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  #1  
Old 09-14-2008, 04:46 PM
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How do you properly adjust the Throttle Linkage

Hello All,

I want to properly adjust the throttle linkages on my w123 300D Turbo. Is there a tutorial somewhere or perhaps a manual online on this?

Thanks for your help in advanced.

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Old 09-14-2008, 07:57 PM
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Unless you are way out of adjustment, I would look elsewhere for whatever problem you're having. I may have something in the other computer, tho.
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Old 09-14-2008, 08:09 PM
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Unfortunately the online manual site is gone. Also there is more than 1 style of linkage depending on what year and model you have.
When I first got my car the linkage was extremely sloppy and I had no Manual. I felt it was safe to adjust the linkage (under the hood) in 3 places. I started from the Gas Pedal up to the Fire wall.
Next On mine the pivot on the Fire Wall rotates a steel rod; on that steel rod I found a small bolt with a 10mm head and noticed that one of 2 parts it held together had an adjustment slot.
After that the linkages goes up to a complicated Bell Crank where the Cruise Control, Manual Shutoff and other stuff hooks to. I buy passed and left alone all of that as like you I had no manual.
After bypassing as stated above I went down to the Throttle Arm on the Fuel Injection Pump and shortened the length as much as I could and still allowing enough play so that it rested against the Idle Stop (you do not want the idle set with it hanging from the linkage, you want the throttle arm to rest on the idle stop).
Taking the slop out of those 3 areas allowed the Fuel Injection Pump Throttle Arm to move to the fullest of it's range. This gave me better response at the Pedal and more power.
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Old 09-15-2008, 09:20 AM
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ForcedInduction posted the manual here:
http://www.peachparts.com/shopforum/showthread.php?t=232254

There is a section with all the linkeage lengths for various models.
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Old 09-15-2008, 09:27 PM
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Quote:
Originally Posted by dannym View Post
ForcedInduction posted the manual here:
http://www.peachparts.com/shopforum/showthread.php?t=232254

There is a section with all the linkeage lengths for various models.
Looks like FI's zip file is empty. I think I have a .pdf procedure somewhere.
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Old 09-16-2008, 08:08 AM
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It's not empty. Download this:

http://rarlab.com/
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  #7  
Old 09-16-2008, 12:54 PM
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Quote:
Originally Posted by dannym View Post
It's not empty. Download this:

http://rarlab.com/
:

Actually, FI just posted the HTML menu as per topic of that thread. The .pdf is too big to upload. In fact I was having trouble uploading my .pdf, but had to converted it to these images to do so.




To CJ, I hope this helps. You might need a magnifying glass to read them.
Attached Thumbnails
How do you properly adjust the Throttle Linkage-om617.95xthrottleadjust1.jpg   How do you properly adjust the Throttle Linkage-om617.95xthrottleadjust2.jpg   How do you properly adjust the Throttle Linkage-om617.95xthrottleadjust3.jpg   How do you properly adjust the Throttle Linkage-om617.95xthrottleadjust4.jpg   How do you properly adjust the Throttle Linkage-om617.95xthrottleadjust5.jpg  

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  #8  
Old 06-22-2019, 12:35 AM
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Quote:
Originally Posted by Diesel911 View Post
Unfortunately the online manual site is gone. Also there is more than 1 style of linkage depending on what year and model you have.
When I first got my car the linkage was extremely sloppy and I had no Manual. I felt it was safe to adjust the linkage (under the hood) in 3 places. I started from the Gas Pedal up to the Fire wall.
Next On mine the pivot on the Fire Wall rotates a steel rod; on that steel rod I found a small bolt with a 10mm head and noticed that one of 2 parts it held together had an adjustment slot.
After that the linkages goes up to a complicated Bell Crank where the Cruise Control, Manual Shutoff and other stuff hooks to. I buy passed and left alone all of that as like you I had no manual.
After bypassing as stated above I went down to the Throttle Arm on the Fuel Injection Pump and shortened the length as much as I could and still allowing enough play so that it rested against the Idle Stop (you do not want the idle set with it hanging from the linkage, you want the throttle arm to rest on the idle stop).
Taking the slop out of those 3 areas allowed the Fuel Injection Pump Throttle Arm to move to the fullest of it's range. This gave me better response at the Pedal and more power.
Sorry to resurrect but I’m in desperate need of help. How did you reach down to the throttle arm?

I have about 1/4 inch of unused throttle until it can hit the WOT stop.

Last edited by Wusha; 06-22-2019 at 12:49 AM.
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  #9  
Old 06-22-2019, 01:07 AM
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Quote:
Originally Posted by Wusha View Post
Sorry to resurrect but Iím in desperate need of help. How did you reach down to the throttle arm? Do you pull the linkages or adjust while theyíre on the ball joints?

I have about 1/4 inch of free throttle until it can hit the WOT stop.
It might help if I knew what problem you were trying to fix.

The Throttle Lever is that lever on the Fuel Injection Pump. You reach down between the Fuel Injection Pump and the Engine Block (better when everything is cold) and simply keep it from moving. Then have someone slowly step on the accelerator and see how much play is in the linkages.

If you have play you also need to determine if the play is due to a worn out pivot mount on the fire wall or not.

See of you linkages matches the one in the attached pic where a bolt on the linkage is circled in red. You can take up some play by loosening that bolt and rotating the linkage and tightening it down.

Look for wear where the part on the one pic with the Green circle goes through the Metal.

