valve adjustor nut, locking vs self lock - NCRS Discussion Boards

valve adjustor nut, locking vs self lock

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  • Jerry G.
    Extremely Frequent Poster
    • March 31, 1985
    • 1022

    valve adjustor nut, locking vs self lock

    Just doing the valve adjustment on the race car before Monterey and I'm currious. The stamped rocker manufacterer included self locking friction nuts to adjust lash. In the past I've used adjusting nuts with a set screw. Think kool nuts by Crane. In a racing application do we have any opinions on one design vs the other. it sure is easier to adjust the lash with the self locking. jerry
  • Jim L.
    Extremely Frequent Poster
    • September 30, 1979
    • 1806

    #2
    Re: valve adjustor nut, locking vs self lock

    Jerry,

    Some manufacturers of rocker studs, ARP comes to mind, recommend against the use of self locking nuts with their rocker studs.

    I'd go with the PolyLoks, myself.

    Jim

    Comment

    • Clem Z.
      Expired
      • December 31, 2005
      • 9427

      #3
      Re: valve adjustor nut, locking vs self lock

      back in the day we used self locking nuts BUT we used "PAL" nuts on top of them to make sure they did not move on race engines. the posi locks have one advantage they are tall enough to make the oil from the push rod hit them and run down onto the rocker ball. i have seen if you don't have the "drippers" in the rocker covers the oil will overshoot the rocker ball and will cause them to burn. http://webcache.googleusercontent.co...&ct=clnk&gl=us
      Last edited by Clem Z.; July 26, 2010, 02:40 PM.

      Comment

      • Joe C.
        Expired
        • August 31, 1999
        • 4598

        #4
        Re: valve adjustor nut, locking vs self lock

        Originally posted by Jerry Gollnick (8575)
        Just doing the valve adjustment on the race car before Monterey and I'm currious. The stamped rocker manufacterer included self locking friction nuts to adjust lash. In the past I've used adjusting nuts with a set screw. Think kool nuts by Crane. In a racing application do we have any opinions on one design vs the other. it sure is easier to adjust the lash with the self locking. jerry
        If you use any brand of "Poly Locks", make sure that you turn the Allen setscrew and the 5/8" adjuster nut the final 1/4 turn AT THE SAME TIME for a positive lock. If you adjust your lash with the nut, and then turn/lock the Allen setscrew afterwords, this is often (but not always) enough force to cause the set screw to deform the top of the rocker stud for a positive lock. If course, your rocker studs are probably screw in type, with shoulders for guide plates, which all have flat tops for the set screws to dig into.
        Last edited by Joe C.; July 26, 2010, 05:47 PM.

        Comment

        • Jerry G.
          Extremely Frequent Poster
          • March 31, 1985
          • 1022

          #5
          Re: valve adjustor nut, locking vs self lock

          With poly locks i usually get the lash then back the nut off a 1/8th turn then hold the nut and turn in the set screw until it touches the stud. Then I turn them both the last 1/8 turn. This puts a preload on the set screw. Seems to work until I forget to tighten one set screw. This just happened to me at the Portland race. ( bent pushrod and all) You can't make this mistake with the self locking but the concern is that they will walk out. So Clem's old racer trick is the Pal nut. Now I guess I can worry about the Pal Nut loosening and going into the pan. Makes you crazy sometimes.

          Comment

          • Jerry G.
            Extremely Frequent Poster
            • March 31, 1985
            • 1022

            #6
            Re: valve adjustor nut, locking vs self lock

            Clem, do you torque the Pal down so it doesn't loosen?? Jerry

            Comment

            • Joe L.
              Beyond Control Poster
              • January 31, 1988
              • 43198

              #7
              Re: valve adjustor nut, locking vs self lock

              Originally posted by Jerry Gollnick (8575)
              Just doing the valve adjustment on the race car before Monterey and I'm currious. The stamped rocker manufacterer included self locking friction nuts to adjust lash. In the past I've used adjusting nuts with a set screw. Think kool nuts by Crane. In a racing application do we have any opinions on one design vs the other. it sure is easier to adjust the lash with the self locking. jerry
              Jerry-----

              GM recommends the self-locking type nut over all other types when using with stamped steel rockers arms. I do, too. This applies to both street and racing applications.
              In Appreciation of John Hinckley

              Comment

              • Clem Z.
                Expired
                • December 31, 2005
                • 9427

                #8
                Re: valve adjustor nut, locking vs self lock

                Originally posted by Jerry Gollnick (8575)
                Clem, do you torque the Pal down so it doesn't loosen?? Jerry
                just snug them up and never lost one. don't you have magnets epoxied in the heads to catch the pieces of valve spring that chip off and cause the small scratches you see on the cylinder walls ??

                Comment

                • Clem Z.
                  Expired
                  • December 31, 2005
                  • 9427

                  #9
                  Re: valve adjustor nut, locking vs self lock

                  Originally posted by Jerry Gollnick (8575)
                  With poly locks i usually get the lash then back the nut off a 1/8th turn then hold the nut and turn in the set screw until it touches the stud. Then I turn them both the last 1/8 turn. This puts a preload on the set screw. Seems to work until I forget to tighten one set screw. This just happened to me at the Portland race. ( bent pushrod and all) You can't make this mistake with the self locking but the concern is that they will walk out. So Clem's old racer trick is the Pal nut. Now I guess I can worry about the Pal Nut loosening and going into the pan. Makes you crazy sometimes.
                  to do poly locks set the valve .003 loose,tighten the set screw while holding the adjustment nut and then turn the adjusting nut to the final lash setting. this will cause the lock screw to bite into the top of the stud

                  Comment

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