I would like to adjust the idle on this engine (617.952), but according to the shop manual I need to unattach a pushrod that rises from near the idle adjusting screw to the angle lever at the top of the engine. The manual says to unattach it at the angle lever. I do not see how to do this. Any hints? I adjusted the idle screw first without unattaching the pushrod and it would neither slow down or speed up, so I guess they weren't kidding when they wrote that instruction.

Also, on top of the valve cover is an electronic switch device which has two wires attached to it. This switch seems to be tripped by the throttle assembly whenever the throttle is fully opened. What does this switch do?

Thanks,
Dan

To disconnect the linkage on the acceleraor just insert a flat bladed screwdriver between the link with the ball socket and the arm and twist the screwdriver which will pop off the link. Sometimes you need a pair of pliers to snap a stiff one back on. Mercedes recommends putting grease on these points.

I don't have the cruise control falderol on my car since I'm only 64 and can still press the accelerator, but I don't think there are wires going in there. I believe you're looking at vacuum lines. To see what the lines do, if I'm correct, check the little diagram on the cross member in front of the radiator.

Hope this helps.
Ben

Ben,

Thanks for the tip. I had no idea the ball end would just pop off.

The small flat plastic switch thingy on the valve cover has two thin electrical wires coming into it, and I don't see any vacuum lines into or out of it. On the aft end of the switch is a lever that must cause the circuit to either close or open when the accelerator is floored because that lever is only moved when the throttle mechanism has reached its stop.

Dan

That switch cuts out your a/c compressor on full throttle acceleration.

__________________
Jim