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#710316 - 10/02/17 7:44 pm BSA B50 cylinder head nuts  
Joined: Jun 2015
Posts: 148
richiedan40 Offline
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richiedan40  Offline
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Posts: 148
wales uk
Hi guys , simple one this ok........how the hell do you get the right hand front cylinder head nut off a B 50 ???????????
I cant get any of my spanners on the damn thing , the spanner catches the fins before slipping on , I could grind one down but itll have zero strength to torque up !


1969 BSA A65 Lightning
1994 moto guzzi California
Triumph sprint GT
1971 BSA B50 Victor special
1968 BSA B44 SS
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#710344 - 10/02/17 10:33 pm Re: BSA B50 cylinder head nuts [Re: richiedan40]  
Joined: Dec 2004
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kommando Online content
kommando  Online Content


Joined: Dec 2004
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Scotland
It's an odd size but still AF not whitworth plus you need a slimmed down ring spanner.

#710809 - 10/07/17 7:18 pm Re: BSA B50 cylinder head nuts [Re: richiedan40]  
Joined: Oct 2001
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Ed V Offline
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Ed V  Offline

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Howard City, MI
This will not help you with your head nut removal but we offer nuts that are 1/2" 12pt so you can use a 12 pt 1/2" wrench to assemble with on reassembly. We started using these back in the 90`s on race bikes and many street riders like them also.

#710811 - 10/07/17 8:14 pm Re: BSA B50 cylinder head nuts [Re: richiedan40]  
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DMadigan Online content
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DMadigan  Online Content
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ca, us
You can also use flange base nuts with a reduced 12 point hex to make access easier.
[Linked Image]

#710812 - 10/07/17 8:42 pm Re: BSA B50 cylinder head nuts [Re: DMadigan]  
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Ed V Offline
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Ed V  Offline

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Howard City, MI
Yes, these are the ones I was talking about, thanks for supplying the photo

#710814 - 10/07/17 9:14 pm Re: BSA B50 cylinder head nuts [Re: richiedan40]  
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Andy Higham Online content
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Andy Higham  Online Content
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Bolton Lancs UK
It would have been so easy for BSA to have altered the head pattern slightly and put the right hand head nuts inside the rocker cover


1955 BSA B31 400cc "Stargazer"
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1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
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#710905 - 10/08/17 8:32 pm Re: BSA B50 cylinder head nuts [Re: richiedan40]  
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Tigernuts Online content
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Tigernuts  Online Content
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Naarfuk, UK
11/16" AF ring spanner. If a decent make (ie: not over-thik steel to make up for poor quality), should ft no problem. I have two such spanners which fit my B50's head nut.

Or do you mean the front nut of the outer pair on the right-hand side? If you do mean these, you will need to grind down a flat 9/16"AF ring spanner 9again, good quality, or it will break due to the reduced thickness).

For torquing, you'll need to get nuts welded to your 11/16" and your 9/16" ring spanners at 3" or 4" away from centres of studs and do the calculation that the genuine NSA manual very helpfully spells out.


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#710920 - 10/08/17 9:58 pm Re: BSA B50 cylinder head nuts [Re: Tigernuts]  
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Shane in Oz Online content
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Shane in Oz  Online Content
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Sydney, Oz
Originally Posted by Tigernuts
11/16" AF ring spanner. If a decent make (ie: not over-thik steel to make up for poor quality), should ft no problem. I have two such spanners which fit my B50's head nut.

Or do you mean the front nut of the outer pair on the right-hand side? If you do mean these, you will need to grind down a flat 9/16"AF ring spanner 9again, good quality, or it will break due to the reduced thickness).

For torquing, you'll need to get nuts welded to your 11/16" and your 9/16" ring spanners at 3" or 4" away from centres of studs and do the calculation that the genuine NSA manual very helpfully spells out.


Here in Australia, there was a cranked 11/16 AF spanner with a 1/2" square drive directly above the ring. This was used for tightening the cylinder head bolts directly above the rocker shaft on early Holden motors. This motor was based on a Chev engine, so there was probably a similar spanner in the UK used for Vauxhalls.
It needs to be ground back a little, but unit single head bolt torques are much lower than cast iron Holden motors.

Alternatively, Motion Pro makes an adapter which clamps a ring spanner and has a 3/8" square drive for the torque wrench.


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