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Valve adjustment problem: can't read shim numbers

Discussion in 'XJ Technical Chat' started by Sabre, May 28, 2012.

  1. Sabre

    Sabre Member

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    Following bigfitz' excellent pictorial instructions I was able to determine my valve clearances and remove the shims for the valves that were out of spec, which was five out of eight of them.

    The problem I am having is on some of the shims the middle number is illegible, and just has a dot between the first and third digit. For example, cylinder #1's exhaust valve, which has a measured clearance of 0.07mm, has a shim that reads 2●0. I thought maybe the ● was Yamaha-speak for "0", but using bigfitz chart for that valve clearance, there is a blank space for shim number 200.

    What gives?
     
    Sabre, May 28, 2012
    #1
  2. mlew

    mlew Well-Known Member

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    It happens sometimes, the numbers get worn off. The only way to tell is to get a micrometer and measure them.
     
    mlew, May 28, 2012
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  3. pbjman

    pbjman Member

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    Another option would be to put a different shim of known thickness into that spot and re-measure the clearance.
     
    pbjman, May 28, 2012
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  4. Sabre

    Sabre Member

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    So simple, it's genius!

    There were two out-of-spec valves I could read the shims from. I could just swap them in and re-measure, right? Is there any issue with turning the engine over without a shim in the valve I remove it from?
     
    Sabre, May 28, 2012
    #4
  5. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Yes - don't risk scratching the cam lobe - you would need an extra shim.
     
    TIMEtoRIDE, May 28, 2012
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  6. Sabre

    Sabre Member

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    Bummer. An extra shim is still a lot cheaper than a decent micrometer, though.
     
    Sabre, May 28, 2012
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