Throttle linkage adjustments for 300D (1975) - PeachParts Mercedes-Benz Forum

bgk202 · #1 07-15-2009, 07:56 PM

Does anybody have instructions on how to adjust the throttle linkages. There are two rods to adjust (one that goes to the inj. pump, and another that goes to the manifold side of the engine).

What does the linkage on the manifold side of the engine do?

Diesel911 · #2 07-15-2009, 11:09 PM

[QUOTE=bgk202;2247927]Does anybody have instructions on how to adjust the throttle linkages. There are two rods to adjust (one that goes to the inj. pump, and another that goes to the manifold side of the engine).

What does the linkage on the manifold side of the engine do?[/QUOTE]

If you look inside of your intake manifold and you have a Valve in there (a Butterfly Valve) attached to the linkage; it is there to create Vacuum for the Vacuum Governor on the back of your Fuel Injection Pump (you should also have a hose or tubing going from the Intake Manifold to the back of the Governor).
I would not mess with any off the Linkeage until you can get detailed info. Unfortunately my CD Manual is for a 123 not a 115 so I cannot help.

Diesel911 · #3 07-15-2009, 11:31 PM

If you want to buy the Service Manual on CD for $19.99+$7 shipping:

http://www.classictechlit.mbusa.com/MB/product.asp?catalog%5Fname=Retail&category%5Fname=1009%28ClassicTechLit%29&product%5Fid=QL%2D6516%2D0507%2D02%28ClassicTechLit%29

300D85 · #4 07-17-2009, 01:55 PM

Quote:

Originally Posted by Diesel911

I would not mess with any off the Linkeage until you can get detailed info. Unfortunately my CD Manual is for a 123 not a 115 so I cannot help.

When I recently purchased my 85-300D, felt like the throttle pedal had to be pressed half way before anything happened..

Thought it was normal until my more experienced friend showed me the linkages & I could see then that there was around an inch of play in the linkages from the pedal before the rod that actually increases the revs.. engaged.

Ended up eyeballing the whole setup & took out all the play to where I had pretty much instant throttle response & felt like a whole diff engine..

Then I ended up seeing in the FSM that there was a detailed procedure for setting up the linkages.

Though my engine seemed to be wonderful after taking all the play out of the linkages, what kinda things can go wrong not doing it right?