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Dominator 88

Discussion in 'Other Norton Motorcycles' started by Andymann, Feb 24, 2020.

  1. Andymann

    Andymann

    Joined:
    Feb 24, 2020
    Apologies for the lack of feedback but understandably with all that's going on I haven't had a chance to get back into the workshop. Nevertheless, I did have a go at the gearbox this weekend. Stripped it and had a very careful look at everything. The innards are in really good shape and I would be lying if I said I found something really obviously wrong. The only thing I could see was that the spring pushing out the locating pin which locks the camplate seemed really stiff which made rotating the camplate quite difficult - even without the innards. I found no literature on if the spring has a certain length or stiffness or if you need to add shims between the cap and the gearbox to alter the stiffness, so I just put it back the way it came out. The other thing was the timing of the camplate and the selector arm (where the ball fits). Some say you need to time it that in 4th Gear the arm lines up with the top right gearbox stud, and others say that at the extremes, the distance from the notch from 1st and 4th need to be the same. I set it up this way, but I haven't finally reassembled the box, so I can change it if there is a more scientific way to get the timing right!
     
  2. dynodave

    dynodave

    Joined:
    May 28, 2003
    Your quoting an AMC gearbox procedure...I though you had a "norton" laydown gearbox?? like in your avatar/pix
     
    Last edited: Mar 23, 2020
  3. Mike40M

    Mike40M

    Joined:
    Jan 18, 2020
    Still have no clue if you have an AMC or a laydown gearbox. Is the inspection cover round (AMC) or oval (laydown)? Makes it a bit harder to try to help.
    According to my notes the camplate plunger spring for the AMC box, part# 040442 is 1.49" long. My notes suggests that a 1.25" long one had been working satisfactory. But here the notes are a bit messy due to some coffee spills.
     
    dynodave likes this.
  4. Andymann

    Andymann

    Joined:
    Feb 24, 2020
    Hi All - definitely a laydown gearbox and using the link sent to me by Bernhard (TIA) https://andover-norton.co.uk/en/shop-drawing/409/laydown-gearbox

    From there, a bit of googling about how to assemble a laydown box and I came up with the two different descriptions on how to set the camplate timing on a laydown.
     
  5. Mike40M

    Mike40M

    Joined:
    Jan 18, 2020
    I believe that your false neutrals and long lever travel is caused by excessive play somewhere between the gearlever and the camplate. Am I correct that the false neutrals appears between all gears? I have a dim memory that there could be a play between the camplate and the gear attached to it. Anyhow worth checking.
    Or possibly not correct shimming of the shafts, allowing axial movements. But here I'm not certain if it was the laydown gearbox that could have that problem. A drawback of playing with Burman, Sturmey Archer, Norton, BSA and Velo gearboxes.
     
    Last edited: Mar 26, 2020

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