1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Which Is The Correct Or Better Rear Seal For The Dana 18 Transfer Case?

Discussion in 'Early CJ5 and CJ6 Tech' started by maurywhurt, Nov 14, 2019.

  1. Nov 14, 2019
    maurywhurt

    maurywhurt Member Sponsor 2019 Sponsor

    Western North...
    Joined:
    Dec 12, 2009
    Messages:
    516
    These are both from Crown's online catalog - one's a closed seal, and the other is an open seal:


    Output Seal

    [​IMG]

    Replaces Part #: J0923896
    Price: (Log in to see price)
    • This is a closed seal. For an open seal, use J8123077.


    Output Seal

    [​IMG]

    Replaces Part #: J8123077
    Price: (Log in to see price)
    • This is an open seal. For a closed seal, use J0923896.
    Also, is there a National / Federal Mogul rear seal available for the D-18?
     
    Last edited: Nov 14, 2019
  2. Nov 14, 2019
    CJ Joe

    CJ Joe Truckhaven Tough!

    Pinon Hills, CA
    Joined:
    Nov 9, 2002
    Messages:
    344
    My notes indicate the Timken National 473229 applies to both input & output. This is a double lipped seal. Spec'd for 1.5625" shaft.
    I can't find any dimensional specs for the Crown seal (other than the dimensions of the box it comes in! LOL).
     
  3. Nov 14, 2019
    48cj2a

    48cj2a http://bantamt3c.com Sponsor

    Central Illinois
    Joined:
    May 4, 2003
    Messages:
    431
    Mcruff likes this.
  4. Nov 14, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    5,881
    I stuck two of the double lipped F-M seals in there, not dripping.

    [​IMG]
     
    Last edited: Nov 14, 2019
    Tom_Hartz and FinoCJ like this.
  5. Nov 14, 2019
    Twin2

    Twin2 wasn't me Sponsor 2019 Sponsor

    Virginia Beach, VA
    Joined:
    Apr 28, 2011
    Messages:
    3,868
  6. Nov 14, 2019
    maurywhurt

    maurywhurt Member Sponsor 2019 Sponsor

    Western North...
    Joined:
    Dec 12, 2009
    Messages:
    516
    Thanks very much for all the help, guys. It sounds like either type of seal (open or closed) will work. I agree that a major brand name like Federal Mogul / National would be preferable to Crown, and will buy accordingly.

    I've read on other threads that installing two seals back to back has worked well for some. I think this is also what Howard referred to above. Any other thoughts on that idea?
     
    Last edited: Nov 14, 2019
  7. Nov 14, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    3,457
    Just make sure you lubricate them. Otherwise the outside one will be running dry until the inside one leaks, and by that time the outside one will have been destroyed from friction.
     
    Tom_Hartz likes this.
  8. Nov 14, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    5,881
    FWIW I packed bearing grease between mine.
     
    OldAdobe and ITLKSEZ like this.
  9. Nov 14, 2019
    48cj2a

    48cj2a http://bantamt3c.com Sponsor

    Central Illinois
    Joined:
    May 4, 2003
    Messages:
    431
    I've also read where guys put a good quality black sealant on the splines to prevent weeping there as well, but make sure its clean and oil free.
     
  10. Nov 14, 2019
    Mcruff

    Mcruff Earlycj5 Machinist Sponsor

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    4,904
    A good trick to lube seals this way is to put a piece of wool wicking material (buy from McMaster Carr) cut to fit inside the hollow body. Before you put it in, soak it in motor oil. It is then lubed for life. The wicking material is what the factory used to put inside your pilot bushing hole to oil the pilot bearing.
     
    FinoCJ and 47v6 like this.
  11. Nov 14, 2019
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
    Joined:
    Oct 25, 2006
    Messages:
    4,629
    Great info.
     
  12. Nov 14, 2019
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
    Joined:
    Jul 18, 2013
    Messages:
    2,428
    I did it like Howard said...used the FM seal that I think was just a smidge thinnier and it makes it easy to double up the install...I used a bit of grease inside the cavity for lube, but I like McRuff's idea a lot....
     
  13. Nov 15, 2019
    maurywhurt

    maurywhurt Member Sponsor 2019 Sponsor

    Western North...
    Joined:
    Dec 12, 2009
    Messages:
    516
    That sounds like a great idea, Mike - thanks!

    Is this the wool wicking you use (the cord shape), or something different?: McMaster-Carr
     
    Last edited: Nov 15, 2019
  14. Nov 15, 2019
    Mcruff

    Mcruff Earlycj5 Machinist Sponsor

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    4,904
    I have not used much of the cord, I have several of the sheets I keep around and I cut them from sheets. My old 70 year old lathe uses this stuff from the factory.
     
  15. Nov 17, 2019
    givemethewillys

    givemethewillys Sponsor Sponsor

    New Kent, VA
    Joined:
    Jun 21, 2005
    Messages:
    868
    So if I'm understanding this thread correctly, are people recommending NOT using the seal that comes in the "gasket and seal" kits out there (from omix, crown, and others)? My dana 18 is ready to go back together, and i need to figure out if i need to order 2 more seals!
     
  16. Nov 18, 2019
    maurywhurt

    maurywhurt Member Sponsor 2019 Sponsor

    Western North...
    Joined:
    Dec 12, 2009
    Messages:
    516
    Here are both of the National seals referenced above:

    [​IMG]

    The closed 450185 is about 0.5" thick, and the open 473229 is about 0.31" thick.

    I think I'm going to use two of the open 473229's, as using the thinner model seems to be the best option for doubling up the output shaft seals.

    I plan to get some of the wool wicking Mcruff suggested from McMaster Carr (probably the 1/4" cord), and as he suggested, soak it in engine oil and stuff it in the openings prior to installation.

    Any more thoughts or wisdom on this idea are certainly welcome!
     
    Last edited: Nov 18, 2019
    Twin2 likes this.

Share This Page

New Posts