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Clutch Pilot Bushing

Discussion in 'Early CJ5 and CJ6 Tech' started by modadds, Oct 16, 2019.

  1. Oct 16, 2019
    modadds

    modadds New Member

    Sweetwater, Texas
    Joined:
    Feb 25, 2014
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    44
    What is the proper clearance of the pilot bushing in the center of the flywheel, between it and the end of the pilot shaft of the transmission? Mine has swelled a little after installing it in the flywheel. I figure a few thousands would be enough for the pilot shaft to not wobble , but spin freely.
     
  2. Oct 17, 2019
    Rick Whitson

    Rick Whitson Detroit Area 2024 Sponsor 2022 Sponsor

    I live South of...
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    Welcome from Michigan, I wondered the same thing, someone here will know, I put mine together anyway and everything is good so far, that was 6k miles ago. Good Luck
     
  3. Oct 17, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Think about it like this. The only time there is a chance of wobble between pilot bushing and input shaft is when the engine is running and the clutch is pushed in. All the rest of the time the shaft is spinning with the engine. If the pilot hole is too big then the clutch disk will not center properly and can cause a vibration.
     
  4. Oct 17, 2019
    modadds

    modadds New Member

    Sweetwater, Texas
    Joined:
    Feb 25, 2014
    Messages:
    44
    Measured the end of my Pilot shaft and it was right at 5/8". Cleaned bushing with a 5/8" reamer and test fitted flywheel and no slop and fit perfectly. Thanks for the responses!
     
  5. Oct 17, 2019
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    Oct 10, 2015
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    1,900
    Just for learning, does the input shaft move in and out (I don't think so) as you depress the clutch, or does the shaft just catch up to the speed of the crankshaft thus spinning same speed as pilot bushing, less any possible slippage?
     
  6. Oct 17, 2019
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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  7. Oct 17, 2019
    duffer

    duffer Rodent Power

    Bozeman, MT
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    A loose fit pilot bearing creates way more problems than just vibration. The potential misalignment of transmission input shaft will prematurely wear the needle bearings out in the mainshaft pilot. Sort of the same plot as a misaligned bellhousing. Obviously if the fit is too tight, the clutch will not disengage.
     
    Walt Couch likes this.
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