× Welcome to the 928 Owners Club Forum!

Tell us and our members who you are, what you like and why you became a member of this site.
We welcome all new members and hope to see you around a lot!

1980 928 ATF level Question

  • Shanman03
  • Shanman03's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
More
01 Mar 2017 16:32 #19560 by Shanman03
1980 928 ATF level Question was created by Shanman03
Purchased my 1980 928 just 2.5 months ago as a Christmas present to myself.

Noticed a slight ATF leak. Recently noticed initial slow response in gear shift until few minutes after start up, assume until ATF gets warm. Checked ATF level thinking was low and actually looks high.

Please see attached photos. Is the ATF level too high? Level should be in the notch, correct?

If too high could that be causing overpressuring and the leak? Hopefully it hasn't caused any major damage to seals

Should I remove ATF fluid unitl at the notch level? from what I have read online ATF fluid in 928s is very sensitive.
Thanks for the help









This message has attachments images.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

More
14 Mar 2017 10:34 #19583 by mm928
Replied by mm928 on topic 1980 928 ATF level Question
You did not mention the procedure you used to check, but you have to have the car running to check the ATF. If it is not to the top when not running you are likely already too low! So start the car and check it if you see no or very little oil, then you need to add some.

You will likely need to get the car up on jack stands (with lift bars preferably as well) because you also have to add the oil while it is running! otherwise it will never be enough when it sucks what is in the gauge into the tranny.

The procedures etc are in the library or tech discussion section. Also check that everything is tight while you are under there.

1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -
The following user(s) said Thank You: Shanman03

Please Log in or Create an account to join the conversation.

  • Shanman03
  • Shanman03's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
More
28 Mar 2017 07:35 #19609 by Shanman03
Replied by Shanman03 on topic 1980 928 ATF level Question
MM928 Thanks for the help. Last weekend I put in about 1-1/2 quarts of new AT Fluid to get it to the right level with the engine on and transmission in neutral. Shifts gears much smoother as expected.

I checked the main seal bolting and all tight. Any experience with Trans-X stop leak? A guy in my neighborhood swears by it, but I wanted a good 928 opinion on stop leak in transmission before I put any in. The leak is very minor, must of taken years to leak out 1-1/2 quarts. Not a big deal to add some ATF every year or so.

Please Log in or Create an account to join the conversation.

More
29 Mar 2017 11:32 #19614 by mm928
Replied by mm928 on topic 1980 928 ATF level Question
Prevailing wisdom for me is not to use additives, especially for the Tran or motor. live with a slight leak if it is otherwise running fine, or fix the leak. These are very solid Mercedes trannys and if they are working ok I would tend to leave them alone. Just keep checking all the connections, clean them well first then look for the leaks. Might just be a seal you can replace.

Have Fun!

1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -

Please Log in or Create an account to join the conversation.

More
09 Apr 2017 11:53 #19630 by Rich928
Replied by Rich928 on topic 1980 928 ATF level Question
Find attached the factory recommended process for checking AT oil level.

Rich
Membership Chairman
Charter Member
1993 928 GTS Cover Girl
1987 928 S4
1979 928 5-speed rescue
1979 928 5-liter track beast

This message has an attachment image.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

More
09 Apr 2017 11:57 #19631 by Rich928
Replied by Rich928 on topic 1980 928 ATF level Question
For those of you who have a 4-speed automatic transaxle, these are the factory's words.

Rich
Membership Chairman
Charter Member
1993 928 GTS Cover Girl
1987 928 S4
1979 928 5-speed rescue
1979 928 5-liter track beast

This message has an attachment image.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

Moderators: Rich928mm928billvvOC

Don't have an account yet? Register Now!