Throttle Linkage problem - '73 220 Diesel - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 03-20-2012, 10:34 PM Thread Starter
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Throttle Linkage problem - '73 220 Diesel

Hi,

I've got a 1973 220 Diesel with just over 400,000 miles on it. It is a constant struggle - todays problem is the throttle linkage where the idle adjust cable connects. (see the photo attached to post)

Notice how worn the slot that the cable passes through has gotten over the years. The problem is the cable stop gets caught in that hole and when I take my foot off the accelerator and at a stop the engine races (rather significantly).

I have had this piece replaced maybe 15 or 20 years ago which is what I would do now if I could find one. A salvaged one might be better but this is the kind of part that also might be almost as worn on any car I would be able to find.

Does anyone have ideas on repair or sources for a good one?

Thanks,
Frank
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post #2 of 5 (permalink) Old 03-22-2012, 07:23 PM
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i'd put two or three nuts on the threaded end where wire cable comes out of sheath, or one nut with some loctite. make nut or nuts even with end of threads. might not look professional, but should work till you can find a better one
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post #3 of 5 (permalink) Old 03-22-2012, 08:23 PM Thread Starter
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Originally Posted by toofles View Post
i'd put two or three nuts on the threaded end where wire cable comes out of sheath, or one nut with some loctite. make nut or nuts even with end of threads. might not look professional, but should work till you can find a better one
Maybe I don't understand - but I don't think that would help at all. The issue is where the arrow is pointing - or actually under it. The cable is the idle adjust so when you turn up the idle adjust it pulls the cable and raises that piece of metal that has the slot in it - which raises the idle a bit. You can still step on the accelerator and it will slide up the cable no problem. All of that works fine.

The problem is really under where we can see in the photo, you can kind of see it on the top where the slot gets wider (it's supposed to be straight) but on the bottom the wear is much worse. The "stop" (that thing on the cable with the screw holding it to the cable) gets caught in the hole that has been worn in the center of the slot on the bottom.

The "design flaw" is this throttle linkage rotates in a circle and the cable is very stiff (it's a solid wire - where a bicycle break cable would be a braided cable for example). What happens is the throttle linkage bends the cable up when you have the throttle wide open (this happens surprisingly often on a 2.2 L diesel engine) then when you take your foot off of the accelerator the throttle linkage returns to this position but at the very end it will push the stop all the way down (this is were it will get it's maximum travel). So in normal use it is hitting the stop in the middle of the slot and it is sliding down the slot and it has just worn out this piece of metal.

Last edited by frankflynn; 03-22-2012 at 08:25 PM. Reason: typo
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post #4 of 5 (permalink) Old 03-22-2012, 10:37 PM
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Seems like you could find some kind of ferrule, flatten it to an oval to approximate the original slot size, weld/braze it into the worn area then grind it flat. Or maybe just weld/braze a washer to the underside of the bracket to keep the cable nut from moving and catching.

Are you sure the Classic Center can't get you the part?

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #5 of 5 (permalink) Old 03-23-2012, 01:05 PM
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throttle linkage problem

Sorry, it was my misunderstanding of problem. i thought the slot in linkage was
getting caught on the threads on the end of cable housing. this is my 76 240d
picture on left is throttle wide open and one on right is at idle.
is slot that the cable wore into the linkage getting caught on the cable and not
allowing a return to normal idle ?
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