Inner primary chaincase sealing disc has "cup" part I cannot locate on parts diagrams.

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Jdub

Jdub

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Hi all - I am in the process of drilling out the old oil retention plates and replacing both with felt. However, the picture below shows a cup that I have not seen before nor have I found on parts diagrams. That's Norman in the pic below.

Should I retain this item? Thanks for educating me on this!

Inner primary chaincase sealing disc has "cup" part I cannot locate on parts diagrams.
 
Thank you! Is there a general opinion about its usefulness?

I may try to rivet these plates as I have seen others do unless tack welding is the better approach. Very tempted to waste one of my felts in an attempt to get a new one in using dental pick.
 
Jdub said:
Very tempted to waste one of my felts in an attempt to get a new one in using dental pick.
Click to expand...
With difficulty you can get them in without removing the plates. Some will tell you it's easy - that's not me! If you saturate the felt with grease or heavy oil then press it in a vice, it's much easier to get started but then it grows in diameter, so you have to pack as you insert. The last bit can be very difficult. I do use a dull dental pick.
 
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Jdub said:
Hi all - I am in the process of drilling out the old oil retention plates and replacing both with felt. However, the picture below shows a cup that I have not seen before nor have I found on parts diagrams. That's Norman in the pic below.

Should I retain this item? Thanks for educating me on this!

View attachment 85956
Click to expand...
Is there any indication the oil deflection flange proved useful? For me that would decide whether to try and sandwich it back in there.
 
I think the plate is sometimes referred to as a slinger, although it does not rotate and therefore cannot sling oil . It does direct oil around the transmission shaft and may help reduce oil escaping thru the shaft hole and past the felt seal.
I have found the best seal is to install a lip seal on the inside disk.
Use the search function....there have been other threads on this subject.

Slick

Edit: Mar 21,'20 Look here for a "how to" about a lip seal
www.accessnorton.com

The Last Leak

The last leak on my Atlas succumbed to a lip seal on the transmission shaft where it passes thru the sliding discs. My method: Separate the sliding disks, and invert the inner disk. This puts the felt washer pocket towards the clutch basket. Inside that pocket, I JB Welded a shaft grease seal...
www.accessnorton.com www.accessnorton.com

scroll down to reply #17 for another take on a lip seal.
 
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Thanks again. Tried Search on this item but without a part number or name it was difficult. Should have checked parts list addendum for this little beauty. Can't speak on the usefulness as I purchased this bike to strip and rebuild so never rode it.

By the way, this is the primary chaincase that had the built-in tensioner: https://www.accessnorton.com/Norton...-device-in-my-mk2-chaincase.26840/post-403169. Lots of fun on this bike!
 
@Jdub Why are you drilling it out? It is easy enough to replace the felt seal.

Method for installing new felt seal on inner primary cover.(2020)

I’m new to this site and to Commando’s but not new to British and other bikes. I’m sure this question has been asked before – just need to learn how to search. I’m ready to install the inner primary cover on my Commando. I am confident in my shim determination. I have a new felt seal for the...
www.accessnorton.com www.accessnorton.com
 
Drilling out on the advice give in Norman White's restoration book. However, I can see that the seal could be inserted so reconsidered and attempted to push a fully-oiled new felt item in. No luck.
 
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BERT said:
Is there any indication the oil deflection flange proved useful? For me that would decide whether to try and sandwich it back in there.
Click to expand...
I replace the clutch basket bearing with a sealed one - that eliminates the oil path into the clutch from the back - not sure where they were thinking they were deflecting the oil from...
 
Hi all - I failed in my attempt to get the fully oiled, vise- flattened felt seal in (does this disqualify me from ownership?).

What does the group think about using a silicone rubber O ring, inner of 1 3/16", to seal this instead? I have a near-new clutch basket and bearing so while a sealed bearing is a good plan I don't want to pull this apart for that solution.

A possible O ring solution at the URL below. Tight fit would ensure some degree of sealing and the stray oil would lube. But is it prone to breaking up? Someone I am sure has been down this road - thanks in advance for your thoughts.

 
Jdub said:
Hi all - I failed in my attempt to get the fully oiled, vise- flattened felt seal in (does this disqualify me from ownership?).

What does the group think about using a silicone rubber O ring, inner of 1 3/16", to seal this instead? I have a near-new clutch basket and bearing so while a sealed bearing is a good plan I don't want to pull this apart for that solution.

A possible O ring solution at the URL below. Tight fit would ensure some degree of sealing and the stray oil would lube. But is it prone to breaking up? Someone I am sure has been down this road - thanks in advance for your thoughts.

Click to expand...
At first thought: Good Idea but an x-Ring would be even better. After more thought - not so sure it's a good idea. That shaft is basically dry (or should be). I don't know what would happen with a dry shaft turning at high speed in a rubber seal
 
If I ever take it apart again I'll take pictures but....I took a piece of aluminum and milled it to .150 thick. Cut it the same diameter as the old sheet metal felt holder and milled a slot in it near the outside edge to take a 1/8 inch thick square O ring. Bored a hole in the center to take a double lipped seal that fits the main shaft and made a sheet metal piece to fit on the back side of the inner primary cover. Six 5mm bolts in from the back side hold them together and it's been leak free for the first time since I've owned it. Really wished I had documented it, I got so involved in it I forgot all about the camera.
 
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