I've got a 1982 240D. It's got 206k miles on it.

I was having a problem with the engine not stopping once the key was removed, so I started hunting for a leak.

I put a vac tester on the main brake line, and got a reading of 22 Hg. I started tracing fittings and dashpots, and found that the fourway fitting for the door lock actuator was loose.

But, I also noticed a little bit of oil in the vac lines. Not much, but a little.

So, I'm wondering if I need to rebuild the vac pump. I believe I've got a piston style vac pump (single line coming out the top of the pump).

Any help/insight you could offer would be greatly appreciated.

Oh...assuming I do need to rebuild the pump, does anyone have a step by step tutorial on how to do it? I checked the DIY links, and all the photo tutorials no longer work.

Thanks in advance!