Tach cable firewall grommet removal on '67 - NCRS Discussion Boards

Tach cable firewall grommet removal on '67

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  • Alexander D.
    Very Frequent User
    • July 9, 2015
    • 111
    #1

    Tach cable firewall grommet removal on '67

    Hi guys,

    I'm wanting to replace the tach cable assembly (casing and cable inside) on my '67. My car is base engine, factory A/C, and Powerglide.


    The tach cable runs from the distributor, through a rubber grommet on the firewall (under the wiper motor, to the cluster.


    I tried prying on the rubber grommet from the engine side with a flat bladed screwdriver. But, the thing is darned stubborn! I feared wrecking the grommet if I continued to fight with it. I then got under the dash, and can (barely) see the grommet. It looks like the inside flange of the grommet is smaller than the outside flange, but access here is very difficult.

    The grommet must be reasonably new, as it remains pliable and resisted the abuse I gave it without cracking or splitting.


    Should I try pushing the grommet out from inside the car? Any tips on how to remove the grommet so I don't destroy it in the process? Anything else I should beware of when replacing the tach cable casing assembly?

    Thanks for your suggestions/advice.

    Alex
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    • Tom E.
      Very Frequent User
      • June 1, 2019
      • 448
      #2
      Re: Tach cable firewall grommet removal on '67

      Alex,
      I would push it out from the inside as it is designed to be inserted from the firewall side. See attached image showing rubber flanges. If you do happen to tear it they are only a few dollars at all of the vendors. You will need to make a slit in the side if reinstalling new one.
      Tom

      6F5290FA-A2DC-47D5-A581-34A671E333C2.jpg
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        • Alexander D.
          Very Frequent User
          • July 9, 2015
          • 111
          #3
          Re: Tach cable firewall grommet removal on '67

          Hi Tom,

          The grommet you pictured is exactly the same one used in my car. After mulling on how to remove it and giving up the first time, I was finally able to remove it last night by prying on it from the firewall side. There just wasn't sufficient room to get at it from under the cramped dash to push it out from the inside. Anyhow, with a little effort and persistence, I got it out without tearing it.

          I replaced my tach cable and re-used the grommet. I'm pleased to report my rev counter is working again for the first time in YEARS!
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