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 what tool fits the back bolt for head removal?
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Posted - 10/12/2006 :  20:52:58  Show Profile  Reply with Quote
1)i have blown my head gasket on my 72 norton fasback. i was wondering what tool fits the back bolt that is upside down. i can't find any wrench that fits. all the others have easily come off with 9/16. any thoughts are greatly appreciated. do i have to take the entire cylinder casing off to remove the single bolt?
2) wondering if anyone knows if the generic wideline seats are easy to fit onto a fastback commando frame, and if the mods to make the attachments is an easy job. thanks. stephen in ny 10/12/06


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Posted - 10/13/2006 :  05:37:04  Show Profile  Reply with Quote
The hexagon size is = 1/4" Whitworth.

British Standard Whitworth (BSW) and British Standard Fine (BSF) spanners/wrenches being marked/identified by the bolt SHANK diameter not the hex size,(BSW and BSF using the same hex sizes but the hex size being one size different in relation to the shank size) and even the correct size spanner/wrench could need to be ground down enough to get it between the nut and the barrel.

Also worth noting that that actual nut/stud thread is not Whitworth but 26 tpi CEI (Cycle thread).
Many different thread forms are likely be found on a Commando (SAE [UNF/UNEF/UNC]/Whitworth/BSF/CEI/BA/BSP[Gas]) and some could have been replaced over the years (with metric sizes!!) so it is wise to check as you go.

The 1/4" Whitworth (or 5/16" BSF) jaw size is .525" which is 13.34mm. So one option would be to grind a 13mm spanner/wrench to fit, if Whitworth tools aren't easily available where you live?

Table of Whitworth BS(F) bolt/hex sizes:
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