Gear shift lever oring size?

I replaced it when I rebuilt the gearbox about 500 miles ago. It has a small weep and leaves a streak down the gearbox. I have read there are xrings that may create a better seal. Anyone know the original size of the oring and/or the correct size xring seal to get for this application?

Also, I don't recall if I used any type of sealant on the oring. Is there a recommendation if I get a standard oring to replace it?

I am not really interested in sending the cover out for a mod to use a proper oil seal.

Thanks,

jon

Copied from earier post;

"You can get a seal that will fit into the o-ring groove. Look to your local o-ring/oil seal dealer and ask for a "9815" seal. $5 to $6. The dimensions are 1"id x 1.25" od x .125" width (just like the oring). The trick with this, which is far less invasive than the alternative, is to heat the housing around the kickshaft bushing (see #3 here http://www.oldbritts.com/1972_g7.html ) and pop the bushing out. I laid a few drops of Red Loctite in the seal/oring shoulder and dropped in the seal. Then chill the bushing to replace as to not disturb the seal. Vwa-la."

pvisseriii said:

Copied from earier post;

"You can get a seal that will fit into the o-ring groove. Look to your local o-ring/oil seal dealer and ask for a "9815" seal. $5 to $6. The dimensions are 1"id x 1.25" od x .125" width (just like the oring). The trick with this, which is far less invasive than the alternative, is to heat the housing around the kickshaft bushing (see #3 here http://www.oldbritts.com/1972_g7.html ) and pop the bushing out. I laid a few drops of Red Loctite in the seal/oring shoulder and dropped in the seal. Then chill the bushing to replace as to not disturb the seal. Vwa-la."

Click to expand...

It appears that you are referring to the kickshaft seal. I am interested in the gearshift seal.

Oops, sorry. There is a seal for that too but a different procedure
Seal 6152.
Gear shift much less problematic.

Orings seem to do better here.

Pawl carrier seal...

Check out the part of the pawl carrier where it passes through the outer cover.
There could be some corrosion that could cause a leak.
Or the O-ring could be 40 years old.

The O-ring is .125" thick and the shaft is .625" outer diameter if you want to try and source a replacement from an auto parts store.
The shaft only rotates a small amount in the cover so a tight O-ring won't be a problem.

drones76 said:

I replaced it when I rebuilt the gearbox about 500 miles ago. It has a small weep and leaves a streak down the gearbox. I have read there are xrings that may create a better seal. Anyone know the original size of the oring and/or the correct size xring seal to get for this application?

Also, I don't recall if I used any type of sealant on the oring. Is there a recommendation if I get a standard oring to replace it?

I am not really interested in sending the cover out for a mod to use a proper oil seal.

Thanks,

jon

Click to expand...

Jon
I have replaced my O-rings with Quad rings. Q-4114 might be what you need for the shifter. Q-4213 for the kickstart shaft. Edit to the post to show correct Kickstart shaft size which should be Q-4214. Apologies for the wrong size.
Regards,
Tom
CNN

CanukNortonNut said:

drones76 said:

I replaced it when I rebuilt the gearbox about 500 miles ago. It has a small weep and leaves a streak down the gearbox. I have read there are xrings that may create a better seal. Anyone know the original size of the oring and/or the correct size xring seal to get for this application?

Also, I don't recall if I used any type of sealant on the oring. Is there a recommendation if I get a standard oring to replace it?

I am not really interested in sending the cover out for a mod to use a proper oil seal.

Thanks,

jon

Click to expand...

Jon
I have replaced my O-rings with Quad rings. Q-4114 might be what you need for the shifter. Q-4213 for the kickstart shaft.
Regards,
Tom
CNN

Click to expand...

Found this site with some dimensions for o-ring/x-rings. Not sure how accurate it is.

http://www.nortonfastback.com/html/mods.html

And here is a site that sells them:
http://www.hydraulicwarehouse.com/p-348-quad-rings.aspx

Here are dimensions for most of the o-rings (quad rings) you would require
for a Norton Commando:

Description ~ I.D. x cross-section : AS568A- Dash #

Tach Drive ~ 1/4"x1/16" : -010
Timing inspection cover~ 1-1/16"x3/32" : -121
Large primary inspection cover~ 1-3/4"x1/8" : -224
Primary oil level screw ~ 3/16"x1/16" : -008
Swing arm - large ~ 1-5/8"x1/8" : -223
Swing arm - small ~7/8"x1/8" : -212
Transmission shifter spindle ~ 1/2"x3/32" : -112
Transmission gear pointer spindle ~ 9/32"x1/16" ?
Transmission sector gear/camplate spindles ~ 5/8"x1/18" ?
Kick start shaft ~ 1"x1/8" : -214
Headlamp bracket ~ 1-3/8"x1/16": -028
Carb face ~ 1-1/8"x1/16" : -024
Carb needle friction ring ~ 1/32"x1/16" ?

My thanks to Derek for this info.

The Norton Tech Digest has a listing of just about all the 0-ring sizes used on a Commando. And the oil seal replacements if you do an upgrade.......
Tech Digests can be bought from the Bracebridge St. Depot....$20.00 ,,,,,money well spent !
www.bracebridge-street.com

Tim_S

I don't have a specific suggestion for the gearshift seal, but I did find an easy cure for the kickstart was to fit a METRIC O ring: 25mm i.d. x 4mm thick. Works well without any sealer.
I had to go metric as there didn't seem to be a suitably thick imperial one. New standard size O rings didn't do the job.
Perhaps the same theory may apply to the gearshift.
Another thought: on another thread on gearbox seals, someone noted that the gearshift rarely suffers from leaks as it is above the oil level. Is your level correct?

Cheers
Martin

MFB said:

I don't have a specific suggestion for the gearshift seal, but I did find an easy cure for the kickstart was to fit a METRIC O ring: 25mm i.d. x 4mm thick. Works well without any sealer.
I had to go metric as there didn't seem to be a suitably thick imperial one. New standard size O rings didn't do the job.
Perhaps the same theory may apply to the gearshift.
Another thought: on another thread on gearbox seals, someone noted that the gearshift rarely suffers from leaks as it is above the oil level. Is your level correct?

Cheers
Martin

Click to expand...

Good point about the oil level in relation to the gear lever. After the run the other day, the level is right below the 'level' hole.

I am thinking I may have pinched the oring when I re-assembled the gearbox last week for another issue.

Thanks all for the responses.

Good point about the oil level in relation to the gear lever. After the run the other day, the level is right below the 'level' hole.

Click to expand...

Its pretty rare for shifter level leaks but I had some there and out kicker shaft and out the DS main shaft for a week or so after I went against my long learned lesion of not filling gb to factory level, to avoid the mess while it sought its real life innate UN-designed level. The gear box o rings are only place I use RTV to back up weep prone areas, ugh, even on expensive machined in kicker upgraded real oil seal, to stifle the weepage from long hot hi rpm flings.