Quote Originally Posted by TomTom
I have a 2002 E39 M5 with 97k miles. I have an engine tapping/knocking noise from bank 1. I don't seem to have any hesitations or power issues. I have replaced the main chain tensioner but the noise is still there. From digging on other forums it seems it could be the cam chain tensioner that is at fault. Has anyone had the cam chain tensioner replaced? I am looking for someone in Ireland that could help me diagnose and change the tensioner if required. Any recommendations?
It will be a bit of a trek for you but try Bryan Grieves of Dungorkin Auto's in Claudy near Derry.

He is a well known BMW specialist in these parts and works on ///M cars regularly. He did all the engine upgrades on my E36 M3.

He runs an E39 M5 himself so he know them inside out especially.

Really decent fella to work with.

http://www.dungorkinauto.com/