Gearbox happenings

Discussion in 'Norton Commando Classic Motorcycles' started by BrianG, Jan 10, 2018.

  1. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Looks like it was a good thing I decided to see what the inside of the Norton's gearbox looked like. I guess this means that it's time for a "kit".

    I also found that the layshaft bearing is not of the new type. So roller bearing or new-style caged ball?

    [​IMG]

    [​IMG]
     
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  2. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    "I also found that the layshaft bearing is not of the new type. So roller bearing or new-style caged ball?"

    There is a dumptruck load of discussion on this. Search "layshaft" and read till you fall asleep:D

    Yes, good choice to tear down.
     
  3. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    I'e seen that 1st gear bush cracked like that before. It's a thin delicate bush.
    Never seen the mainshaft sleeve bush(s) do it though.
     
  4. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    So, do these both just push out/in?
    I don't see them listed in the parts lists.
    Are they available for replacement?
     
  5. hobot

    hobot

    Joined:
    Oct 19, 2005
    If one lives daily on a Commando long they know to always have spare first bush on hand and praise the AMC design accident to reach it 'fairly' easy. Real Nortoneers don't bother till only fractured easy picking pieces left. Then just slip in new, button up, carry on. About the only bush that don't usually need dressing/reaming to fit either.
     
  6. pantah_good

    pantah_good VIP MEMBER

    Joined:
    Jul 17, 2015
  7. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
  8. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Yeah! Another project.
    Luckily John Oland lives in my town...
     
  9. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Case crakded.
    Well, what a surprise!

    [​IMG][​IMG]

    Local wisdom is clean the case thoroughly and Loktite the bearings in, and ride it.
     
  10. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Very good news to see. Ready to rock n' roller on. ( Would just leave her in place , as it is a tight enough heat/cold interference fit already to not need to heat case and drop out the bearing again ). Hopefully that is just a ding mark to the shell in between the 2 bearing bores. No biggie even if it is a crack unless aggressive racing in the future. Good news.
     
  11. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    So I pushed the new bushings into the 4th-main gear sleeve and they are too tight to slip onto the main gear shaft. This implies boring or reaming.

    The main shaft measures 0.81"5. The closest reamer is 13/16 which is 0.825". 0.010 bushing clearance seems like a lot.

    Comments on appropriate clearance for bushings in this gearbox?
     
  12. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    How did you get the bushings into the sleeve gear ? When I rebuilt my box , I used a socket to knock out the old and knock in the new ones ( frozen). But they got tougher to fit inside the gear to the end of the tappings . So the final 2 taps were tight ones and I think this caused the final bush to "flare" inwards a slight bit, my fingernail snagged on it to prove my suspicion. Because the mainshaft would not enter at that end ,but would on the other that was not tapped. So this could be it. I dressed the flared thin snag with a round file and the mainshaft had it's sliding fit just fine. Up to you but check.
     
  13. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    I heated the gear and froze the bushing and then used a hand press to push in the bushings. This press holds the bushing/bearing square to the gear and a gentle pull on the lever smoothly slides the bushing into place without any hammering.

    The bushing in the lay first gear pressed in the same way and fits the shaft.



    [​IMG]

    Normal clearance please.
     
  14. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Nice tool and looks affordable.
     
  15. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Some bushings slide in and fit on the shafts right off. Some need a little persuasion.

    [​IMG]

    Some need a little help to remove.

    [​IMG]

    Almost ready to start the reassembly process.

    New bearings and bushings, seals and o-rings, shifter pawl spring, kickstarter pawl, clutch release arm, and gaskets and I think we might be ready to go.
     
    Last edited: Jan 21, 2018 at 12:00 AM

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