The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: wxp on December 30, 2008, 08:37:20 PM

Title: Swing Arm Nut
Post by: wxp on December 30, 2008, 08:37:20 PM

Is there a special socket to rmv swing arm nut & what size is it or do I need to grind one down to fit??

Thanks

Title: Re: Swing Arm Nut
Post by: Justin B. on December 30, 2008, 10:00:13 PM

I don't remember the exact size but it needs to be a very thin-wall socket.  I still had to chuck one up and turn about .050 off it.  If nobody responds I'll check the size tomorrow but I seem to remember 27 mm or 1 1/16" being kicked around.

Title: Re: Swing Arm Nut
Post by: Rob Valdez 79 R65 on December 30, 2008, 10:35:47 PM

27mm for metric.  I don't know about SAE.  I have heard of some fitting w/o mod.

(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.culayer.com%2FJoes%2FTool_2.gif&hash=b7b75e00a7cb7f6cbadefddbb9a5a1e628ae11d9) (http://www.culayer.com/Joes_tools.htm)
Here is one for $12.


You also want to flatten the face for maximum purchase.

Title: Re: Swing Arm Nut
Post by: wxp on December 31, 2008, 07:36:00 AM

I thought that is what I would need to do. Just wanted to double check.

Thanks for the info :)

Title: Re: Swing Arm Nut
Post by: montmil on December 31, 2008, 07:53:57 AM

Quote

27mm for metric.  I don't know about SAE.  I have heard of some fitting w/o mod.

(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.culayer.com%2FJoes%2FTool_2.gif&hash=b7b75e00a7cb7f6cbadefddbb9a5a1e628ae11d9) (http://www.culayer.com/Joes_tools.htm)
Here is one for $12.


You also want to flatten the face for maximum purchase.

Check these links for Beemer-specific tools:

http://www.culayer.com/Joes_tools.htm

http://www.northwoodsairheads.com/Tools.html

Happy New Year shopping!   Monte

Title: Re: Swing Arm Nut
Post by: Semper Gumby on January 04, 2009, 01:54:18 PM

If memory serves me right     Great Neck 1-1/32 No need to turn but it is a twelve pointer.

Ed Korn's tool site-

http://www.cycleworks.net/

Title: Re: Swing Arm Nut
Post by: nhmaf on January 04, 2009, 04:37:12 PM

One doesn't need to put a huge amount of torque on the swing arm nut, but you DO want it to be well gripped by the socket so as not to round off the corners from having it slip.
As others have said, some standard, unmodified ones have thin enough sidewalls but are often 12 point sockets instead of the 6, so there is a slight possibility of less than perfect grip.   The key thing is to have the end as flat as possible so that the socket slides in and grips as much of the nut surface as possible - a rounded end gives it less purchase.   I sprang for one of Ed Korn's modified sockets as I don't have a lathe available to me, and my ability to do a decent job of grinding a socket uniformly is questionable.

Title: Re: Swing Arm Nut
Post by: trolle on January 09, 2009, 03:54:34 AM

Quote

...   I sprang for one of Ed Korn's modified sockets as I don't have a lathe available to me, and my ability to do a decent job of grinding a socket uniformly is questionable.

An angle grinder can do wonders  :)

greetings from a relatively warm north