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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 Member Sponsor 2019 Sponsor

    NW Arkansas
    Joined:
    Mar 2, 2017
    Messages:
    638
    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 Sponsor

    Denver, CO
    Joined:
    Jul 18, 2013
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    2,433
    remember that when it stops leaking, its out of oil.
     
  4. Mar 1, 2019
    Skipjack

    Skipjack 1952 M38A1

    Tucson
    Joined:
    Feb 26, 2019
    Messages:
    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! Sponsor

    Washington DC.
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    Oct 25, 2006
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    4,629
    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
    Messages:
    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 Sponsor Sponsor

    Joined:
    Jul 11, 2012
    Messages:
    685
    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 New Member

    Northern Wisconsin
    Joined:
    Aug 13, 2016
    Messages:
    35
    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
    Messages:
    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 Member Sponsor

    Gulf Breeze FL...
    Joined:
    Jun 5, 2007
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    1,041
    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
    Joined:
    Feb 26, 2019
    Messages:
    20
    Cool tool!!! I might have to make one!
     
  12. Mar 10, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    6,497
    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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