engine and drivetrain Engine rattle only at 3100 rpms...

[JohnP]

.....yer timing chain tensioner is sheit .

Hmmm, could be.

[gracer]

I think CD has the answer. G

[Ferret2002]

Bloody hell. I'll rip off the cover and check. Thanks.

[InkaSteve]

Is that a Corgi hanging out of your car??

Here is mine complete with Roundel eyes. Corgis and 02s just go together.

[Ferret2002]

Yes yes it is a corgi....ive always bloody wanted one...

So out of curiosity i lifted the chain cover and saw this....what the hell is this and how did it happen?!

[Tommy]

So out of curiosity i lifted the chain cover and saw this....what the hell is this and how did it happen?!

Hmmm, I don't see anything wrong there. I see chain and the upper end of chain tensioner. It's rubberized metal and to me it looks ok in your picture. Is it worn. If you move the chain can you see bad grooves on the rubber surface? Then there is the "bowl" of oil. In the oil you should find the end of tensioner piston. Is it positioned correctly to the guide? Then open the plug on side and check the spring and the piston. Is the chain guide on the other side of chain ok? They tend to break at the upper end sometimes.

Here's all the parts

http://www.realoem.com/bmw/showparts.do?model=2551&mospid=47129&btnr=11_2372&hg=11&fg=25

Tommy