: Transmission fluid leaking out of top of breather tube at the track - how do I fix?



repenttokyo
01-04-13, 04:14 PM
My last track session, I realized that transmission fluid was blowing out the breather tube at the top of the transmission. Is there any way that I can prevent this from happening in the future? Note - tranny temps never got super hot, and it was a near-freezing day on the track.

Also, is there a way to add a remote fill to the transmission so I can top it off more easily?

Thanks!

repenttokyo
01-06-13, 12:39 PM
Am I the only one who has ever had this problem occur during track driving?

OneFast V
01-06-13, 02:14 PM
I have never experienced this issue. what were your tranny temps reading during the track event?

repenttokyo
01-06-13, 02:19 PM
Tranny temp was 194 degrees. The fluid was sloshing out the top of the tube and covering the underside of the car in the immediate area. I noticed it after my third session when there was a puddle under the car. Not a ton leaked out, but enough to make me cancel my fourth session of the day, and there was a good coating on the tranny itself. i am using Amsoil Torque Drive ATF.

OneFast V
01-06-13, 02:22 PM
Tranny temp was 194 degrees. The fluid was sloshing out the top of the tube and covering the underside of the car in the immediate area. I noticed it after my third session when there was a puddle under the car. Not a ton leaked out, but enough to make me cancel my fourth session of the day, and there was a good coating on the tranny itself. i am using Amsoil Torque Drive ATF.

Is it possible you were overfilled to begin with?

repenttokyo
01-06-13, 02:24 PM
I don't think so - because I had the car on a different track a few other times in the weeks leading up to this event, and there was no leakage.

Although - the track where it leaked (NHMS) has two big uphill sections, which could have caused fluid to spill if it was indeed overfilled...

darkman
01-06-13, 02:41 PM
I don't know what the vent looks like other from an exploded diagram. If the vent will accomodate a rubber/plastic tube you connect it to an overflow tank. Canton Racing, among others, has overflow tanks that might work for this.

PISNUOFF
01-06-13, 02:55 PM
Mine blows out of the breather tube on the street as well as the track. I haven't looked too much into it.

repenttokyo
01-06-13, 03:30 PM
My biggest concern would be blowing out enough to jeopardize the proper lubrication of the transmission. Should this be something I should worry about?

Thanks for the overflow tank suggestion, Darkman.

01Cummins
01-08-13, 08:11 PM
Mine was blowing out of the tube on the freeway. I dumped a little fluid out of and extended the tube up the firewall to the top of the motor. We will see what happens...

riverjamie
02-19-14, 05:26 PM
Hi everyone just did a google search for ATF coming out of GM 5L40e transmission breather. I have a 2000 528i with 120k. When the car is mainly cold and it seems in reverse it will at times leak ATF out of the breather. It might also be doing it in drive also but not sure. Example the other day had the car up on my drive up ramps for 4 days while doing some work. When I backed it down and backed it out of the garage it leaked ATF about 1 inch in dia which then became about 6 inches after sitting a while. It is definitely coming out of the breather on top of the transmission where the bell housing meets the flat part of the transmission. My son gave me the car, before that he also had the problem backing out of his step driveway. He had it serviced but the ATF was very dark, and I don't think the shop did a full flush. So I put in some Seafoam Transtune for 2 wks, then did a FULL FLUSH THROUGH THE COOLER RETURN LINE AND INSTALLED A NEW FILTER. It did not leak for about 1 month then it started off an on. It does not have to be hot for it to leak. The breather cap seems to float around so I don't think it's gummed up. 3 independent trany shops say it has to be rebuilt. But I hesitant because it shift good and is not noisy. None of them know what the exact problem is.

So thanks for reading, and just curious if someone has a cure for this. I thought about trying to remove the breather and install a tube up the the engine compartment. Not sure if this will solve anything?

Naf
02-19-14, 10:52 PM
Remove the tube and replace it with a hose and catch can this way ur not spillin oil

repenttokyo
02-20-14, 12:49 PM
i can't reply to your message because your mailbox is full.

My CTS-V - like all 2004-2007 CTS-V sedans - has a T56 manual transmission. I am sorry I can't help you with your problem.

Try the regular CTS section of this forum.