Author Topic: a10 fork oil seals  (Read 3152 times)

Offline huddie

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a10 fork oil seals
« on: 18.06. 2008 17:47 »
hi seems like a daft question, but having purchased my a10 as a basket case, i am looking at the oil seal holder and wondering which way up the seal goes in. can any one advise?

Offline LJ.

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Re: a10 fork oil seals
« Reply #1 on: 18.06. 2008 20:13 »
Very good question! an answer that I too eagerly await for. Unfortunately my seals are in and leaking like B****r. They were brand new seals and brand new fork stanchions. I wish I had asked before fitting and completeing job. Unfortunately untill I strip the front end down again I cant tell you at this moment in time which way is the 'wrong' way.
Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Online bsa-bill

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Re: a10 fork oil seals
« Reply #2 on: 18.06. 2008 21:25 »
In general the open side of the seal ( the side with the spring in it ) faces the oil, this allows oil to exert pressure to the seal forcing the sealing lip onto the shaft ( fork stantion in this case )

there are exception such as when the seal is employed to keep dirt out rather than grease/oil in

All the best - Bill
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline huddie

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Re: a10 fork oil seals
« Reply #3 on: 19.06. 2008 09:05 »
Thanks Bill I owe you a pint. Next question i guess is  how to apply pressure to the exposed side of the seal to push it into the holder and against the stop. Any suggestions? and thanks again for your help. Regards Huddie

Offline Beezageezauk

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Re: a10 fork oil seals
« Reply #4 on: 19.06. 2008 20:16 »
Hi Huddie,

See if you have a socket with an outside diameter just slightly less than the inside diameter of the oil seal holder.

I use an old cover from the rear suspension unit of a plunger model.  It needed  reducing slightly in diameter but only took a couple of minutes with a file.

Unfortunately, not everybody has one of these to hand but a suitable socket will do the job ok.

BTW, dont hold the fork legs directly in the vice to remove the oil seal holders.  They are liable to be squeezed out of shape.  Clamp the brackets that hold the mudguard bridge.

Beezageezauk.

Offline huddie

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Re: a10 fork oil seals
« Reply #5 on: 20.06. 2008 08:44 »
hi beezageza
Thanks, haven't got one but i'm off to the local motorfactors to get one. Thanks for replying.
regards huddie

Offline A10Boy

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Re: a10 fork oil seals
« Reply #6 on: 26.06. 2008 08:34 »
The BSA manual says to put a couple of winds of string around the threads to stop oil leaking from the bottom of the holders.

In the old days we used hemp for that kind of thing, maybe its worth putting a bit of PTFE tape on the theads to be sure, dont forget to wind in in the direction of the thread.
Regards

Andy

1960 A10 - Black Golden Flash
Plus
1974 Kawasaki Z1a
Yam XJR 1300

Offline huddie

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Re: a10 fork oil seals
« Reply #7 on: 26.06. 2008 08:39 »
Thanks a10boy. Didn't think of that, to late now,all assembled. So far so good!!

Offline LJ.

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Re: a10 fork oil seals
« Reply #8 on: 26.06. 2008 11:03 »
Quote
The BSA manual says to put a couple of winds of string around the threads to stop oil leaking from the bottom of the holders.

I couldn't see the point of this because the holders would then over flow when they filled up. And in any case, If I had had my A10s back then in the sixties, the Hemp would have been smoked!  *lol*
Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Offline Beezageezauk

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Re: a10 fork oil seals
« Reply #9 on: 26.06. 2008 20:52 »
Hi again Huddie,

Glad to see you got your forks built up again.

Yes, it is possible for the oil to weep passed the threads of the oilseal holders.  That was the reason for using the hemp.  However, moving with the times, I use a dab of silicon sealant on the threads. 

Please don't tell the purists.

Beezageezauk.

Offline beezalex

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Re: a10 fork oil seals
« Reply #10 on: 26.06. 2008 22:08 »
The BSA manual says to put a couple of winds of string around the threads to stop oil leaking from the bottom of the holders.

An O-ring at the base of the threads works just fine.
Alex

Too many BSA's