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M38a1 Leaking Gear Oil

Discussion in 'Jeep Truck and FC Tech' started by Skipjack, Mar 1, 2019.

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  1. Mar 1, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
    Joined:
    Feb 26, 2019
    Messages:
    20
    My A1 is pissing gear oil out near the rear drive shaft. I topped it off a few days ago (first time I touched it at all) & it runs out overnight.
     
  2. Mar 1, 2019
    TIm E

    TIm E Aggressively average

    NW Arkansas
    Joined:
    Mar 2, 2017
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    683
    At the differential/axle end of the driveshaft or up at the transfer case?

    Either way, likely a bad/worn yoke seal. Be sure if you replace the seal to inspect the seal surface on the yoke. If galled up, you may need to replace the yoke too.
     
    Skipjack likes this.
  3. Mar 1, 2019
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Jul 18, 2013
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    5,593
    remember that when it stops leaking, its out of oil.
     
  4. Mar 1, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
    Joined:
    Feb 26, 2019
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    20
    Yup. I’m gonna have to put a pan under her. I already have a leaking rear main seal that I have been living with. Maybe time to take the tub off again. ☹️. Busy project pictures to follow! Thank you for your insights!!!!
     
  5. Mar 1, 2019
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    USA
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    Just pour it back in!:rofl:

    Fix the seal and maybe buy a new yoke where the seal ate into it, or you might get lucky and not have that issue, or drive the new seal in a bit further to miss the groove?
     
  6. Mar 9, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
    Joined:
    Feb 26, 2019
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    20
    I bought 2 yoke seals & 2 felts from Kaiser willys. Should come any day. Looks pretty simple to pry it out & drive a new one in. (After cleaning)
     
  7. Mar 9, 2019
    montanacj

    montanacj Member

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    Jul 11, 2012
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    794
    It’s just a Jeep thing, if it’s not leaking that means there is no fluid left. :D
     
  8. Mar 10, 2019
    Siskiwit

    Siskiwit Member

    Northern Wisconsin
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    Aug 13, 2016
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    67
    That seal is a bugger to get out. Had mine on a bench and still butchered it badly.
     
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  9. Mar 10, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
    Joined:
    Feb 26, 2019
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    20
    I’m going to try to get it out with my m38a1 on ramps. Hope it comes out easier than that. Seals come on Monday. Might pull it tonight. I will post some pics.
     
  10. Mar 10, 2019
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    I don’t think it matters. I made this seal puller.

    [​IMG]
     
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  11. Mar 10, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
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    Feb 26, 2019
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    20
    Cool tool!!! I might have to make one!
     
  12. Mar 10, 2019
    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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    Make sure to put sealant on the splines.
     
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  13. Mar 11, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
    Joined:
    Feb 26, 2019
    Messages:
    20
    Pulled the back of the transfer case yoke. Scrubbed off the grime with soap & water then drove out the old yoke seal with a 32mm socket. I didn’t see an old felt. Just a seal.
     

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    Buildflycrash likes this.
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