elgreco

ok here we go after an all day project (around 7 hours) finaly got the tranny and torque tube of the car
now this is what i found on the converter right where the shaft part meets the converter there is a gap about 1/8 of an inch,is this normal?
and by the way i found my whining noise

SMTCapeCod

Ow.
I'm new to auto 928s but that looks wrong.

Fortunately....perhaps...I know that a 'lister with a previously upgraded TC is selling it and for a great price.

Getting at the root cause is the important part though, and I'm afraid I"ll be following along to learn more about that as well.

Mrmerlin

what was the last thing you fixed?

SMTCapeCod

Sorry, but that made me snort up my soda a little bit...

At least the fixed term wasn't in quotes.

Scarce chance you'll get any better advice than what Mr M provides.

Bill Ball

Make a sig and put your model year in it.

It looks scored and worn more than mine, but the TC changed in 87.

What was the cause of the whining? I've had a bearing whine somewhere in the tranny that has been unchanged for 5 years and not the TC cover bearings.

Mrmerlin

from the looks of things the TC has been getting pushed into the front pump,
has the transmission ever been removed from the car?
maybe the wrong Tc was installed or a different front bearing housing

Black Sea RD

1. The outer TC bearing is missing its rubber shield and the ball bearings are now visible, and not many of them are left.

2. This machining could be due to the TC not being properly reinstalled all the way down into the transmission after a prior TC R&R. The WSMs have a specific warning about this very issue since you have to take specific measurements to ensure this after a TC R&R.

Do you know the history of your car?

Was there a transmission service done to it before you bought it?

Good luck,

elgreco

no history on the car , i found it under a blue tarp two years ago.
the tranny is shifting fine no sliping or any other indication of going bad. now i m kind stuck what to do what to do?
have the unit rebuild r get a tc and new bearing ?

elgreco

this is the tranny side

ammonman

My understanding is that the torque converter depth measurement is to ensure it is fully engaged and seated on both input shafts and the pump drive. One possible explanation for the wear if the trans is '84 and up (after the circlip and shims were eliminated from the engine end of the torque tube) would be the the front flex plate developed thrust pre-load from the usual method that leads to engine thrust baring failure, then the converter flange bearings started failing, thus allowing the pre-load thrust to push the converter hard against the primary pump face. If the circlips are in place in the torque converter housing axial movement of the drive shaft and torque converter should be restricted in the rearward direction by the torque converter bearings. This then puts all the axial load on the crankshaft thrust bearing. If the torque converter bearings or retaining circlips failed or were not in place then the thrust load could be transmitted backward.

Just a theory.

Mike

elgreco

i did remove the clip so i know that was there. now as far as the front part i did instal a PKlamp about a year ago , but maybe the damage was done from before

Podguy

Deal first with the obvious. The torque converted was pressed against the front pump. The torque converter bearings are shot. The only way I can see this happening if too much back pressure is applied from the torque shaft. Since you installed a new clamp I am assuming it was applied cold. The torque shaft can stretch and expand with heat. This would apply a force back on the converter. The force could easily destroy some marginal converter bearings.

Now I am guessing here, but the converter distance into the front pump is governed by the transmission design and if i remember some flat roller bearings. It should take a fair amount of pressure to get the torque converter to go beyond its limits. This suggests that not only the torque converter is hosed but so is the front pump which you should pull, disassemble and inspect anyway. If nothing else it will need a new o-ring. I think you will find the bearing under the pump is hosed too.

The torque converter bearing are 6008 - I think that is the number and readily available. Second party ones no matter the brand will be better than Porsche bearing. In fact all of the Porsche bearing, seals and rubber should be substituted when ever possible.

Good luck. I would be looking for a used transmission to rebuild at this point.

elgreco

Thanks for the input. My plan is to take the pump a part and inspect everything I there,if all looks good i will have the unit rebuild (even tho the car run perfect exept the whining noise). If I see something that I don't like then I'll get me a unit from a 89 s4 that I found for a reasonable price. Thanks again for taking your time to help out in my time of panic

dcrasta

you got your Transmission dropped in 7 hours? Wow. I need to follow your script. It took me over 12 just to get trans/rear xmember dropped.

Podguy

Unless you have rust it should only be a three to four hour job. It helps if you pull the torque tube at the same time. Or pull down the torque tube down and remove it from the trans.