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Leaking pneumatic governor diaphram will cause uneven idle, I think, and it should definitely hold vac. It is leather, and has worn and gotten holes in it.
I would not recommoned doing this yourself -- it is somewhat of a pain the sitting part to get the new one adjusted correctly (the thickness of the diaphram affects the governor rod length) -- you have to accurately measure the lenth of the pushrod as installed and add or remove shims to get it correct. You also run the danger of not getting it installed correctly and having the engine run away when started -- this has been know to happen on new cars, too, by the way! -- and it will destroy itself if you don't get the cap nuts loose on the injectors fast enough -- even two cylinders running can blow it up with an automatic. Manual you can usually kill with the clutch if you are fast. Take it to a shop and let them do it, the pump can remain in the car.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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