Osmosis

OK, I hope to God I did not screw up my transmission. I just got started putting my engine together and started to sort parts and re-organize my garage. I drained my transmission fluid and thought it would be a good idea to blow the transmission lines free of any contaminated transmission fluid.

I found the return line, put 80 to 100 psi via my air compressor and got some fluid out as I saw it dripping out of the pan. I then went to the feed line that goes to the transmission from the radiator....bad idea...I"m just hoping nothing can go wrong here. I put some pressurized air to the line for maybe 3 seconds, then I heard a Pssst as the air relieved it self and oil came out of the front of the transmission.

OK, NOW, I'm kind of freakin out! I'm hoping I did not Efff something up.
After an hour, I put some pressure back into the return line to see if it was holding pressure or spewing oil out the front pump. The good news is that it is holding pressure. I put the air line on it for about 1/2-1 second then removed the line to relieve the pressure. No oil dripped out the front shaft and no air was passing by that I could hear... I've always owned Chevy's for my hot rods and this is my first (2nd) German car and I'm not to familiar with them. Looks like oil is coming out between the input shaft and the spline gear shaft that that surrounds the input shaft. From the outside inward, I see the larger shaft with splines on it and inside that is the input shaft. Oil leaked out between these two I think. I have a pump shaft seal but no need for it as it is not leaking from here that I can see.

Any help would be greatly appreciated

Osmosis

For future references, I.E. Search, I spoke with 2 Audi tech's and my personal transmission builder. All said that pushing Air through the feed line from the radiator most likely will not have caused any damage to the transmission. Not the best thing to do, my mistake but, no harm done

As for the transmission rebuild, that will be another day!

Time to get this beast on the road

4Driver4

I sounds to me like the air escaped around the torque converter seal. I'd be worried about that, and I'd replace it just to be sure.

Osmosis

My seal looks fine. The fluid came out between the input shaft and the stater shaft. the seal is on the outside of the stator shaft. I think its fine. I put some compressed air to it again for 1/2 the time to see if the line would hold pressure and/or show me possible leaks. When I pulled the compressed air away from the line, I noticed no leaks or bubbling around the shaft seal, or pump assembly. If my transmission guy would rebuild ZF transmissions, I would have pulled it. Like I said, that's gonna be another day.