Not quite sure what you mean but assume you refer to the 240D style
knob on the dash.
My 76 300D uses the setup where one turns the key and the orange
light comes on. When it goes out, I turn the key further just like
starting a gasoline vehicle.
When I stop it, I turn the key back like on a gasoline vehicle.
Except that in this case, it won't stop and I have to open the hood
and press down on the lever that says top.
My experience is limited to this car alone - my first and only MB diesel.
Randy
Ok, in that case, the vacuum posts all apply to your car. If the
locks work, then perhaps the vacuum shutoff on the IP is leaking.
You can identify this by taking loose the vacuum line to the IP and
put a vacuum gauge on it. If it shows 15-20 in vacuum when someone
turns off the key, then the system is working up to the shutoff, and
you will have determined that the vacuum shutoff needs to be replaced.
There are a bunch of how-tos and warnings about doing the shutoff
R&R. Be sure to heed the warnings.
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