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exhaust valve opens during intake

Discussion in 'Norton Commando Motorcycles (Classic)' started by dlou0338, Feb 8, 2019.

  1. dlou0338

    dlou0338

    Joined:
    Aug 25, 2016
    No unfortunately, as long as you're talking about the tear drop shaped pieces that bolt on under the barrels between the lifters
     
  2. Deets55

    Deets55 VIP MEMBER

    Joined:
    Oct 3, 2013
    Beveled washer is inside of crankcase. Tab washer is in timing chest. General opinion of the tab washer seems to be to remove the tab. Seems to be they are prone to breaking and the pieces travel about the engine causing havoc. I’m confident more knowledgeable guys will supply more info on this.
    Pete
     
  3. dlou0338

    dlou0338

    Joined:
    Aug 25, 2016
    If that's the case that would be the confusion on my part I am farily certain I put tab washer behind the beveled in the crank case so the tab washer goes behind the cam gear then?
     
    Last edited by a moderator: Feb 9, 2019
  4. Deets55

    Deets55 VIP MEMBER

    Joined:
    Oct 3, 2013
    I believe that is the case.
    Bevel washer, crankcase, tab washer, cam gear.
    My engine didn’t have a tab washer, I believe that is because it had a two piece cam bush. In Old Britts parts diagram it is a little hard to see the actual order of assembly. Hang tight someone who knows that engine better than me will gladly help you out.
    Pete
     
    dlou0338 likes this.
  5. dynodave

    dynodave

    Joined:
    May 28, 2003
    Forget what the parts book says:
    Original qty of 062601 is 2, one inside and one outside. failure to put the outer one can exactly cause your problem.

    However anyone that uses the 06-2600/06-2601 system is not up to speed.
    I myself would never use these under pains of death.
    The MKIII bush 2 piece set or the regular single flange 850 one is far superior to the the death inspiring combat set.
    You will however have the cam bearing scrolling problem to resolve.
    Is anyone looking for the EASY button? sorry

    Similar reply to a NOC question:
    NHT single chain engines:

    Camshafts measure from tach thrust washer to sprocket is typically 1.015" (using 1971 NOS 06-1084 norton factory cam).

    Cases are approximately 0.850" thick where the case cam bushes go.

    MKIII cases would use 2 bushes with flanges .0625"=.125" add to case thickness

    regular 850, combat cases, and 20M3s cam bushes with flanges or thrust washers always add up (with the case) to around 0.985". 1/8" end play is to much and indicates a problem.

    So checking your components by measuring them would yield the problem area..032" clearance is typical.
     
    Last edited: Feb 11, 2019
    dlou0338 likes this.

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