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#1
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Leaking 727
My newly rebuilt 727 is leaking from the dipstick tube. I was wondering if anyone else has heard of this problem and if I should have used some kind of gasket sealer on the O- ring ?
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#2
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Very common problem, but I've always replaced the o-ring. If the edge of the transmission hole has a sharp edge, it will easily cut the ring. I suppose RTV might work, but it makes a mess where non is needed.
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#3
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Yep...mine leaked badly too. New O-ring (even though the tranny was just rebuilt) ended up solving the issue.
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#4
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Coating the o-ring with petroleum jelly before installation usually helps to get a better seal. If the o-ring is new, could be that the o-ring hole is not in good shape (out of round, nicked, previously machined). If the o-ring is new, and a coating of petroleum jelly does not help, I would just get an o-ring that is one size larger. You can get one in the plumbing section at any OSH for like a quarter, and it's the same thing you get in these rebuild kits.
I've tried gasket sealer, and the results weren't very good. |
#5
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I had one that leaked too, even with a good "O" ring. I think the indent in the tube may have had a crack in it?
Anyhow, some of the killer Mopar Automatic transmission RTV (black stuff, forgot the part #) works great for sealing transmissions and is what the factory uses on the new cars tranny pans (no gasket needed.) |
#6
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I just used the clear Permatex RTV. It fixed mine right up, without having to pull the dipstick tube.
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