Crank won't fully turn

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  • goldtl
    Noobie
    • Oct 2009
    • 19

    #1

    Crank won't fully turn

    After replacing the waterpump, i tried starting the car. it started to crank then stops. Now it won't turn at all...actually, it will turn over by the using a large nut on the crankshaft pulley and it only turns a little bit. It stops in the same position each time when going in different directions.

    I thought it was a washer that i dropped into the timing belt area but i took that out and it still does it.

    What could be the problem?
    sigpic
  • jlevie
    R3V OG
    • Nov 2006
    • 13530

    #2
    Given the recent work, I'd suspect that the cam timing is wrong and a valve and piston are meeting.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

    Comment

    • MR 325
      Moderator
      • Oct 2003
      • 37827

      #3
      Did you remove or change the timing belt?
      BimmerHeads
      Classic BMW Specialists
      Santa Clarita, CA

      www.BimmerHeads.com

      Comment

      • karel
        Wrencher
        • May 2010
        • 234

        #4
        as the 2 previous guys said.. check the timing..

        a tip.. everytime you do anything with the cambelt check that the engine goes a full cycle with a rench..
        https://www.facebook.com/karelsilhamotorsport/

        Comment

        • goldtl
          Noobie
          • Oct 2009
          • 19

          #5
          i believe that you guys are right...the washer most likely caused the belt to jump/skip a few teeth. What is the likely hood of that causing damage to the head?
          sigpic

          Comment

          • jlevie
            R3V OG
            • Nov 2006
            • 13530

            #6
            The possibility exists, but since the engine hasn't run there's a chance that the valves are okay. Re-time the cam and see how it runs.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

            Comment

            • goldtl
              Noobie
              • Oct 2009
              • 19

              #7
              I took the valve cover off and found 1 broken rocker arm. I've taken the timing belt off, turned the cam a few degrees, but the crank still gets stuck at the same spot. Could a damaged valve be causing the crank to fully turning?
              sigpic

              Comment

              • jlevie
                R3V OG
                • Nov 2006
                • 13530

                #8
                With the timing belt off, the engine won't turn through a full revolution as some of the valves will be open. The easiest way to fix the broken rocker and the cam timing issue is to pull the head.
                The car makes it possible, but the driver makes it happen.
                Jim Levie, Huntsville, AL

                Comment

                • goldtl
                  Noobie
                  • Oct 2009
                  • 19

                  #9
                  gotcha...thanks for your help!
                  sigpic

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