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Discussion Starter #1
Looking for help identifying an engine whirring noise that started recently when the engine is cold and reduces as it warms up. Working on the drive so haven't yet used a stethoscope to try and locate the source.

Open to opinions and personal experiences, worst case I'm guessing timing chain(s) need replacing?

Video recording of the noise ...whirr, whirr, whirr, whirr

Thanks
 

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ive had old cars in the past that have had a bolt holding the cam housing come loose,thus shifting the cam housing, and the belt touching the moved cam housing,,,but this sounds different,,sounds like something rubbing on plastic,,have all the belts been changed ? also ive heard the old n47 chain rattle and it dont sound like this,,although the chain is situated in a different part of engine.
 

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Discussion Starter #5
Thanks for the suggestions.

Stripped off the engine acoustics and using a stethoscope but no closer to pinpointing the noise. Will check more when it is light again tomorrow.

@rasa golf, no belts/pulleys changed, but they are on my list to do soon, will pull the fan tomorrow and check them
@demonist, no change disconnecting the brake vacuum hose
@Redballs1, no change disconnecting the vacuum line from the EGR valve
 

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Discussion Starter #6
Belt & Pulleys all checked out okay. No visible wear on crank vibration damper or play. Disconnected injectors one at a time but no change to the noise.

Noise is loudest at the rear top of the engine where the camshaft sprockets and top timing chain run but the chain itself sounds like it is running smooth?!

Have heard a couple of videos with a similar noise that was the timing chain and I think the N47/N57 have the same design?
N47:
525D N57:

Will probably pull the intake, injectors and cylinder head cover next for a visual inspection.

If it is the timing chain I don't think I'll do the fix myself though (my driveway is gravel & it's winter)...
530D DIY:
 

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Discussion Starter #7
Fixed, timing chains replaced with BGA kit from PMP cars Nuneaton, 2 day job gearbox out method.
 

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Pleased you got it sorted. What was it like to do and did you need any specialist tools?
Cheers
Jim
 

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Discussion Starter #9
I paid PMP cars to do the work, price on their website, as dropping the gearbox in winter on my gravel drive was not an option for me. Apart from that it isn’t too bad based on the videos from the guy who did his 530d (linked above) and he lists the parts and tools he needed in those.
 
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