Engine noisy at 1700 revs noise changes at different revs

Hi, brilliant feed back here,Brilliant forum really interesting,I have a x5 3ltr petrol 02 reg,i have a problem with a ticking/knocking noise,Got quote for parts before finding this forum,Engine noisy at 1700 revs noise changes at different revs,But does changehigher up the revs, hear it when parked but not on road, comes up with quite a few fault codes,sensors etc would timing chain or tensioners cause this diagnoses,look forward to hearing from you, before going to costly extremes thanks.

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW Lower Chain Tensioner Replacement

[Nick at Pelican Parts]

Timing chains will cause a rattle, not usually a tick. if the noise has been diagnosed, offering that info here would be helpful.

- Nick

[Bill M.]

Hello Nick.
I could use advice, instructions, tips on X5 4.8L timing chains and guides replacement, hopefully with engine in car. any help is appreciated.
first question: once front lower timing case cover removed, can the oil pump chain be removed with engine in car, oil pans still in place?
thanks in advance