We just replaced the hydraulic lifters and timing chain tensioner to fix this problem. However, it didnt make a difference.
1993 M42 153,000 miles. Car sat for two years with out being started. I have changed the oil 3 times in 5'000 miles that I have driven it. The noise is getting worse the more I drive it. The engine does fine when cold, but noisy after it is ran for a few minutes, especially, after driving over 3,000 rpms(highway) for any period of time.
Listen to the video, engine cold and engine hot.
http://s417.photobucket.com/albums/pp255/carl6405/?action=view¤t=BMWEngineTapping_0001.flv
Could be the oil pump. Had the same problem w/ E 30. Installed a pressure gauge and check performance at different speeds. Pressure was consistently low against specs. Change the pump . . problem gone.
Posted on Dec 08, 2009
To anyone experiencing this noise, even to a smaller degree. Look Into getting your Timing chain replaced, along with the timing chain tensioner and timing chain guides. The M42B18 Engine always makes it known to its owner when the timing components are due for replacement, unfortunately to the tune of a Very loud engine. Though only of course because of lack of timing chain tension causing slack.
In this current situation, I'd advise having the timing components inspected and Replaced by a mechanic ASAP, as the engine sound is loud enough to warrant thoughts of possible engine failure in the very near future if not inspected.
Posted on Mar 04, 2010
I've got the same noise, and it turned out that the down stretcher on the chain was broken...sorry for my english
Posted on Dec 28, 2009
Is your problem has been solved? because I have quite the same noise (maybe a bit less) on the same car.
Posted on Aug 14, 2009
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I have the same problem. I would get some oil cleaner (detergent) and clean the engine out. Put a new filter and see what happens. Maybe a new oil pump.
same here, replaced the lifters and it still has the noise. i am stuck for ideas
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