Gearbox mainshaft "circlip" ???

Classic Norton Commando Motorcycles.

Gearbox mainshaft "circlip" ???

Postby kevbo82 » Wed Aug 01, 2012 11:56 am

The mainshaft on my gear box has, for lack of a better term, a circlip on it right where it comes through the sleeve gear. I don't see this part on old brits parts list, or on any members photos i see on here of gear box tear downs. whats the deal with it? Also seems rather loose on there, like i could pop it off with a flat head and a little pressure.
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Re: Gearbox mainshaft "circlip" ???

Postby L.A.B. » Wed Aug 01, 2012 12:17 pm

kevbo82 wrote:I don't see this part on old brits parts list, or on any members photos i see on here of gear box tear downs. whats the deal with it?


http://www.oldbritts.com/nor_comm_73_10.html
53 060752 Circlip, Clutch Location


The circlip and the cupped washer locate the clutch assembly at the rear (and is the part which often fails if the clutch nut is tightened to the manual's 70 ft.lb. recommendation).

Try searching: "mainshaft clutch circlip"
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Re: Gearbox mainshaft "circlip" ???

Postby Dances with Shrapnel » Wed Aug 01, 2012 12:22 pm

From the looks of it in the photo you should get a new replacement circlip. This is typical.
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Re: Gearbox mainshaft "circlip" ???

Postby kevbo82 » Wed Aug 01, 2012 12:23 pm

ahhh i was looking on the parts list for the gear box for it. Much thanks LAB, i wanted to replace it but couldn't find it on there!
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Re: Gearbox mainshaft "circlip" ???

Postby DogT » Wed Aug 01, 2012 1:06 pm

I kept this note from a while ago, forget who.....The circlip behind the clutch locating washer should be replaced with #15 shown here. http://www.oldbritts.com/1975_g12.html

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Re: Gearbox mainshaft "circlip" ???

Postby pete.v » Wed Aug 01, 2012 1:23 pm

DogT wrote:I kept this note from a while ago, forget who.....The circlip behind the clutch locating washer should be replaced with #15 shown here. http://www.oldbritts.com/1975_g12.html

Dave

+1 Burr side toward the gearbox. 06-8072

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Re: Gearbox mainshaft "circlip" ???

Postby kevbo82 » Wed Aug 01, 2012 1:30 pm

whats the reasoning behind using that one? is the correct way to install to slide it down the shaft until it locks in rather than trying to open it around the shaft? if ya get my drift
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Re: Gearbox mainshaft "circlip" ???

Postby pete.v » Wed Aug 01, 2012 2:08 pm

kevbo82 wrote:whats the reasoning behind using that one? is the correct way to install to slide it down the shaft until it locks in rather than trying to open it around the shaft? if ya get my drift

This is a problem area and when you apply 70ft lb (as recomended)to the clutch center, the stress under load has and will shear the oem clip. Many are reducing to 40 ft lb's at the clutch center nut to remedy this issue.

The 06-8072 clip is more robust and simply does a better job. It is tougher to get on, but that is the nature of the beast. And yes, run it down the shaft.
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Re: Gearbox mainshaft "circlip" ???

Postby Guido » Wed Aug 01, 2012 8:40 pm

If you are going to order one, order 3. Their cheap enough.
You can just slid it down or use a snap ring plier. Harbor freight sell a set for about $3 or $4
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