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Thread: measuring valve clearnance

  1. #1
    Join Date
    Nov 2005
    Posts
    121

    Default measuring valve clearnance

    When setting valve clearances, does anyone know if there is an equivalent measurement between the cam and rocker versus the valve and eccentric? The rockers are unequal so the clearance between the cam and rocker versus the valve and eccentric will be slightly different, was wondering if anyone knew if you could set clearances by measuring at the cam instead of the eccentric.

  2. #2
    Join Date
    Apr 2007
    Location
    Ridgecrest CA
    Posts
    66

    Default

    beetos,this is a great questio and hopefully some of the engine gurus will respond.i just did a valve adjustment on my 2.5 and its not easy to be accurate between the lobe and rocker cause of space issues.sure would be more accurate to measure between eccentric and valve stem. bones

  3. #3
    Join Date
    Jan 2004
    Location
    Albuquerque, NM
    Posts
    953

    Default

    I had read the spec many years ago but forgot where. Simple enough to reverse engineer: Adjust it at 0.012" at the rocker tip and see what the largest size feeler guage will slide in at the cam lobe. Set a few of them at that size at the lobe and see if it still slides a .012 at the valve tip. One thing to consider: since they are probably 1.5:1 +/- rockers, the error will magnify at by that much at the valve tip when making the adjustment measurement at the lobe.
    gale
    92 735i 5-spd, turbo project finally underway!


  4. #4
    Join Date
    Jun 2007
    Location
    Cheshire CT
    Posts
    310

    Default

    You mean that's not where you're supposed to make the adjustment?

  5. #5
    TC535i Guest

    Default

    Why no room? I've always used angled feeler gauges in my 535i, would that help in your case? Just take the size you want off and bend it 90 degrees maybe?

  6. #6
    Join Date
    Feb 2004
    Location
    Wichita KS
    Posts
    180

    Default

    Gale has a good point -- because of the multiplication of the rocker arm, any measurement error you make at the cam end will be multiplied. I'll stick with measuring at the valve end.

  7. #7
    Join Date
    Apr 2007
    Location
    Ridgecrest CA
    Posts
    66

    Default

    karl,so you have allways measured 12ks at the excentric on top of the valve ?

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