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  #1  
Old 08-14-2015, 11:11 PM
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Question X5 M62 Rattle when warm after timing chain replacement

Hi Guys,

I just finished replacing the timing chain, guides and tensioner on my M62 after discovering the plastic on Middle U shaped guide was completely gone.

Everything was done according to BMW's guide and I had the special alignment tools for the camshafts and the vanos and I went through the effort of cleaning every part until spotless, I even removed the lower sump pan and oil pickup to clean out all the broken plastic debris from the broken guide.

The car started fine and drives fine but once it warms up fully it makes a rattle at 2000rpm-2500rpm any higher or lower and there is no noise which is quite puzzling.

It appears that once the engine oil has heated right up and thinned out that it makes the noise.

I was wondering at what RPM does the Vanos engage? as I was thinking it might be possible that when I replaced the chain I disturbed a seal of some sort or another theory I wad was the tensioner as it looks like it is driven by oil pressure.
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Old 08-15-2015, 08:20 AM
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Did they replace the chain tensioner? That can still be done easily. See this video.

https://www.youtube.com/watch?v=UlmxeWHdFOo
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Old 08-15-2015, 10:00 AM
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The VANOS pressurized with oil within a few seconds. VANOS rattles go away very shortly after start up. I'd be worried about the oil pump and especially the oil pump sprocket. I think there is a service bulletin on how to check it. Did you do the work yourself? Did you check the tension on the small chain that drives the oil pump?
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Old 08-16-2015, 03:27 AM
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The chain tensioner was replaced, I did the work myself and the car is my father's so I am not sure if it was making any noise before the guides went.

I didn't check the pump or the pump chain but would think that if they where damaged the noise would be consistent across the rev range where this is quite specific as it only happens at 2000-2500rpm, any higher or lower and it is as normal.
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Old 08-17-2015, 12:07 AM
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I have tested the oil pressure and its 15psi at warm idle then rises to 50-70psi as I rev the engine up to around 3000rpm so I would think there is no lubrication issue.

I made a video and uploaded it to youtube here: https://www.youtube.com/watch?v=Qqlq...ature=youtu.be
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Old 08-17-2015, 10:47 PM
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Well I sorted out the problem, turned out the piston in the tensioner house was installed backwards!

I don't recall taking the new tensioner apart so I am wondering if I was unlucky and got a new one out of the box with the piston installed backwards. Good thing I did not drive car for long.

Thank you to all who contributed and I hope anyone with a similar issue finds this thread.
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