Answer from MR I CHOUDHURY:
No, it has a cam chain (runs inside engine housing) not as a rubber belt as normal engines. This is valid for M57 and M57N engines as far as I know.
It does not have a cam belt. It has a chain like all bmw's which never requires changing
much more quicker people say
yes
it has a chain
It uses a cam chain.
If i remember right the BMW diesels have cam chain.
You can purchase the BMW 330d directly from a BMW dealer, I imagine. Otherwise you can try eBay Motors and other similar sites. Also try used car dealers.
chain
No, it is a chain.
Timing chain.
Yes. Not a chain.
Chain