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1968 Atlas head bolts #740261
06/29/18 7:40 pm
06/29/18 7:40 pm
Joined: Dec 2006
Posts: 322
Glenwood, Iowa USA
TBolt72 Offline OP
BritBike Forum member
TBolt72  Offline OP
BritBike Forum member
Joined: Dec 2006
Posts: 322
Glenwood, Iowa USA
What size and how the hell do you get at the rear head bolt between the cylinders?? I need to pull the head off.

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Re: 1968 Atlas head bolts [Re: TBolt72] #740270
06/29/18 11:16 pm
06/29/18 11:16 pm
Joined: Aug 2009
Posts: 990
gastonia .. NC
L
limeyrider Offline
BritBike Forum member
limeyrider  Offline
BritBike Forum member
L
Joined: Aug 2009
Posts: 990
gastonia .. NC
That is a 3/8 dia. stud, you WILL need a 5/16 Whitworth or 1/4 BSF ring spanner ( wrench ) to get onto the narrow space, you will get a fractional movement of the nut .... BE patient,
depending on how " beefy " your spanner is , you may need to grind some metal off the outside radius of the spanner to clear the fins around the nut.

HTH..... good luck.

Re: 1968 Atlas head bolts [Re: limeyrider] #740294
06/30/18 9:00 am
06/30/18 9:00 am
Joined: Mar 2006
Posts: 3,771
Norfolk, UK
L.A.B. Online content
BritBike Forum member
L.A.B.  Online Content
BritBike Forum member
Joined: Mar 2006
Posts: 3,771
Norfolk, UK
Originally Posted by limeyrider
5/16 Whitworth or 1/4 BSF


1/4 Whitworth, 5/16 BSF (0.525" jaw size).

http://www.sat.dundee.ac.uk/~psc/spanner_jaw.html#Jaw_Size_Table

Re: 1968 Atlas head bolts [Re: TBolt72] #740306
06/30/18 12:19 pm
06/30/18 12:19 pm
Joined: Dec 2006
Posts: 322
Glenwood, Iowa USA
TBolt72 Offline OP
BritBike Forum member
TBolt72  Offline OP
BritBike Forum member
Joined: Dec 2006
Posts: 322
Glenwood, Iowa USA
I ground down my only 1/4 wrench and was able to get it off. Found a used snap-on replacement wrench on eBay so I guess I'm good for next time.Thanks for the replies.

Re: 1968 Atlas head bolts [Re: TBolt72] #740307
06/30/18 12:25 pm
06/30/18 12:25 pm
Joined: Aug 2001
Posts: 1,279
Hamilton, Mass. USA
D
Dave Comeau Offline

Crew Chief
Dave Comeau  Offline

Crew Chief
D
Joined: Aug 2001
Posts: 1,279
Hamilton, Mass. USA
The raw castings # for the 750 atlas and commando are the same. However it seems to me the later commando seems to fit more box wrenches with out custom relieving for them to fit in the "as cast" barrel. The atlas' I've worked on seem more often than not needing a thinner box wall than the commandos.


dynodave
BSA 3 1961-1963
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Re: 1968 Atlas head bolts [Re: L.A.B.] #740308
06/30/18 12:44 pm
06/30/18 12:44 pm
Joined: Aug 2009
Posts: 990
gastonia .. NC
L
limeyrider Offline
BritBike Forum member
limeyrider  Offline
BritBike Forum member
L
Joined: Aug 2009
Posts: 990
gastonia .. NC
Thanks for the correction L.A.B. ... my mistake, got the sizes transposed in my head !!!.


Moderated by  Dave Comeau 


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