1985 Mercedes 300D - Throttle Linkage Issue - PeachParts Mercedes-Benz Forum

marco5 · #1 01-02-2018, 04:35 PM

Hello again,

I've been looking at the docs online and can't find what I've connected incorrectly. The car does not shut down when I press "STOP" and only stutters. This happened after I disconnected it for a valve adjustment. Any ideas? Something is connected wrong here.

https://youtu.be/o8DL6XDhGJU

Marco

Alec300SD · #2 01-02-2018, 07:52 PM

Quote:

Originally Posted by marco5

Hello again,

I've been looking at the docs online and can't find what I've connected incorrectly. The car does not shut down when I press "STOP" and only stutters. This happened after I disconnected it for a valve adjustment. Any ideas? Something is connected wrong here.

https://youtu.be/o8DL6XDhGJU

Marco

The long throttle linkage that goes to the firewall on one end, has to have the other end with the retainig clip go through the nylon bushing on the STOP lever.

The end with the retaining clip is jamming the STOP lever in its current incorrect position

marco5 · #3 01-02-2018, 08:19 PM

THANK YOU! Can someone post of pic and circle where it's incorrect?

I am trying to determine the exact point of my mess up.

Alec300SD · #4 01-02-2018, 11:26 PM

The orange circled area (in the yellow circle) of the long shaft needs to go through the nylon bushing at the red dot in front of the red arrow.
Then the STOP lever will pivot correctly.

tangofox007 · #5 01-02-2018, 11:51 PM

Quote:

Originally Posted by Alec300SD

The orange circled area (in the yellow circle) of the long shaft needs to go through the nylon bushing at the red dot in front of the red arrow.

I don't think so. The rod appears to be correctly installed as pictured.

Is it possible that one (or more) of your rod ends was loose and became "unadjusted?"

BillGrissom · #6 01-03-2018, 12:03 AM

Nice looking engine, especially w/ no white aluminum oxide in Canada. What stops the fuel flow is the pulling up on the rod which goes down to the injection pump. I don't see the issue which Alec describes, though could be true. The Rube Goldberg linkage on top of the valve cover is to transmit the cruise control input, EGR sensing and such. It appears some designers had too many beers.

Did anyone remove the vacuum "shutdown valve" on the rear of the IP lately? If so, it might have been reinstalled incorrectly to push on the "more fuel" lever (is supposed to pull back on it).

You might remove the locking bolt (10 mm socket?) on the rod adjustment from the firewall, since that might be preventing full travel. Likely it was removed when taking off the valve cover. I post a photo of my 1984 & 1985 CA linkages in case it helps. Good luck, sounds like an easy fix.

Alec300SD · #7 01-03-2018, 01:58 AM

Quote:

Originally Posted by tangofox007

I don't think so. The rod appears to be correctly installed as pictured.

My bad, my first viewing of the video resulted in a WAG that was incorrect.

You are correct, the rod is correctly positioned.

The lower rod in the yellow circle (#74 in the diagram) appears to be missing a bushing (# 50) that clips into the STOP lever (# 48).
Excessive play from the lack of this plastic piece may prevent the STOP lever from functioning properly.

BillGrissom · #8 01-03-2018, 11:02 PM

I don't see how missing bushing #50 would affect the manual "stop" operation. That is on the "pedal input rod" which is just along-for-the-ride when you push the stop lever. That lever pivots on the bushing in part #21, and the IP input rod comes directly off the stop lever. You can quickly pop off all those extraneous linkages w/ a screwdriver to insure that none are preventing full rotation of the stop lever. Also, unbolt the pedal input rod, as I suggested in post 6. If you still can't stop the engine, something else is wrong. You never answered my question if you fussed with the IP shutdown valve.