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E34 M5
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Discussion Starter #1
Greetings gentlemen!

I've noticed a strange noise from the engine, anyone has an idea what that could be?
Car is done 295 000 km's :)

Thank you!

Video of sound:
 

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You may need to be more specific about the noise. A longer video might help. Any efforts to pinpoint it; louder on the top end, or either side? Goes away when warm or with some revs?
 

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E34 M5
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Discussion Starter #3
Thank you for reply!
My bad!
I will try to make other video, car is parked away for the winter.
But it sound like a diesel engine, or kind of. It is hard to describe it.
The sound is constant i would say, just when the engine is cold, then it is a little quiet
You may need to be more specific about the noise. A longer video might help. Any efforts to pinpoint it; louder on the top end, or either side? Goes away when warm or with some revs?
 

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295.000 km = was the chain tensioner ever upgraded or
re-newed ?? In any case a timing chain lengths control
is highly recommended to check if it is still within the limits.
Is the original chain still in the car ??
Any second/s of louder rattle upon a cold start ??
 

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E34 M5
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Discussion Starter #5
Yes.
The chain tensioner and chain by it self with chain guides been changed at 250 000 kms.
But i will have a look again anyways, thank you for advise!

it runs just perfect after the start and when engine gets warmer this "diesel" sound appears.
I will try to make a better video.
 
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