BMW X5 E53 (03) Strange metal knocking noise from crankshaft pulley

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Good evening All,

Lets set the seen I have already replaced all the pulley and tensioners including the PAS and Air Con pump then I still hear I squeaking noise when the engine starts and stops for no more than 2 seconds.

So I replace teh crack pully and everything would appear ok.

Then 1 week later I turn her on and it sounds like a bearing rattle once she is warm everything is ok.

There is plenty of oil in the system, and when she is warm all is ok.

So checked all wheels on the front, and decide to replace water pump, only thing left is alternator.

Same issue but not as bad.

So run the engine with nothing connected and I hear nothing the issue only occurs when belt connected and under load.

It is winning so far but I refuse to let it win and pass it over to the dealer.

I am more concerned if there is any damage but everything seems ok.

Any advise on the crankshaft would be appreciated.

She has done 122miles and going strong..

Regards,
Stuart