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Another convert to RTV in the primary case

Discussion in 'Norton Commando Motorcycles (Classic)' started by concours, Apr 8, 2019.

  1. concours

    concours VIP MEMBER

    Dec 29, 2011
    On behalf of my Beezer ridin buddy Mike, I post for your pain/pleasure, images of a for-real oil seal, swaddled with copious amounts of RTV, spread with a butter knife.....
    Last edited: Apr 8, 2019
    MikeG likes this.
  2. concours

    concours VIP MEMBER

    Dec 29, 2011
  3. kommando


    May 7, 2005
    Hope he is adding a chain tensioner ;)

    Looking at the thickness of the bolts and nuts, if they clear the clutch then there is room for thicker alloy plate on the inside with O ring grooves for sealing and threaded holes joined together with countersunk headed screws. No need for the RTV then and if the O ring is lubricated the gearbox can be adjusted.
  4. MikeG


    May 31, 2012
    There is plenty of clearance for what you suggest, and not a bad idea should I do it again, but I would probably tap the plate and thread the screws in from the back rather than countersink. Clearance at the back side is pretty tight. As far as chain adjustment, the amount of travel is surprisingly small at the mainshaft. I took over an inch of play out of the primary chain without any noticeable distortion or cracking of the RTV. I considered bonding a gasket to the inner steel plate but figured it would eventually oil soak and weep/seep/spew-whatever the proper term, and cause me to go in again. At least with RTV all I have to do is pull the clutch and give it another smear rather than pull the entire cover.
  5. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Dec 3, 2012
    If you can't get it to seal then all it needed was a trepanned small section O-ring groove in the inner primary cover for the disc to seal against.

    Or just get the later cover.


    You can put a suitable section O-ring into the felt holder to preload the (new) felt.
    Last edited: Apr 9, 2019

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