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Reaming a pilot bushing

Discussion in 'Early CJ5 and CJ6 Tech' started by Project71-5, Feb 27, 2013.

  1. Feb 27, 2013
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    Whats the best way to ream out a pilot bushing .002" or so?

    I installed a new pilot bushing into the crank, which I believe is .590" ID. Today the new input shaft for my SM465 arrived since the old shaft had noticeable wear on the tip. The new shaft measures .590" at the tip. It is a tight fit in the pilot bushing and I can already see it giving me fits when installing the transmission. The clutch alignment tool I have is .583 and it fits the installed bushing fine so it doesn't need much removed. Whats the best method without buying a reamer?
     
  2. Feb 27, 2013
    tarry99

    tarry99 Member

    Northern California
    Joined:
    Oct 29, 2012
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    3,784
    :)I would pull the Pilot Bushing out and chuck it up in a lathe and take an inside boring bar on the tool post and take your .002/.003 off..........you can also check the fit while still in the lathe.........tring to clean that up on the motor would be a challange to keep the hole straight and in line with the crankshaft. Not saying it could not be done but since your calling out numbers in thousands I assume you want it done correctly.:D
     
  3. Feb 27, 2013
    chuck123wapati

    chuck123wapati Member

    wyoming
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    Jun 18, 2008
    Messages:
    761
    did you try it on your new shaft before installing it? some folks use a barrel sander or like me drill bit the right size. 19/32 = .59375 i did mine installed with a 1/2 drill hasnt given me any problems I dont think it has to be lathe perfect to work.
     
    Last edited: Feb 27, 2013
  4. Feb 27, 2013
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    Tried the bushing on the old shaft and it fit fine. I just measured the old shaft at .587 and it fits the installed bushing. I can't measure the installed bushing because my caliper tips aren't long enough.

    The new shaft will go into the bushing but it has to be aligned perfect and even then it takes a bit of twisting. I'll definitely be cussing trying to do it with a 175 lb. transmission on the other end :D
     
  5. Feb 27, 2013
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Aug 3, 2003
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    Dremel tool with sanding drum?
     
  6. Mar 1, 2013
    Roundfender

    Roundfender New Member

    Hungary
    Joined:
    Jan 22, 2013
    Messages:
    18
    Hi Guys,
    I am a new member, with the help of Bill, (thanks again) after a long struggle. Could not join on my own, but I am a member at last. Have a M38A1 and working on CJ's and MB's etc. Zoli

    About reaming and sanding the bushing: Be careful not to clog the pores of the oil soaked sintered bronze.
     
  7. Mar 1, 2013
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
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    4,461
    I would be very reluctant to use any sort of abrasive to open up the bushing as it will be impossible to clean all the grit out and it will then eat up the new input. With an adjustable reamer, it could be done with a drill press or maybe even a 1/2" drill, but a lathe is the real tool for the job-reamer or boring bar. I certainly would not want to run it tight as it will generate a lot of heat and cook the lube out.
     
  8. Mar 1, 2013
    kamel

    kamel Senior Curmudgeon

    Erlanger, Kentucky
    Joined:
    Jun 10, 2003
    Messages:
    891
    Dittos on the adjustable reamer. Go ahead and buy a set -- you'll be surprised at how often you will end up using them.
     
  9. Mar 1, 2013
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    5,466
    I have also seen a hone used to open a pilot bearing a touch.
     
  10. Mar 4, 2013
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    I picked up a new bushing yesterday from Autozone. Its an in-stock item and was less than $5.00. The new bushing measures .592 I.D.

    I'm going to grab a bore gauge from work tomorrow and measure the I.D. of the installed bushing to see how much the bore shrinks when pressed in. After that I'll open up the new bushing on the lathe so that it will end up around .593 when installed. This will give me .003 of clearance which should be enough :)
     
  11. Mar 4, 2013
    tarry99

    tarry99 Member

    Northern California
    Joined:
    Oct 29, 2012
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    :)That is the best method to fix that situation............also if it does not already have a tapered radius on the input ID give it some help on the lathe so that input shaft finds its way home a little easier.
     
  12. Mar 5, 2013
    kamel

    kamel Senior Curmudgeon

    Erlanger, Kentucky
    Joined:
    Jun 10, 2003
    Messages:
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    These bushings are supposed to be porous. Once you have it to the size you want you oughta soak it in some oil for a day or so before installing, or after installing come up with a way to immerse it in oil for a day.
     
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