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Re: 48' B31 head repair? [Re: Magnetoman] #736908
05/29/18 7:55 am
05/29/18 7:55 am
Joined: Aug 2014
Posts: 1,502
OZ
Triless Online content
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Triless  Online Content
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Joined: Aug 2014
Posts: 1,502
OZ
MM, I don't think "Stilsons" or multi grips was meant here. A ring spanner with a segment cut out is known as a flare nut spanner. The cut out gives access over the pipe to enable the business end to be located on the nut that locates the assembly (as in a brake pipe, fuel pipe, etc.) onto a union.

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Re: 48' B31 head repair? [Re: Triless] #736952
05/29/18 3:05 pm
05/29/18 3:05 pm
Joined: Nov 2011
Posts: 4,429
U.S.
Magnetoman Offline

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Magnetoman  Offline

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Joined: Nov 2011
Posts: 4,429
U.S.
Originally Posted by Triless
MM, I don't think "Stilsons" or multi grips was meant here. .
On re-reading the post it seems you're right. However, 'pipe wrench' and 'flare nut wrench' are not interchangeable terms even in popular usage. If you google images of 'pipe wrench' in the U.S. you will find many pages of "Stilsons" without a single flare nut wrench. Also, flare nut wrenches (spanners) usually have six flats as well as considerably thicker cross sections than ring spanners, which almost always have 12 points. So cutting a gap in a ring spanner will give you a weak substitute for a flare nut wrench that is likely to spread and round off a nut that was on so tight that an open-ended spanner was insufficient.

Re: 48' B31 head repair? [Re: dean toensing] #737533
06/03/18 2:50 pm
06/03/18 2:50 pm
Joined: Nov 2011
Posts: 126
Northern Ireland
B
B31 Ally Offline
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B31 Ally  Offline
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B
Joined: Nov 2011
Posts: 126
Northern Ireland
Any B31 head studs I used to work on I get two open end spanners or three if there is enough hexagon left to fit them on to and use them all at once on the stud. Different makes of spanners sit at slightly different positions in you hand when your loosening the stud but it works for me every time and I haven't had one slip yet. Early B31's had a smaller hexagon on the studs than the later ones. What I eventually did was get some 5/8 thick steel plate and made two spanners for the head studs, milling the jaw gap was crucial to a good fit on the stud but it worked a treat.

Re: 48' B31 head repair? [Re: dean toensing] #737537
06/03/18 3:38 pm
06/03/18 3:38 pm
Joined: Aug 2015
Posts: 1,133
Bolton Lancs UK
A
Andy Higham Offline
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Andy Higham  Offline
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A
Joined: Aug 2015
Posts: 1,133
Bolton Lancs UK
On my B31 fitted with Goldie head and barrel I drilled the head all the way through and fitted through studs with nuts on top of the head. OK not much use to you but it is a more satisfactory arrangement


1955 BSA B31 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
Re: 48' B31 head repair? [Re: dean toensing] #737856
06/06/18 1:11 pm
06/06/18 1:11 pm
Joined: Nov 2015
Posts: 130
boerne texas
D
dean toensing Offline OP
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dean toensing  Offline OP
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D
Joined: Nov 2015
Posts: 130
boerne texas
Used the double wrench technique, worked great!

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