Chain case sliding seal ?

Hi Geoff,

Since there have been no replies so far, I will chip in with what I know from my 650 as I don't think Norton changed anything much along the line.

On mine, the discs are (now) a snug fit onto the case, and with a new felt seal in the middle (seals onto gearbox mainshaft) the oil escaping from the primary is minimal.

Hope this helps,

George. 

...but then again, my chain case doesn't have anything, which is why oil marks my spot everywhere I go. Seriously though, I can't check for you, but I assume the only way to seal properly is with felt.

I honestly couldn't tell you from experience, but I would think the sandwiched option would be preferable, as it:

1. Keeps the felt in place

2. Stops the whole assembly from rattling

3. Prevents the felt from snagging.

Next time I have to take off the inner cover, which hopefully isn't any time soon, I'll make a seal like yours. That would completely cure the oil leaking from my Model 50.

Hi Geoff,

Unless a previous owner assembled the plates wrongly,  there should be a gap of around 1/4" between the plates at the centre where the mainshaft runs. It is into this gap that the felt ring/seal needs to go. A good massaging the seal with grease or a soaking in gear oil helps the seal go in.

When you run the bike, assuming you have an oil tight case, you need just enough oil in the case for the chain to touch at the bottom of the clutch sprocket. Any more will increase the likelihood of oil leaking out somewhere.

When refitting the case outer, dont forget the felt seal on the footrest tube/case spacer or you will have another oil escape route. 

God luck, 

George