rexpontius

Today when I came home from a nice drive with the 928, I backed up the car onto the driveway when I smelled some ATF oil.

I could not believe my eyes when I looked unter the car, the ATF oil came running out of the tranny at an alarming rate.

Looking at the public pavement there was a clear trail of oil from the road to my driveway , so I guess first thing I have to do tomorrow is find a way to clean that up. Any suggestions are welcome.

I quicky jacked the car up and noticed the large rubber gasket had a very small crack in it where the oil was leaking.

The gasket has been replaced 1,5 months ago, so maybe I overtorqued the bolts or it was just a production problem.

Anyway, I know what I will be doing in my days off next week....

jpitman2

It helps to have year amd model. Assuming its a 4 speed AT, you are a victim of Porsche spares not keeping up with MB parts for that gearbox. MB superseded the gasket a LONG time ago (1994) to avoid exactly this problem - see this post - it lists the correct gasket number.
https://rennlist.com/forums/928-foru...et-failed.html.
Go back to whoever sold you the service kit and demand a refund, and some ATF, and the RIGHT service kit.
jp 83 Euro S AT 52k

SeanR

I have seen a few of the new ones fail due to over torquing. They are easy to split.

auzivision

Kitty liiter and a broom if it's still wet followed by 50/50 simple green and a power wash.

Bummer about the leak, but luckily it happen close to home before any other damage.

rexpontius

So today I phoned the Benz dealer and ordered a new gasket 126 271 11 80.

I can pick it up tomorrowmorning for the stunning price of EUR 3,84

Also managed to clean up the pavement with some special cleaning solution thank goodness.

Now all I have to do is save up some positive energy to start the job of replacing the gasket and filling the box up again.

Any special tips on the easiest way to fill it without being on a lift? ( Last time I put it on a lift in the garage of a friend of mine, and still it was quite a PITA )

Oh, and if I remember correctly the torque for the bolts is only ~8Nm?

Cheers
Michel

auzivision

You can use a funnel and long hose or hand pump it in with one of these:

http://www.acehardwareoutlet.com/pro...rce=GoogleBase

That’s a lot of hand pumping. I remember seeing a trick some did with compressed air and a special cap with a tube that reached the bottom of the container.

rexpontius

Today I replaced the gasket, and surely the old gasket was a 10 80 version.
I was split over a section of more than 1 inch.

Installing the new gasket was very easy, and I made sure to not overtorque the bolts :-).

Filled it up with new ATF using a hand-pump, which worked great actually.

Miraculously also the gearbox now uses the first gear with the selector in Drive!
I did use a different brand of oil, but the old oil was also Dextron IID, so should have been fine.

Anyhow I am very happy with the results.

cheers

Tails

Good work you appeared to have hit all the right aspects.

Been there done that and got the "T" shirt.

I have a spare pan gasket in my garage, just in case.

Tails 1990 928S4 Auto

rexpontius

Yeah, everyone working on these gearboxes with success should at least deserve a t-shirt.

They will need it too, as the t-shirt they were wearing during the job is probably ready to be trashed because it is so smelly from the ATF Oil.
That stuff really stinks !

Checked this morning for leaks, but fortunately seems perfectly dry!

dr bob

If your ATF really stinks, be sure to samle and sniff the new stuff after a bit of driving. If it gets darker coplored and stinks with any burning component to the fragrance, get the car to a MB trans specialist soon as possible to confirm proper adjustments and operation. Burned fluid is a symptom of slippage, and becomes a problem itself when it doesn't lubricate well. The deposits and varnish from the burned fluid will cause hydraulic problems that can lead to more slipping and more sever fluid burning. Slippery slope, get to it early and save th etrans before there is any serious damage.

For those playing along at home, don't forget that ATF needs to be changed at around 25k or maybe 3-5 year intervals. Don't wait for a problem to remind you.

rexpontius

the old oil (only 1,5 months old) looked like new.

The ATF oil stinks when it is still in the can.

I believe it is because of some sort of sulfur component in it.

But off course, your advice is still very good.