Transmission leaking from the tube
#1
Transmission leaking from the tube
My transmission losing transmission fluid from the filler tube where is going in the transmission. the rubber bushing was bad and I thought that was causing the problem. I changed it out and fluid was still coming from it. Now this apprears to only happen when the transmission has sat for a few hours or a day or so. I next bought a new Tube and bushing and the same thing happen againl I am not overfilling. It doesn't come out of there while I am filling however. It appears to me like there is pressure coming from some where and it is making the fluid come out. Any suggestion?
#4
The full level is even with the pan rail when hot and running. When you turn the engine off the fluid drains from the converter, valve body, etc. and will be higher after sitting. I would check that kick down cable like suggested. They are notorious for leaking on a TH350.
#5
I have been wondering about this - thanks for the info. Looks like no seal replacement until it is drained...
#6
the full level is even with the pan rail when hot and running. When you turn the engine off the fluid drains from the converter, valve body, etc. And will be higher after sitting. I would check that kick down cable like suggested. They are notorious for leaking on a th350.
#7
The 400 has a kickdown switch, rather than the cable.
Is it possible you accidently damaged the tube seal upon installation?
I did that to an old motorcycle seal. Had to change it twice to fix it. Old seal looked fine though!
Is it possible you accidently damaged the tube seal upon installation?
I did that to an old motorcycle seal. Had to change it twice to fix it. Old seal looked fine though!
#9
TH400 originally came with a o-ring seal on the tube. The grease idea is good. That seal can snap, twist, etc in there so just be easy. You can also try different o-rings. That hole is .755-.758 in diameter so an o-ring with an outside diameter of .750 will work. You'll have to work out the thickness on your own but I would cheat toward the thin side so as not to twist/split it. On some of their dipsticks Lokar suggests using RTV just under the metal collar on the dipstick so it seals against the outside of the case as you drive it in. Just make sure you have the upper end of the tube supported.
For some reason I thought we were talking about a TH350 so disregard that kickdown cable talk
For some reason I thought we were talking about a TH350 so disregard that kickdown cable talk
#11
th400 originally came with a o-ring seal on the tube. The grease idea is good. That seal can snap, twist, etc in there so just be easy. You can also try different o-rings. That hole is .755-.758 in diameter so an o-ring with an outside diameter of .750 will work. You'll have to work out the thickness on your own but i would cheat toward the thin side so as not to twist/split it. On some of their dipsticks lokar suggests using rtv just under the metal collar on the dipstick so it seals against the outside of the case as you drive it in. Just make sure you have the upper end of the tube supported.
For some reason i thought we were talking about a th350 so disregard that kickdown cable talk
For some reason i thought we were talking about a th350 so disregard that kickdown cable talk
Last edited by Gary's 2 442-S; July 21st, 2011 at 10:24 AM.
#12
Resurrecting an old thread ... On a TH350 > replaced the standard O-ring on the dip stick tube with a #11 O-ring (3/4" x 9/16" x 3/32"), and to insure a good seal, I added an additional O-ring under the collar of the dip stick tube which seats into the lip of the transmission. The additional O-ring is size #40 (3/4" x 5/8" x 1/16"). I tightened the dip stick attachment bolt to the transmission case while holding the dip stick tube down firmly onto the transmission to make a tight seal at the top edge where the tube inserts into the transmission. No need for RTV. It looks like it was meant to have 2 O-rings since there is a small lip on the top edge of the trans where the tube inserts. Now I have two O-ring seals and it works great. No more dip stick tube leak.
Last edited by Toms cutlass; July 6th, 2016 at 10:31 AM.
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