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Replacing Rear Seal Ugh

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Johns1967CJ5, Sep 21, 2018.

  1. Mar 26, 2019
    Rick Whitson

    Rick Whitson Detroit Area Sponsor 2019 Sponsor

    I live South of...
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    I did what Donny said, plus I took the timing cover off, so not to hurt the timing seal, slipped the seal right in, tightened up the mains, put it all back together and everything is fine, no more spotting under the bell housing.
     
  2. Mar 27, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

    Franklin, TN
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    When you say you offset them about 3/8 inch....can u explain that?
     
  3. Mar 28, 2019
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

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    You dont want the seam to line up with the bearing cap so I pushed it up 3/8 on 1 side and down the same on the other.
     
  4. Mar 28, 2019
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

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  5. Mar 28, 2019
    Keys5a

    Keys5a Sponsor Sponsor

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    With the seal splitting on the same seam as the main saddle, you invite leaks through the then coninuous seam. By offsetting the seal, you have a good chance of making the rear main oil tight.
    -Donny
     
  6. Mar 30, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

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    Thanks, makes sense
     
  7. Mar 30, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

    Franklin, TN
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    Pictures worth a thousand words!
     
  8. Mar 31, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

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    Got the rear bearing cap off with lots of wiggling. Had the old rope seal. Problem is it sheared off flush with the upper half of the bearing (yoke?) and I can’t get the top half to budge. Cotton fibers coming out one by one but no luck getting it to budge as a whole piece. I think I’m going to have to loosen the crank? Ideas?
     
  9. Mar 31, 2019
    Oldriginal86

    Oldriginal86 Member

    Pasadena, Md.
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    Grab it with needle nose pliers while someone else bars the engine over turning it in the same direction your pulling.
     
  10. Mar 31, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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  11. Mar 31, 2019
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

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    Spray some wd-40 up there, grab it if u can and turn the crank. Mine came right out. If you can't grab it try pushing with a stiff plastic something
     
  12. Apr 13, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

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    how long should the replacement dowels hang down form the bottom? I have them inserted as far as they will go and they are hanging down about 3/8 inch. I know they will get squished up when I put the oil pan back on but 3/8 seems a bit much? thanks, bh
     
  13. Apr 13, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    I squirted some Permatex up in each hole and inserted the dowel’s as far as they would go. I then cut mine off (as evenly/straight as possible) with about 1/4” of protrusion, that way they mushroomed out with the torquing of the pan to seal the holes. You’re close at 3/8” so I don’t know if I’d worry about it.
     
    Last edited: Apr 13, 2019
  14. Apr 13, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

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    ok....i'll snip them off tomorrow at 1/4 inch and go from there.
     
  15. Apr 13, 2019
    Greevesman

    Greevesman Sponsor Sponsor

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    Don't cut them off.
     
  16. May 2, 2019
    Bill67cj5

    Bill67cj5 Member Sponsor 2019 Sponsor

    Franklin, TN
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    Well I've replaced the seal once, still leaked. Took it to a shop that has done good work for me before and they replaced it, not once but 2x and there is still a leak streaming from the seam where engine meets transmission. I noticed the rear crankshaft bearing was a little worn or pitted when I had it off but not bad. Have I just had a series of bad seals (one from walks, one from Kaiser Willis one from the eBay link above ) or what? What else do I look for or what else could be leaking. It's not just a few drops...
    Thanks
     
  17. May 2, 2019
    Chilly

    Chilly Active Member 2019 Sponsor

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    Maybe not the rear main then? Are there plugged oil passages on back of your block? Maybe leaking from something other than a rear main. Possibly rear valve cover?
     
  18. May 2, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
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    The only things I can think of is the seal over the rear camshaft bearing & IIRC there's a plug at the end of the main oil gallery. I'd pull the engine & pump oil into it to see where it comes out.
     
  19. May 2, 2019
    Chilly

    Chilly Active Member 2019 Sponsor

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    There are dyes one can add to engine oil that will glow under black light. May dimly glow under some fluorescent lights, too. If you are gonna pull the engine for a look-see then maybe run with some dye before pulling. Should be easy to trace the trail of dye. And may be able to spin oil pump with a drill with engine pulled for live-action leaking
     
  20. May 2, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

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    Not on a F4 :( I made a pressure bottle out of some pvc pipe & pumped oil into the pressure sensor port.
     
    Chilly likes this.

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