Replacing rear main seal question

Discussion in '40- & 55-Series Tech' started by youngdogs, Jul 26, 2005.

  1. youngdogs

    youngdogs

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    I needed to replace my throw-out bearing, so I thought while I had the pig apart, I'd resurface the flywheel, install a new clutch, etc. I also purchased a new rear main seal since I'm into it this deep already.

    So my question is - is there any trick to getting the old seal out & installing the new one? I've loosened the two bolts that are on the outsides of the seal, but the seal doesn't seem any looser. Do I need to also loosen the oil pan bolts at the rear on the engine? I don't want to rip the seal out (which isn't leaking, but I'm doing this as preventive maintenance), only to not be able to get the new one in!
     
  2. zebrabeefj40

    zebrabeefj40

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    No need to loosen bolts to pull the seal. Drive a screwdriver through the old seal or hook a dental pick behind it and yank/pry it out. Just be careful not to mark the seal surface with whatever tools you use.
     
  3. snailwagon

    snailwagon

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    Don't be afraind to destroy your old seal, but be carefully installing one. Naturally, for a such a fast moving part, the seal is very tight fitting. I don't like messing with loosenling bolts like that unless necessary. If too rushed, you can tear the outside of it(don't ask me how I found out). Toyota sells a SST for it, I just used a piece of wood and a rubber mallet, working very slowly in a circle a few times.
     
  4. elblat

    elblat

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    On one stubborn 2F, I had to drop the oil pan and loosen the four bearing cap bolts a hair to get a new seal it. It was always just too tight, and I kept tearing seals. But on several others, it just tapped right in (with patience).
     
  5. HawkDriver

    HawkDriver

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    Definitely only loosen main caps as a last resort, don't want to compromise that bearing surface, once those break in after a rebuild they should never be messed with until the next rebuild. It could easily lead to premature failure and that'll cost a lot more than a seal.

    My opinion.
     
  6. youngdogs

    youngdogs

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    Thanks guys! I appreciate the replies.

    Last night when I got home from work, I pulled the old one out ... and messed the new one up during the install. (It was dark outside, and when I finished putting it in, it looked like there was a small spot of greese on one edge. When I attempted to wipe it off, I found out it was 1/4 inch long x 1/8 inch portion of the rubber outter lip.) That's what I get for trying to hurry! So this morning I ordered a new one from SOR. Hopefully it will arrive on Saturday.
     
  7. honk

    honk

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    That may not be significant. The seals often have a little excess rubber over the outer housing that gets shaved during the install. It's the inner part that does the sealing.
     
  8. HawkDriver

    HawkDriver

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    On the install of your next one,

    It just takes one little tap at a time, get it set in by hand as far and tight as you can and make sure it's going in square before you ever use the mallet. After that just a tiny tap one side then opposite a few times then round and round, small taps is the key. You prolly figured that out already, just trying to help save you another 40 bucks or so. :beer: Good luck man.
     
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