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  #1  
Old 04-16-2009, 05:57 AM
88Black560SL
 
Join Date: Oct 2004
Location: CT
Posts: 3,513
722.6 Hard down shifts after overhaul

Hello

I just completed the overhaul on my 1996 SL600 722.6 transmission. One of the things I did and probably shouldn't have was cleared all adaptation values. The transmission runs fine with the exception of the 2-1 and sometimes 3-2 downshift is hard. I am aware that this particular year had a valve body update to cure the 2-1 problem which I did not do due to cost. But this down shift is sometimes so hard I find it difficult to believe that the transmission ever went into production like this in a Mercedes.

I'm thinking maybe it needs time to re-adapt. But how much time is required. Ive already driven the car about 300 miles.

Also thanks for all the previous advice I got on this forum in overhauling this transmission.

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  #2  
Old 04-16-2009, 07:59 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
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To "quickly" re-adapt the trans..

You must allow the trans to shift thru the gears keeping the RPM's under 1800 on all shifts.
You must do that 4 times & then allow the engine to idle for 10 minutes.

If you select each gear manually it will re-adapt quicker.
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  #3  
Old 04-16-2009, 06:52 PM
88Black560SL
 
Join Date: Oct 2004
Location: CT
Posts: 3,513
Quote:
Originally Posted by M.B.DOC View Post
To "quickly" re-adapt the trans..

You must allow the trans to shift thru the gears keeping the RPM's under 1800 on all shifts.
You must do that 4 times & then allow the engine to idle for 10 minutes.

If you select each gear manually it will re-adapt quicker.
Thanks again MB Doc I will give it a shot.
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  #4  
Old 04-18-2009, 10:07 PM
88Black560SL
 
Join Date: Oct 2004
Location: CT
Posts: 3,513
MB-Doc procedure worked real good. The car is staring to run like it has a Turbine Engine

Thanks

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