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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 02-04-2013, 02:24 AM
michaux michaux is offline
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3.0D grinding/bearing noise when cold

My 2007 X5 3.0D sometimes makes a noise as if a bearing is shot. It comes from the engine bay, it lasts for a few seconds only and happens about 1 1/2 minutes after starting from cold. It only happens once and only occasionally.
Anybody know what this could be. The BMW dealer says it is nothing and they cannot find a fault.
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  #2  
Old 02-04-2013, 06:15 AM
Brian425 Brian425 is offline
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Get a mechanics stethoscope and listen to anything that spins while the motor is running. It is not uncommon for something with a failing bearing to make noise until it warms up. Check the alternator, belt tensioner, etc. It should be a very easy diagnosis.
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Old 02-04-2013, 06:44 AM
michaux michaux is offline
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Thanks for the note, but the noise only lasts a few seconds and not very often, so there is no way I can get out of the car, open the bonnet, put on my stethescope in a few seconds!
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Old 02-04-2013, 06:59 AM
jgroarke jgroarke is offline
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That's completely freaky, just stumbled on this thread in error.

I have a 2011 X3 3.0d, and noticed under load, say acceleration, I get some noise like (as you say) a bearing shot somewhere. I thought it was tranmission.

Before I go in for service tomorrow, I was just playing with it to reproduce. I can easily reproduce (which is great for show and tell ;-) by stand still revving hard and when the engine comes back down from high revs you get this loud (if you have the bonnet up) scraping noise ...
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  #5  
Old 02-04-2013, 07:23 AM
michaux michaux is offline
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My noise does not happen under load, normally near idle and only for a few seconds.
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Old 02-04-2013, 07:39 AM
jashearer jashearer is offline
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Jgroarke yours may be a waste gate releasing boost, I've noticed between shifts at high rpm, it can be fairly noticeable.

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  #7  
Old 02-04-2013, 08:18 AM
Brian425 Brian425 is offline
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Quote:
Originally Posted by michaux View Post
Thanks for the note, but the noise only lasts a few seconds and not very often, so there is no way I can get out of the car, open the bonnet, put on my stethescope in a few seconds!

Leave the truck overnight, I would expect it happens most frequently when everything is cold. Open the hood, then have another person start it up. Easy peasy. Honestly, a failed tensioner or seized alternator will leave you stuck on the side of the road. It is worth the 10 minutes total it takes to check.

I would also inspect all belts and the tensioner. It could very well be a belt that slips a bit and whines or squeels when cold.
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Old 02-04-2013, 08:30 AM
michaux michaux is offline
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Thanks for the posts. It happens at or near idle revs, so wastegate is not the issue.
It is definitely not a slipping belt noise, but could be a tensioner bearing.
If anyone has had this problem, please do advise what caused it.
Thanks
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