I got a 05 cooper s. It had a rattle so i changed timing chain,ten,and guides but it still rattles. Need help thanks

 

It could be the belt tensioner. When they start to go, they get pretty rattle-y, too.

 

Did you "pop" the tensioner before starting the car? You will have a "death rattle" if the tensioner hasn't popped yet.

 

Can you describe the process needed to "pop" it?

 

We usually leave the valve cover off until the timing cassette and cover are totally finished, but you will go in from the top with a pry bar and find a fulcrum point and pry against the chain setting on the tensioner, it doesn't take much to pop the tensioner, so don't try to kill it.

You'll be able to see more of the tensioner exposed when it pops and the chain won't have slack in it anymore.

 

Thanks!

How about if you're just installing a new tensioner, and not replacing the rest of the system? Will the new tensioner just pop as normal once the oil pressure is correct? Or does it have to be installed & set up correctly first?

 

Can you possibly distinguish where it's coming from in the engine bay? I'd maybe check the belt tensioner, as said above.

https://www.northamericanmotoring.co...-question.html