m20 loose rocker arm?

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  • karussell
    Noobie
    • Nov 2017
    • 1

    #1

    m20 loose rocker arm?

    hey guys my e30 tick has turned into a full out rattle. i check all the valves and they were all in spec except for exhaust valve on cylinder one. it was just slightly too much gap. are the rocker arms supposed to be this loose when fully tightened or is it time for new ones? bought the car with unknown history 5 years ago. haven't really driven it much over the past 3 years. engine idles fine. it has 180k miles on it. thanks.

  • cheffy30
    E30 Enthusiast
    • Sep 2016
    • 1159

    #2
    drive the car more...
    ~~~~~~~~~~~~~~~~~
    '90 325i sedan daily driven
    '85 325e coupe also a daily

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    • TobyB
      R3V Elite
      • Oct 2011
      • 5163

      #3
      well, yes, there is supposed to be some lash.

      Are you saying you can't
      adjust the valve to the (0.010"?) gap at the
      stem that it's supposed to have?

      Many of us have had luck tightening the lash a thou or 2.
      Not too much more, tho.
      t
      now, sometimes I just mess with people. It's more entertaining that way. george graves

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      • digger
        R3V Elite
        • Nov 2005
        • 5911

        #4
        They are supposed to be 0.25mm loose.... shouldn't be loose on the shaft though.

        Some say the stem can get a concave dish so the feeler gauge gives false reading and so they check at the cam lobe to foot adjusting to thinner feeler gauge. I've not seen any really worn valves with such a dish even when the lobe is fubar
        89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

        new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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