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Thread: Lazy Tach

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  1. #1
    Yoda PAUL161's Avatar
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    Lazy Tach

    Started the TF up yesterday to let everything warm up and circulate the oils and the tach started acting goofy. Holding the RPMs steady, the tach would rise slowly and sometimes would pass where it should stop and then slowly drop below the proper RPM point, slowly moving up and down, when I let the engine idle, the tach would sometimes drop to zero and adding a little RPMs it would slowly climb back up. The generator belt is not slipping, the tach reduction gear is working fine and the cable appears to be fine. It's not cold in the garage so any thoughts on this situation?

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    Great Pumpkin NutmegCT's Avatar
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    Re: Lazy Tach

    Paul - I had similar issues on my '53 TD.

    Turned out that the end of the cable entering the tach had dried grease on it. Dried great also on the internals of the tach.

    I removed the tach, opened up and cleaned it, reinstalled. All has been well since.

    Tom M.
    Mac & Phyllis Take a Trip: http://nutmegflyer.com/trip-details-daily-updates/
    History: 1976 MGB, 1959 Triumph TR3A, 1960 Mercedes-Benz 190b, 1958 Rambler American.
    Current: 1953 MG TD27318.

  3. #3
    Yoda PAUL161's Avatar
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    Re: Lazy Tach

    Thanks Tom, did you lubricate the needles shaft? PJ

    Remember, Never Forget
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    How good it feels, the hand of an old friend! Longfellow

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    Yoda PAUL161's Avatar
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    Re: Lazy Tach

    Problem solved! I put in a new tach drive cable when I restored the car, but I bought the cheaper cable with the blue cover on it and it went bad. The cheaper cable has a plastic sleeve on the end and it split and slid toward the end putting pressure on the tach drive, picture enclosed.Arrow shows where it is supposed to be. I replaced it with one that is as original with no plastic anywhere. A bit more expensive to say the least, but no chance of it fouling the tach drive where the cable hooks up. The original type cable is held in place with "C" clips on each end of the cable and can not move in or out of position. I did pull the tach apart and cleaned it internally and lubed it also. Works very well! PJ
    Bad Tach Cable.jpg

    Remember, Never Forget
    We Live In The Land of The Free
    Because of The Brave

    How good it feels, the hand of an old friend! Longfellow

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