After reading all the threads about failure of the old style vacuum pump and the fact that mine was leaking oil and spraying it everywhere, I decided to change the pump on my OM602. Because I'm a cheap student and thought it looked like a good deal I bought a pump from ebay for £35 (about $70) and put it on. The pump was marked "YS" and manufactured in 2007. From the moment I put it on it made a pretty bad knocking noise which I hoped would go away after a few miles. Well, it didnt. I lost all vacuum assist while driving down the road, luckily it was on a dual carriageway so I could just puill off the next junction and engine brake down to a slow speed. I carried the old pump with me in the car because I was expecting the new one to fail, so just swapped them over on the side of the road. Heres some pics of the new pump:







Quite lucky it didnt let go really! I emailed the aby seller and theyre going to send me a new one, hopefully this one will be a bit better.