I rebuilt the vacuum pump on my 240D (82) and I must have done something wrong, obviously! I lost ALL vacuum tonight and I mean ALL vacuum. I looked under the hood and saw the problem!

First off- my vacuum pump does not have the "diaphram" it has some sort of piston, o-ring, band, sorta thing. I put it all back together like I thought I was supposed to (only way it would go) tighter than "dick's hat band" but tonight the nut on top of the piston came right through the top of the pump! With the engine running you could see the threaded end of the piston shaft going in and out of the hole it created when it went "south".

What could have gone wrong? Could it be a problem with the end of the IP? I give up!

BTW, I was under my MB yesterday and did notice a tag. It had stamped on it- "MADE IN HELL"