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  #1  
Old 04-04-2003, 11:39 PM
MS Fowler's Avatar
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Location: Littlestown PA ( 6 miles south of Gettysburg)
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OK--I'm confused, Auto Trans adjust.

I searched the forums and my Haynes manual, and I'm still confused....
My car is a 1982 240D ( 123.123) The automatic trans shifts a bit early, going into 4th at 50mph whereas, according to the markings on the speedo, it should stay in third up to 60. Other shifts are similarly early; at least as compared to the speedo markings.
First...are the markings on the speedo where it should shift at WOT?
Second, if I can raise the shift points, How do I do it? The Haynes manula has very clear instructions for adjusting the linkage that from the throttle to the transmission. My problem is that I can't find any such linkage. Were some of these made with vacuum information ONLY?--or has some PO removed the linkage (doubtful)?
Michael
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  #2  
Old 04-05-2003, 05:29 AM
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Location: uk
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i once owned a 123 series-280e-1982 model-petrol injeection.

this had an adjustable cable between the throttle linkage and autogearbox.

it also had a vacuum hose between the inlet manifold and autogearbox

i remember adjusting the cable and also replacing the perished hose-as i was experiencing lazy,delayed shifts.

my intereventions did help the shift to improve.

i could not say for certain whether the same system applies to the diesel 123 series car.

the other obvious thing is a fluid and filter change and fluid level check

hope you find this helpful
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  #3  
Old 04-05-2003, 05:37 AM
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http://forums.mercedesclub.org.uk/viewtopic.php?t=2743.

look at the above thread from a uk club site where a similar problem to your car is being discussed
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  #4  
Old 04-05-2003, 03:41 PM
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The 1980 on 240D had no cable control. It only had vacuum control.

The adjustment that matters here is an 8 or 10mm nut that holds the ball to the injection pump arm. From this ball is a link to the plastic proportioning valve at the rear of the injection pump.

With the motor off pull the linkage to full throttle. There is a full throttle stop built into the plastic proportioning valve. The lever that is moved by the link from the pump lever, should about hit that small roll pin that is the end stop, The 8 or 10mm nut allows the ball stud to be moved in a slot in the pump lever.

Do the full throttle thing and get a good idea how close the proportioning valve lever comes to that roll pin. Now adjust the ball in its slot "up" in small increments. I would start with about a .020" movement (about two thirds of a spark plug gap). When done you will have the WOT position of that proportioning valve lever closer to the end stop (to make the shifts later).
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Steve Brotherton
Continental Imports
Gainesville FL
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33 years MB technician
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  #5  
Old 04-05-2003, 05:51 PM
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Appreciation!!!

Thanks to all for the posts. Especially to Steve, one of the great things about this board is the willingness of pros to share their hard-learned experience. Too often pros don't share; its very refreshing, thanks again.
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