tranny leak ( odd gasket)

Discussion in 'Classic Buicks' started by Amyhasa62, Jun 5, 2021.

  1. Amyhasa62

    Amyhasa62 Active Member

    I recently had my tranny pan gasket chg for several reasons, previous owner had put silicone around the pan to stop leak even though they gave me the gasket they never chged it , and after reading maintenence notes from another owner he was always putting fluid in every spring after storage.
    I never had a leak, there might be a drop or two but nothing bad. since replacing the gasket which it needed because the old one was broken. I now have what I call a major leak see photos take 2 that were days apart.. do you guys have any ideas as to why this might be happening, any tricks or fixes to get it to stop. im checking fluid so much because I dont want me tranny to burn up but fluids seem fine, the mechanic ( old car guy) said it might be because he over filled it..

    one other thing does anyone have an extra tranny mount for a 62 skylark dual path?

    thanks for your help 20210601_212232.jpg 20210604_101001.jpg
     
  2. BYoung

    BYoung Stage me

    I doubt that leak is from over filling. Someone needs to get underneath, wipe it clean, and find the source. It's most likely a poor seal of the pan gasket since that is what was recently serviced. Need to know what the pan gasket material is.

    Do not allow anyone to overtighten the pan screws. It could warp the pan and you'll end up needing a new one.
     
  3. Amyhasa62

    Amyhasa62 Active Member

    its the rubber gasket that fits into a groove in the pan. reminds me of a very large pony tail holder. if u ever saw athletic girls who wear a type of rubber band headband? its about as wide as that maybe a 1/4" i ordered 2 more from old buick to have on hand

    its definitely not a flat cork type that lays flat. totally not that type of pan

    I asked him if he thought maybe the pan was bent to begin with he said no the pan is perfect.. my car is all original was never driven just turned 40,000. im probably the 1st to have the fluid chgd
     
  4. JESUPERCAT

    JESUPERCAT No Slow Boat

    The pan may have to come off again to check the gasket surface. It can be straightened if it is warped near the bolt holes from being overtightened. Use a clean drain pan if you find you need to drop the pan so you can reuse the fluid. Also check the case just above the pan for leaks, fill tube, speedometer sending unit, governor. Let us know what you find.
     
  5. Quick Buick

    Quick Buick Arlington Wa

  6. sean Buick 76

    sean Buick 76 Buick Nut

    I would question two things:

    Is the pan warped?
    Were the bolts torqued in the correct sequence?
     
  7. gstewart

    gstewart Well-Known Member

    U might be wise to buy a quality aftermarket pan. Your pan may be warped and/or the bolt holes have been overtightened & pressed inward.
     
  8. Max Damage

    Max Damage I'm working on it!

    To me, the "I might have over filled it" thing is not a good sign. It seems clear the leaking is very likely related to the recent service.

    I guess this is the "Dualpath" transmission? some of these only have a SINGLE bolt in the middle of the pan, so if it's been over tightened, or the pan is warped or damaged, it could be an issue to get it to seal... Some of them have multiple bolts around the perimeter as is more normal. It would be good to know which you have?
     
    Last edited: Jun 6, 2021
  9. Amyhasa62

    Amyhasa62 Active Member

    one bolt through the center. I asked my mechanic if the pan is warped or in anyway an issue.. he said the pan is straight.. hes been a professional mechanic since the later 50s, has many all original stock classic cars. I trust his word.. he believes it has something to do with that funky gasket, that needed 5 hands to get it to stay in the Grove thats in the pan. its not the typical cork gasket that seals flat against the pan.. the 62 is the oddest car unfortunately
     
  10. Matt Knutson

    Matt Knutson Well-Known Member

    I'm guessing the design flaw of one bolt assembly is the cause of your leak. I'd pull the pan down and inspect the pan and the metal around the bolt hole for stretching. Maybe it wasn't tight enough. Do you know the torque spec? Maybe the seal isn't fat enough and ran out of clamping force. This place says they have "the best gasket" for that application - perhaps there are incorrect and cheap knockoffs.

    https://vintagegasket.com/shop/1962-63-dual-path-oil-pan-gasket-9106e/
     
  11. Amyhasa62

    Amyhasa62 Active Member

    the gasket i used the seller gave it to me. I ordered 2 from old buick looks the same
     
  12. Max Damage

    Max Damage I'm working on it!

    Ok, well if you are confident that your mechanic knows what he's doing, he should be able to fix it. I would think you want to stick the gasket to the pan first in the right position so that it stays put? I have never done on of these, so I am speculating...

    Modern sealants and gasket makers might also be superior to trying to get that "hair tie" to stay put...
     
    2dtrak and Matt Knutson like this.
  13. Matt Knutson

    Matt Knutson Well-Known Member

    Is there any up-date regarding the leak?
     
  14. Amyhasa62

    Amyhasa62 Active Member

    not really. I keep checking fluid and its still full.
     
  15. Matt Knutson

    Matt Knutson Well-Known Member

    That's a good thing. It sounds like the problem is resolved. Just keep an eye on it.
     
  16. Mark Demko

    Mark Demko Well-Known Member

    Put some leak tracer dye in it.
    It might be coming from a shift shaft seal, speedo housing O-ring, governor cover O-ring.
    Without the dye and checking with a black light theres no way to tell for sure.
     

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