Cause I cant find it in my haynes manual.



the problem im having is that it idles rough when warm. like shakes. my mechanic said its probably the fuel or the injectors so hes having me run redline 85 through it for a while to see if it clears up. The rough idle starts after its been driving a while and while stopped will go away if I put the car in neutral. and yes I did a search and found tons of stuff thats why im asking about the rack damper screw. I want to eliminate any and all culprits!



edit: it also goes away if I give it a tiny bit of gas. When the car is accelerating its super smooth.

Yes, the '82 has a rack damper. It is at the rear of the injection pump, just forward of the oil filter housing. Looks like a bolt with a locknut. Adjusting it can do wonders for a rough idle.

is there an online guide on how to install and adjust one? maybe a diagram?

Here you go.

http://engine.articles.mbz.org/diesel/rackbolt/

__________________
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section

To install a new one, just loosen the lock nut and unscrew the pin. You will have to angle it a bit due to the limited clearance between the pump and oil filter housing. When you install the new pin, stop when you feel the pin make contact, then adjust from there.
Here is what the 617 engine service manual has to say about adjustment:
"Loosen the counter nut. Adjust damper at idle speed, screwing damper in until transverse engine vibrations have been remedied. Then tighten counter nut to 20-25 Nm."
My personal experience suggests that better results are obtained with the engine at operating temperature, idling in "drive." If the pin is screwed in too much, the engine will be hard to start. So screw it in just enough to minimize the vibration, then stop.

I need to do mine....It idles smooth as silk in neutral...but shakes like a SOB in drive at idle....

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

ok guys where the best place to buy one?