getting head resurfaced

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  • Dirty325ix
    Mod Crazy
    • Sep 2012
    • 689

    #1

    getting head resurfaced

    So i am getting my m20 b25 head resurfaced and i was wondering if there is any way to make all the valves sit below the surface of the head without taking out the cam
  • Cabriolet
    R3V OG
    • Apr 2010
    • 9620

    #2
    Originally posted by Dirty325ix
    So i am getting my m20 b25 head resurfaced and i was wondering if there is any way to make all the valves sit below the surface of the head without taking out the cam
    yes, just knock the rockers out of the way. they slide when the clips are removed.
    Last edited by Cabriolet; 04-17-2013, 07:49 AM.
    Much wow
    I hate 4 doors

    Comment

    • jlevie
      R3V OG
      • Nov 2006
      • 13530

      #3
      Unless this is a really low mileage head, like less than 50k, it would be a good idea to have the valves ground and new seals installed while the at the shop for surfacing.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

      Comment

      • Dirty325ix
        Mod Crazy
        • Sep 2012
        • 689

        #4
        he cant regrind the valves at his shop but he said he maybe able to send them away....for a fee
        so once I take the clips off and loosen the rockers I can just pull the valves out.
        how to you take the seals out/ replace them...just poke it out and push a new one back in

        Comment

        • jlevie
          R3V OG
          • Nov 2006
          • 13530

          #5
          To grind the valves the head must be stripped down to the casting. Both the valves and the seats must be ground.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

          Comment

          • dnguyen1963
            R3VLimited
            • Nov 2011
            • 2648

            #6
            Google it...there are many good videos showing you how to grind the valves & seats.

            Comment

            • digger
              R3V Elite
              • Nov 2005
              • 5912

              #7
              what you do dont lap them except lightly to check the contact. lapping is not for fixing irregularities
              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

              Comment

              • MR 325
                Moderator
                • Oct 2003
                • 37825

                #8
                Originally posted by Dirty325ix
                he cant regrind the valves at his shop but he said he maybe able to send them away....for a fee
                so once I take the clips off and loosen the rockers I can just pull the valves out.
                how to you take the seals out/ replace them...just poke it out and push a new one back in
                So this shop has a resurfacing machine but can't grind valves?

                Find a new machine shop and do it right!
                BimmerHeads
                Classic BMW Specialists
                Santa Clarita, CA

                www.BimmerHeads.com

                Comment

                • Dirty325ix
                  Mod Crazy
                  • Sep 2012
                  • 689

                  #9
                  Originally posted by MR 325
                  So this shop has a resurfacing machine but can't grind valves?

                  Find a new machine shop and do it right!
                  I live in a super small town and the city is 4 hours away

                  Comment

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