image of the barrel showing the missing fin (s?)

Title: Re: barrel for a10
Post by: harley1450 on 03.05. 2015 18:10

Have just got a scrap barrel, and will be attempting to repair mine ........ next problem how do you check if oil pump is working ok when engine is stripped, ive had it apart and cleaned it and it looks fine but it is not free turning like i would expect it to be .... any ideas please .... Curly..

Title: Re: barrel for a10
Post by: bsa-bill on 03.05. 2015 18:27

Quote

ive had it apart

that would do it

little cogs need to marked somehow before taken out, they need to go back as they came out to spin free.
However I have done the same and although stiff at first it seemed to free up after a while and has covered many miles since

Title: Re: barrel for a10
Post by: harley1450 on 03.05. 2015 20:03

Hi Bill
you say yours was tight at first, but could you turn it by hand on the bench ....mine i cant ..
curly.

Title: Re: barrel for a10
Post by: Rocket Racer on 03.05. 2015 20:44

Quote from: harley1450 on 03.05. 2015 20:03

Hi Bill
you say yours was tight at first, but could you turn it by hand on the bench ....mine i cant ..
curly.

A mate is just fitting an SRM pump and the paperwork with that mentions it is only free turning while the engine turns forward. The worm gear will typically creep up the body if rotated backwards. But forwards it should be free turning. Unless it is keep it on the bench.

Title: Re: barrel for a10
Post by: muskrat on 03.05. 2015 21:09

I find if you do the screws up finger tight and spin the shaft then tighten the screws little by little whilst spinning the shaft. A good dose of light oil helps. Spin only in the direction it works and once done it should spin easy with your thumb.
Cheers

When asking a ? not related to the topic please start a new topic in appropriate board.

Title: Re: barrel for a10
Post by: edboy on 03.05. 2015 22:09

i would strip the gears as metal can become inbeded in them and also check for burghs around the drive casting