Gearbox oil leaks
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  1. #1
    I'm a grown up member now ! 69bird400's Avatar
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    Gearbox oil leaks

    Hi all,

    I know oil leaks are part and parcel of the qwirks of an old car but they really bug me, I can't cure the trans fluid leaks on either of my cars, one is a TH400 box on the pontiac and the other is a GM180? on the deuce, the bird is fully rebuilt with all new seals etc, rubber pan gasket, i even drilled and fitted a sump drain ready for taking it off again, but i've tried many sealants and can't stop it leaking, obviously doing up too tight or too lose is a possible cause i know

    Anyone got any magic answers or good experience with a product?

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    I'm a grown up member now ! americanautomatics's Avatar
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    Leaky pans can be a pain and trans fluid is so thin it seems to find its way everywhere!

    With my rebuilds I carefully panel beat all the bolt hole areas back to dead flat by sticking a flat piece of bar stock steel in a vice. I dont use sealant. I use the cork gaskets without issues. I torque them with a low lbs/ft torque wrench to the correct factory setting. This is usually in region of 8 - 12lbs ft. Start low about 6lbs and just keep going round and round the pan unitl they eventually do make the wrench click, then up the anty to the right setting. This should work fine but only if your pan face is flat already. I also recommend the faces are bone dry so the gasket stays put. If its oily it tends to want to squeeze out before its squeezed up.
    Jon

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    Stroker Kustom Jim's Avatar
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    I was under the 350/th350 tother day and all the sump bolts were finger loose with oil weeping (and rocker covers). Nipped em all back up lightly again. Seems like the lightly torqued bolts are prone to it?
    "I'm not going to take this defeatist attitude and listen to all this crap any more from all these people who have nothing except doomsday to predict."
    Carroll Shelby

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  6. #4
    I'm a grown up member now ! 69bird400's Avatar
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    i spent ages making sure it was straight and true, clean and dry before putting on and used the rubber gasket rather than cork to try aid it, and the bolts are def tight but not over tight but as you comment the stuff is so thin i can't stop it dripping out! not sure what to do to be honest but its really bugging me

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    Official RnS Addict fad15's Avatar
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    Clean the area with brake cleaner and then see where its coming from after its all clear of fluid. Take a look at the dip stick seal and the selector shaft seal where they go into the trans. Many times found a leaking dip tube seal that owners would swear was the pan gasket.

    If its cleaned with brake cleaner always look for the highest point of the oil stain/mark. If you can take a look at the converter and see if its got and fluid steak on its surface.
    We sometimes have to clean a trans 2 or 3 times to see where the fluid is coming from.
    built by hand NOT by computer

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    Official RnS Addict Perfect65's Avatar
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    I dont know these units but I assume they have a breather. I have eased or cured leaks on transmissions using trans fluid by adding a breather - run the pipe from the top of the box up high and loop it down where water cant get blown onto it and strangle with cable tie or wire it to make it just about breath. One of the best sealants I have used is Yamabond which is designed to fill up small gaps in crankcases but Ive used it in lots of other hard to seal places. Easy to clean off with cellulose thinners. If there is some around the bolts it will prevent them loosing off when done up to the correct torque.
    Greatest discombobulations to all my readers.

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