w123 auto box adjustment - MBClub UK

stuarth · 08-06-2012, 12:15 PM

I have a 240td with autobox (1981). It has only 80k miles from new. WHen the car changes gear from say, 2nd to 3rd, it overrevs a bit before the next gear is selected. I am told there are two adjustments - one determines WHEN the gears cganfe and the other determines HOW quickly or smoothly it changes. I beleive the latter is an actuator screwed into the side of the gearbox but this is all I currently know.
Can anyone enlighten me on how this works and how to adjust things assuming my diagnosis is right?
thanks

stuarth · 08-06-2012, 12:23 PM

I may have found the solution on Youtube here
Mercedes Diesel Transmission Adjustment - YouTube

Perhaps you can look at this and tell me if it is the same for my car? Seems pretty simple if it is right

**jaymanek** · 08-06-2012, 02:04 PM

Very similar but the adjustments are very hit and miss... I once wasted a complete saturday adjusting, test driving, adjusting and on and on..

stuarth · 08-06-2012, 06:00 PM

Anyone have any ideas about how to make it non-hit and miss? There must be some sequence in which this has to be done and presumably the video has this right but also some adjustments? I would be tempted to take out the gearbox actuator first to see if it works.

krimat2005 · 08-06-2012, 07:44 PM

check this out
http://avtopedia.ru/akpp/722-3%20722-4.pdf

stuarth · 11-06-2012, 12:45 PM

If I change the vacuum control unit on the gearbox, does it have to be the same colour coding as the one I remove? The only one I seem to be able to get in France is the GREEN coded one.

krimat2005 · 11-06-2012, 08:13 PM

yes it has to be the same colour, and after that you have to check/adjust working presure. all in the link i posted couple days ago.

08-06-2012, 12:15 PM	#1
stuarth Member Join Date: Jul 2006 Posts: 55	w123 auto box adjustment I have a 240td with autobox (1981). It has only 80k miles from new. WHen the car changes gear from say, 2nd to 3rd, it overrevs a bit before the next gear is selected. I am told there are two adjustments - one determines WHEN the gears cganfe and the other determines HOW quickly or smoothly it changes. I beleive the latter is an actuator screwed into the side of the gearbox but this is all I currently know. Can anyone enlighten me on how this works and how to adjust things assuming my diagnosis is right? thanks

08-06-2012, 12:23 PM	#2
stuarth Member Threadstarter Join Date: Jul 2006 Posts: 55	I may have found the solution on Youtube here Mercedes Diesel Transmission Adjustment - YouTube Perhaps you can look at this and tell me if it is the same for my car? Seems pretty simple if it is right

08-06-2012, 02:04 PM	#3
jaymanek Authorised Forum Sponsor Join Date: Nov 2002 Location: Nuneaton Warwickshire Car: Lots of Mercedes! Posts: 14,488	Very similar but the adjustments are very hit and miss... I once wasted a complete saturday adjusting, test driving, adjusting and on and on..

08-06-2012, 06:00 PM	#4
stuarth Member Threadstarter Join Date: Jul 2006 Posts: 55	Anyone have any ideas about how to make it non-hit and miss? There must be some sequence in which this has to be done and presumably the video has this right but also some adjustments? I would be tempted to take out the gearbox actuator first to see if it works.

08-06-2012, 07:44 PM	#5
krimat2005 Hardcore MB Enthusiast Join Date: May 2009 Location: Littlehampton, West Sussex Car: Mercedes W124 300D Posts: 200	check this out http://avtopedia.ru/akpp/722-3%20722-4.pdf

11-06-2012, 12:45 PM	#6
stuarth Member Threadstarter Join Date: Jul 2006 Posts: 55	If I change the vacuum control unit on the gearbox, does it have to be the same colour coding as the one I remove? The only one I seem to be able to get in France is the GREEN coded one.

11-06-2012, 08:13 PM	#7
krimat2005 Hardcore MB Enthusiast Join Date: May 2009 Location: Littlehampton, West Sussex Car: Mercedes W124 300D Posts: 200	yes it has to be the same colour, and after that you have to check/adjust working presure. all in the link i posted couple days ago.

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