Hi

I have not long ago acquired a '56 BSA Shooting Star, which has been 
extensively restored, and I have had it re-bored and fitted new pistons and 
clutch etc. However, when the bike is left standing for several weeks, the 
sump fills up with the oil from the oil tank and if you try to start the 
bike, oil spews from everywhere. I have looked in the various workshop 
manuals and service sheets, and there is reference to a non-return valve 
fitted behind the oil pump on the flow side from the oil tank. I have had 
the oil pump out but have been unable to locate any non-return valve or the 
facility for one. Has anyone any ideas please?

Just bought a 56 gold star to restore. I dont know b.s.a. but an H.D. oil 
pump has a bearing that seats, when its not seating right you have the same 
problem. Hope this helps

url:http://myreader.co.uk/msg/13174798.aspx

In message , john flanagan 
 writes
>Just bought a 56 gold star to restore. I dont know b.s.a. but an H.D. oil
>pump has a bearing that seats, when its not seating right you have the same
>problem. Hope this helps
>
>url:http://myreader.co.uk/msg/13174798.aspx

A common fix is to put an additional valve in the oil line.
-- 
Tim
http://www.pitfieldbeershop.co.uk/

I also have a 1959 Shooting Star with exactly the same problem and have as 
yet not solved it. The only solution I can think of is to replace the oil 
pressure release valve(front RH side of crankcase)on the grounds that it 
could be weak or sticking and see what happens. Are there any other 
non-return valves in the lubrication system?
Any advice gratefully received.
11/01/08

url:http://myreader.co.uk/msg/13174798.aspx

Thus spake Norman Robert Leslie (postmaster@normanleslie.plus.com) unto the assembled multitudes:
> I also have a 1959 Shooting Star with exactly the same problem and have as 
> yet not solved it. The only solution I can think of is to replace the oil 
> pressure release valve(front RH side of crankcase)on the grounds that it 
> could be weak or sticking and see what happens. Are there any other 
> non-return valves in the lubrication system?

They don't need them.  All oil in BSA engines finds its way out eventually,
never to return.

Sorry for facetiousness, but I *have* owned a BSA :-)

-- 
                                 Andy Clews
                            University of Sussex
                 *** Remove DENTURES if replying by email ***

Norman Robert Leslie  wrote:

> I also have a 1959 Shooting Star with exactly the same problem and have as
> yet not solved it. The only solution I can think of is to replace the oil
> pressure release valve(front RH side of crankcase)on the grounds that it
> could be weak or sticking and see what happens. Are there any other 
> non-return valves in the lubrication system?
> Any advice gratefully received.

I'm presuming this relates to oil disappearing from the tank into the
sump?
The oil pump is worn, with the oil leaking past the internal gears in
the pump.
A new pump can sometimes cure it, but it isnt guaranteed.
The return pipe seal, the small ball bearing in the pipe that sucks up
the oil from the sump is also crap at sealing anything, hence with a
worn pump all of the oil will disappear into the sump, along with
anything in the return pipe.

The only sure cure is a small inline tap in the oil feed pipe. These are
quite accessible, so a small tap can easily be fitted. Probably an 8mm
inline tap like this:
<http://www.screwfix.com/prods/23550/Plumbing/Gas-Fittings/Mini-Lever-Ba
ll-Valve-8mm>

The downside is that you must remember to turn it on every time you
start the bike.
Alan.


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