The linkages with sockets have specific lengths that you need to reference in the Factory Service Manual. The measurements are from the center of the socket to the other center and can be done with the linkage removed.

There is another measurement/adjustment in the Factory Service Manual that requires a little metal disc to be inserted but I have never done that.

Someone will have to post the site of a free only W123 manual for you. Also there is more then one linkage setup.
Attached Thumbnails
How do you properly adjust the Throttle Linkage-linkage-adjustment-bolt.jpg   How do you properly adjust the Throttle Linkage-throttle-linkage-x-clip.jpg  
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  #10  
Old 06-22-2019, 01:22 AM
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When I press the pedal full throttle, there is about 1/4 inch before the throttle arm hits the WOT stop on the injection pump. Plus, when driving it takes 50% throttle to even get the car moving safely.


How stiff should the pivot mount be? It can wiggle but not much. I assume it’s cuz it’s a ball/round joint?

Yes same linkage as your pics. 1983 300d. Both red and green. The red 10mm nut is already adjusted all the way to the drivers side fender.




I guess I’m screwed. I tried adjusting the verticals linkage that goes from the red STOP choke to the injector pump throttle arm. I thought expanding that would help close the distance but it did nothing. My idle is probably ruined now. I haven’t ran it Due to lack of daylight.

I think I’m in Way over my head. I spilled oil inside the car trying to fix my tachometer...lol


Anyways the whole linkage assembly is just loose. I can’t find a manual to even identify what’s what. The ones I do find are so pixelated they’re not helpful. I’m a little to late for this game.

Last edited by Wusha; 06-22-2019 at 01:55 AM.
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  #11  
Old 06-22-2019, 01:58 AM
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Quote:
Originally Posted by Wusha View Post
When I press the pedal full throttle, there is about 1/4 inch before the throttle arm hits the WOT stop on the injection pump. Plus, when driving it takes 50% throttle to even get the car moving safely.


How stiff should the pivot mount be? It can wiggle but not much. I assume itís cuz itís a ball/round joint?

Yes same linkage as your pics. 1983 300d. Both red and green. The red 10mm nut is already adjusted all the way to the drivers side fender.

Yea Iím having trouble finding a manual locally.
There is a free online site that still works some members have posted for people. The one that I have in my notes no longer works. That would give you the lengths of the various rods.

You might try this without the Engine running. Pop the Linkage that goes to the throttle arm off of the Ball (you can use the top of it) and by hand push the Throttle lever and see if it goes all the way to the stop. If it won't go all the way to the stop then there is some other issue besides the linkage going on.

Can you seen enough of the linkages in my pics to tell if yours are orientated OK?

About 9 months ago I installed a new pivot mount. I don't think there was much play in it but I don't specifically remember. However, If you remove it and inspect it you would be able to tell more.
Once you get it off of the Fire Wall I bet you will find the Plastic is falling apart especially the Collar that goes through the metal part.

I have never messed with it as the Nut is rusted on to it but there is also an adjustment for the Accelerator Pedal linkage below the Pivot Mount and the Accelerator Pedal Linkages inside of the Car can also deteriorate.
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  #12  
Old 06-22-2019, 08:34 AM
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Quote:
Originally Posted by Diesel911 View Post

You might try this without the Engine running. Pop the Linkage that goes to the throttle arm off of the Ball (you can use the top of it) and by hand push the Throttle lever and see if it goes all the way to the stop. If it won't go all the way to the stop then there is some other issue besides the linkage going on.


I attempted to adjust the Adjustable Ball head shown in #4 of this image below.



Did not change much at WOT. Still a large gap at the throttle stop. In order to fully engage the throttle to the throttle stop, I need to push down on the vertical Push Rod (#41, FSM) that engages the throttle arm.
I know where the throttle arm is (on the Injector pump), but which one is the Throttle lever?

Last edited by Wusha; 06-22-2019 at 11:50 AM.
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  #13  
Old 06-22-2019, 12:58 PM
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"I know where the throttle arm is (on the Injector pump), but which one is the Throttle lever?" To me they are the same.

In the Factory Service Manual there is sometimes different words describing the same part in different locations of the manual. I am guessing it is an issue when they translated it from German to English.

I am not sure what the Ball Head in the manual pic is. I am guessing that is the Rack Damper Screw (Pin)/ Governor Idle Adjustment Pin" (Bosch and MB name) it has more then one name.
That part is to remove some of the engine shaking at idle. To adjust it you back it out then you adjust your idle with the idle adjustment screw on the engine side of the Fuel Injection to with in the idle rpms on the emission sticker. Then you slowly turn in the Rack Damper Screw (Pin)/ Governor Idle Adjustment Pin till it removes some of the shaking.
Ideally when you do that your idle speed does not increase. In practice your idle speed will will increase just a hair.

Just from looking at the first pic the Throttle stop looks like it is OK but there is a separate adjustment procedure for that.
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Old 06-22-2019, 01:52 PM
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CAn you describe the procedure please?
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Old 06-22-2019, 03:04 PM
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Quote:
Originally Posted by Wusha View Post
CAn you describe the procedure please?
In order to make that adjustment with the linkages attached the Throttle Arm has to be able to make it all the way to the stop. And, right now there is something keeping that from happening.


You could remove the Linkage from the Throttle Arm to make the adjustment providing that the Throttle Arm will go all the way to the stop. However, you have not said you checked that yet.


Let me know if the Throttle Arm disconnected from the linkage will actually make it to the stop or not.

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