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Dana 18 Output Shaft Oil Seal

Discussion in 'Early CJ5 and CJ6 Tech' started by red61cj5, Oct 17, 2019.

  1. Oct 17, 2019
    red61cj5

    red61cj5 Just fell off the turnip truck!

    wv
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    May 16, 2011
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    Specifically removing the old seal. The rear in particular, since that is where the worst leak is, though I will most likely do both. Can it be removed and replaced with just the yoke out, or does the shaft housing need to be removed? Any tips or tricks appreciated. Ive watched several rebuild videos but they sort of gloss over this. Thanks in advance
     
  2. Oct 17, 2019
    Twin2

    Twin2 wasn't me Sponsor 2019 Sponsor

    Virginia Beach, VA
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    yep it can be replaced with yoke and drum removed
    going to need a seal puller
    and installing tool
    seal puller.JPG
    don't forget to use RTV silicone on splines when it goes back together
     
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  3. Oct 17, 2019
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    I have used screwdrivers, small cold chisels and drywall screws with vise grips to pull them out. I think you can also double the seals. Look at your yoke, is it pitted or have a groove cut into it from the seal? I bought a new one when I did mine.
     
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  4. Oct 17, 2019
    red61cj5

    red61cj5 Just fell off the turnip truck!

    wv
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    I'm gonna krokus cloth the yoke shaft and see if it smooths out, if not ill either speedi sleeve or replace, Ive got a few junk 18's around here, might have a good one in one of those, Also, when I took the yoke off, the 1 1/8 nut holding it on came off with one hand on the wrench. Probably not the 175 lb ft that its supposed to be. Maybe that was the cause of my leaking? or at least contributing? When you double seals do they both go in the same way?
     
  5. Oct 17, 2019
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    I doubled the seals on mine - I think I use the Federal mogul ones from NAPA if I remember correctly as they are a bit thinner. I put them on both in the same direction - same direction as if I had only used one. If any oil get by the inner one, it would still have to get by the second one. Seems to work quite well...and it really helps the parking brake if it isn't oil saturated all the time.
     
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  6. Oct 17, 2019
    modadds

    modadds New Member

    Sweetwater, Texas
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    Feb 25, 2014
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    Put sealant on the spines of the yolk as well. I just finished my D-18 / T-90 rebuild. Just pried my seals out . Once while in the jeep and once when everything was out on the bench, Use sealant under speedi sleave or it will leak there also. Good luck!!!
     
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  7. Oct 17, 2019
    red61cj5

    red61cj5 Just fell off the turnip truck!

    wv
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    You can seal under a sleeve? And it'll still go on? I thought the clearances were too tight for that. Also, and don't laugh, but the seals go in with the rubber side facing out towards the yoke, right? That's how its in there now.
     
  8. Oct 17, 2019
    nickmil

    nickmil In mothballs. Sponsor

    Happy Valley, OR
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    Use threadlocker on installation of the sleeve I use red Loc-Tite brand. It acts as a sealer, as a lubricant on installation, and locks the sleeve on the yoke once it sets up. The lip of the seal should face inward toward the transfer case to keep the lube in.
     
  9. Oct 17, 2019
    Norcal69

    Norcal69 Out of the box thinker 2019 Sponsor

    Cottonwood, Ca
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    I think that if you change the yoke it would probably be a good idea to check the end play.... others may know.
    On both of my transfer cases I threw the felt seal away and doubled up the seals with double lip seals. No leaks!
     
  10. Oct 17, 2019
    TIm E

    TIm E Member Sponsor 2019 Sponsor

    NW Arkansas
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    If you do double seals, I would suggest packing some grease between them. Seals actually rely on the oil to lubricate them. The outer seal gets no oil and the rubber is likely to burn up on the dry shaft fairly quickly and not do much for you when the inner seal eventually fails.
     
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  11. Oct 18, 2019
    Norcal69

    Norcal69 Out of the box thinker 2019 Sponsor

    Cottonwood, Ca
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    This is a good idea! I forgot to add.... after a few weeks I got a weird squeak.... turns out it was coming from the outer seal on the rear output shaft. I made a very small hole in the steel portion of the seal just large enough to get a spray can straw into. I squirted some tri flow in there back in March. several thousand miles ago..... The hole was made with an awl lightly tapped with a hammer on the upper side of the seal. Once a year squirt kinda thing.....

    Edit to add info.
     
    Last edited: Oct 18, 2019
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  12. Oct 18, 2019
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    I was always told to grease the seals before assembling wheel bearings, pinion seals, and whatever. This is a great idea to pack the void with grease.
     
  13. Oct 18, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

    Gulf Breeze FL...
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    I learned that if there is a spring that holds tension around the seal that the spring faces the oil.
     
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  14. Oct 18, 2019
    BadGoat

    BadGoat How High Can You Climb?

    St Croix, USVI
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    It's actually cheaper to replace the yoke with a new one then to buy a Speedy Sleeve for it. I can see sleeveing one for a full restoration, but I replaced mine as it was nicely grooved to aid in oil dispersion.

    Mike
     
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  15. Oct 18, 2019
    Norcal69

    Norcal69 Out of the box thinker 2019 Sponsor

    Cottonwood, Ca
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    This is the manner that I installed mine. Spring inside, spring inside.....
     
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