Tach on '66 bouncing around - NCRS Discussion Boards

Tach on '66 bouncing around

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  • Michael J.
    Extremely Frequent Poster
    • January 27, 2009
    • 7118

    Tach on '66 bouncing around

    I am wondering if there is something wrong with my tach on my '66. In reading the judging manuals, they say the tach needle shouldn't bounce around when engine is revved up, points deducted if it does. Mine does, big time. Maybe 1000 rpm of so bouncing as you rev and let off. The tach drive on the distributor sounds fine, no noises, or behind the tach gauge. Is this a lubrication problem or something worse, like a bad tach or tach drive? Thanks for any ideas.
    Big Tanks In the High Mountains of New Mexico
  • Peter C.
    Infrequent User
    • June 30, 2006
    • 7

    #2
    Re: Tach on '66 bouncing around

    I had the same problem on my 67. I did two things, I removed my gauge cluster and had it reconditioned by D&M Restoration. They told me the gauge had very little lubrication in it. I also removed the tach cable and relubed it. When I put everything back together the tach was as good as new - no boucing.

    Hope this helps.

    Peter

    Comment

    • Michael J.
      Extremely Frequent Poster
      • January 27, 2009
      • 7118

      #3
      Re: Tach on '66 bouncing around

      Originally posted by Peter Chase (45979)
      I had the same problem on my 67. I did two things, I removed my gauge cluster and had it reconditioned by D&M Restoration. They told me the gauge had very little lubrication in it. I also removed the tach cable and relubed it. When I put everything back together the tach was as good as new - no boucing.

      Hope this helps.

      Peter
      Thanks for this info. Starting with the easiest thing first, I will try lubing it. Any suggestions as to what lube to use?
      Big Tanks In the High Mountains of New Mexico

      Comment

      • Peter C.
        Infrequent User
        • June 30, 2006
        • 7

        #4
        Re: Tach on '66 bouncing around

        I used a product called Kable Ease from AGS. I believe I purchase it through Corvette Central. It was amazing to see how much easier the inside cable rotated once I did this. With luck this will solve your problem. Pulling the gauge cluster is no fun and I have to do it again this winter.

        Good luck.

        Peter

        Comment

        • Bill I.
          Very Frequent User
          • January 29, 2008
          • 554

          #5
          Re: Tach on '66 bouncing around

          Follow instruction on lubing, too much is BAD. Do Not lube the upper 1/3 of the cable, it will wick itself toward the tach fine. Bill.

          Comment

          • Clark K.
            Expired
            • January 12, 2009
            • 536

            #6
            Re: Tach on '66 bouncing around

            My '65 had minor "needle bounce" when I bought it a year ago. When I had the transmission rebuilt last summer, they found a worn out/defective "bullet" (?) that is on the end of the speedo cable. They replaced the cable since it was beyond lubrication. It immediately cured the needle bounce. -Clark

            Comment

            • Clark K.
              Expired
              • January 12, 2009
              • 536

              #7
              Re: Tach on '66 bouncing around

              Originally posted by Clark Kirby (49862)
              My '65 had minor "needle bounce" when I bought it a year ago. When I had the transmission rebuilt last summer, they found a worn out/defective "bullet" (?) that is on the end of the speedo cable. They replaced the cable since it was beyond lubrication. It immediately cured the needle bounce. -Clark
              Please disregard my post. I just realized that you have needle bounce on the tach, not the speedometer. Sorry. -Clark

              Comment

              • Chris E.
                Extremely Frequent Poster
                • November 3, 2006
                • 1326

                #8
                Re: Tach on '66 bouncing around

                Sorry to dig up an old thread, but I'm curious. Is the tach bounce in this video (around minute 3:30) normal?

                My car has a HUGE amount of bounce compared to this car. Just wondering which is right?

                (thinking ahead to my PV in September)

                Chris Enstrom
                North Central Chapter Judging Chairman
                1967 Rally Red convertible, 327/350, 4 speed, Duntov @ Hampton in 2013, Founders @ KC in 2014, family owned since 1973
                2011 Z06, red/red

                Comment

                • Ken A.
                  Very Frequent User
                  • July 31, 1986
                  • 929

                  #9
                  Re: Tach on '66 bouncing around

                  When you "goose" the motor you will see pointer bounce. The video car has normal bounce. At idle or steady RPM there should be no bounce. If the cable is suspect , ALWAYS replace the cable and casing as an assembly, not just the cable.

                  Comment

                  • Chris E.
                    Extremely Frequent Poster
                    • November 3, 2006
                    • 1326

                    #10
                    Re: Tach on '66 bouncing around

                    When I punch the throttle, mine does bounce around a bunch, more than the car in the video.

                    At steady RPM though, my tach does not bounce. I put a new cable in when the car was rebuilt.
                    Chris Enstrom
                    North Central Chapter Judging Chairman
                    1967 Rally Red convertible, 327/350, 4 speed, Duntov @ Hampton in 2013, Founders @ KC in 2014, family owned since 1973
                    2011 Z06, red/red

                    Comment

                    • Pat M.
                      Extremely Frequent Poster
                      • April 1, 2006
                      • 1575

                      #11
                      Re: Tach on '66 bouncing around

                      I'm pretty sure I had both tach and speedo bounce on my 70, and lubing the cables did not cure the problem. But new cables did, and they received no deducts in judging.

                      Comment

                      • Ronald L.
                        Extremely Frequent Poster
                        • October 18, 2009
                        • 3248

                        #12
                        Re: Tach on '66 bouncing around

                        What did you guys use to lube the tach mechanism within the cluster?

                        Comment

                        • Ken A.
                          Very Frequent User
                          • July 31, 1986
                          • 929

                          #13
                          Re: Tach on '66 bouncing around

                          Watch oil, ONLY!

                          Comment

                          • Ronald L.
                            Extremely Frequent Poster
                            • October 18, 2009
                            • 3248

                            #14
                            Re: Tach on '66 bouncing around

                            Ken Thanks. I have some of that for the grand father clock!

                            Comment

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