Hi all,
My vacuum pump is making this awful loud 'clackity clunking clapping' noise. Most noticeable when you take the oil cap off.

Here's a vid from another forum member that shows it perfectly:

Thread here

I'm scouring the internet trying to find a way to fix the noise. I recently replaced the timing chain and sprockets on my X5 3.0SD (35d) M57 engine. When I started it back up for the first time, almost had a heart attack hearing that noise. -Thought I'd gotten the timing wrong! But no, I ran the engine with the vacuum pump removed and noise went away.

It wasn't making the noise before I did the timing chain. So I assume it's something I've done. I've tried reseating it a bunch of times. New O-ring where it seals into the engine block. But still there. Just not sure.

Anyone know?

-Sim