Author Topic: 1951 BSA A7  (Read 4208 times)

Offline anjimehra

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1951 BSA A7
« on: 07.01. 2014 06:17 »
Hi

Happy Hew Year to all.

Anybody know the size & no of the engine oil seal ? The bike came as a basket case missing a few parts. Thanks
Anji

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Re: 1951 BSA A7
« Reply #1 on: 07.01. 2014 08:54 »
G'day Anji. The '51 AA7 didn't have one. they were used from '53 I think in the BA7's.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline anjimehra

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Re: 1951 BSA A7
« Reply #2 on: 09.01. 2014 05:35 »
G'day Anji. The '51 AA7 didn't have one. they were used from '53 I think in the BA7's.
Cheers

Thanks muskrat. That makes life alittle easier. Any idea where I can free download a w/s manual for 1951 A 7 ?

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Re: 1951 BSA A7
« Reply #3 on: 09.01. 2014 09:36 »
G'day Anji.
Wiki has a good list of pages to view, you have to join Wiki to download. I just copy and paste into Word.
http://www.bsawiki.co.uk/index.php?title=Chapter_list
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline anjimehra

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Re: 1951 BSA A7
« Reply #4 on: 09.01. 2014 15:28 »
G'day Anji.
Wiki has a good list of pages to view, you have to join Wiki to download. I just copy and paste into Word.
http://www.bsawiki.co.uk/index.php?title=Chapter_list
Cheers

Thanks muskrat. Much obliged
Anji

Offline anjimehra

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Re: 1951 BSA A7
« Reply #5 on: 25.01. 2014 15:07 »
Hi

Does anyone have an exploded view of the 1951 AA7 engine ? Logic says that there must be a bush with collar on the timing side, but this one docent . It has plain bush but thecae itself has a step cast in where the bush sits ( hope that makes sense??).
Anji

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Re: 1951 BSA A7
« Reply #6 on: 25.01. 2014 15:59 »
Hi Anji

not quite sure if I've got this right but if your talking about the timingside bush it does have a collar but the collar goes to the inside of the crankcase so nothing to be seen from the outside except the plain end of the bush.
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

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Re: 1951 BSA A7
« Reply #7 on: 25.01. 2014 20:12 »
G'day Anji.
Hope these help.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline anjimehra

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Re: 1951 BSA A7
« Reply #8 on: 26.01. 2014 07:48 »
G'day Anji.
Hope these help.
Cheers

Thanks Muskrat & Bill

Attaching some photos of the timing side crankcase. Cant see any scope for a flanged bush !! as the crank wont fit inside the cases.
Whats your take on this ?
Anji

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Re: 1951 BSA A7
« Reply #9 on: 26.01. 2014 08:04 »
Yep that's the bush. It's the type that has a steel outer and bronze inner. See how it fits between the two flats in the casing. Do not try to press the bronze bush out as they are sometimes pegged to the outer. To remove just heat the case to about 200 C and it will fall out.
While your there. Behind that screw is the oil retaining ball & spring (anti wet sump valve). Replace them
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online bsa-bill

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Re: 1951 BSA A7
« Reply #10 on: 26.01. 2014 10:36 »
yep thats just as Muskrat states, the bush in my post is the other type used (solid brass/Phosfer bronze) so looks quite different to the one in your case - should of mentioned that *roll*
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

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Re: 1951 BSA A7
« Reply #11 on: 26.01. 2014 20:04 »
And reseat the ball!

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Re: 1951 BSA A7
« Reply #12 on: 26.01. 2014 20:30 »
Good point I missed Trev. I buy two balls *eek*. I use one new one to tap onto the seat and trow it away and use the other new one.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline Marqs1979

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Re: 1951 BSA A7
« Reply #13 on: 28.01. 2014 21:14 »
Good point I missed Trev. I buy two balls *eek*. I use one new one to tap onto the seat and trow it away and use the other new one.
Cheers


I tested this as I have read about on this forum. Glued ball on a rod and used valve grinding compound.

Online chaterlea25

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Re: 1951 BSA A7
« Reply #14 on: 28.01. 2014 22:11 »
HI All,
Be extremely careful when reseating the ball valves  *ex*
I would not grind in one in
The more the seating is hammered / punched / ground the wider the seating becomes
this lowers the spring pressure per sq mm and leads to leakage past the ball  *sad2*

HTH
John
1961 Super Rocket
1963 RGS (ongoing)