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Thread: Engine revs up slightly with clutch down?

  1. #1
    Join Date
    Jul 2009

    Default Engine revs up slightly with clutch down?

    Before I dig into this, I thought I would throw this out to the forum. When driving my Scout and I come to a light (pressing in clutch), the engine picks up 700 rpm to 1300. I let the clutch out in neutral and the engine drops down to 600 rpm.

  2. #2
    Join Date
    Jun 2009
    Hurlburt Field, FL


    What kind of engine and carb are you running? If it has an electric choke, that might be the "culprit" although it's not necessarily a bad thing. It's the carb sensing the engine slow down from a 'load' on it (pushing the clutch against the clutch plate) and it speeds the engine up a little. When you let out on the clutch, the 'load' isn't there anymore so it slows the idle back down.

  3. #3
    Join Date
    Feb 2009
    Aiken, SC


    I'd guess the clutch linkage is tangled up with the throttle cable somehow. You'll need to have somebody push in the clutch while you look at the throttle linkage. If you have that much drag from the transmission, there is a major problem, like the gear oil hasn't been changed in 30 years.

    By the way, straight 50 wt or even 20w50 works great in a manual transmission from a scout, much better than the original 90 wt gear oil. Same is true in the Dana 20 t-case.
    Allan E.
    Curmudgeon Extraordinaire
    Charter Member, Old Hippie IH Club
    Old fashioned binder freak


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