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Purging Trans Fluid

Discussion in 'Early CJ5 and CJ6 Tech' started by MP67CJ5, Nov 15, 2020.

  1. Nov 15, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
    Joined:
    Aug 20, 2019
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    30
    Finally drained the trans fluid from the old T86 in my rig and it came out like sludge. Do I need to purge the old fluid/sludge until I’m sure it’s all completely out or can I let it slowly drain for a while and that will be sufficient? If I do need to purge it all out, any suggestions on how to do that?

    MP
     
  2. Nov 15, 2020
    SFaulken

    SFaulken Active Member

    Bellevue, WA
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    May 24, 2011
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    I'd just mix some kerosene or diesel fuel into it, and let it break down the sludge, and then drain it down again. But that's just me.
     
  3. Nov 15, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
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    Thanks for the quick response, SFaulken. Makes me a little nervous to put kerosene into the trans. Is it not an issue if some of it is left in the trans and doesn’t get completely drained out?
     
  4. Nov 15, 2020
    SFaulken

    SFaulken Active Member

    Bellevue, WA
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    Nope. Not in my experience. Heck, lots of guys run a transmission on pure Diesel/kerosene for a little bit to clean everything out when changing fluids. Just fill it with Diesel/Kerosene, and take it for a couple really "easy" cruises around the block, to get it good and churned up, You wouldn't want to do it for very long, or do it with any sort of load on it, but a little idling around? Won't hurt a thing.
     
  5. Nov 15, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
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    Aug 20, 2019
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    Awesome, thanks! I’ll give it a shot. Hopefully this thing will shift a little less like a tractor with some fresh fluid in there.
     
  6. Nov 15, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    I would not run it with kerosene or whatever in the transmission. Residual solvent will contaminate the new oil. Be sure to use GL-4 oil, discussed many times in this forum.
     
  7. Nov 15, 2020
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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    Jun 19, 2009
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    3,083
    I use diesel after swamping my jeep. It works great.
     
    MP67CJ5 likes this.
  8. Nov 15, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
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    Aug 20, 2019
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    I have the GL-4 oil but I want to clean out all of the sludge before putting the fresh oil in. Is there a better way to do that other than diesel/kerosene? Or should I just fill it with the fresh oil?
     
  9. Nov 15, 2020
    Tom in RI

    Tom in RI Member

    Rhode Island
    Joined:
    Aug 1, 2008
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    234
    I have used light engine oil to flush. 0w-20 or straight 10w(if you can find it) will clear out some goobers. I didnt drive with it - just put the TC in neutral and go through the gears.
     
  10. Nov 15, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
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    Thanks for the feedback, guys!
     
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