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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 07-03-2011, 03:10 AM
ian_alex ian_alex is offline
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Location: Bedfordshire UK
 
Join Date: Apr 2008
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Mein Auto: e36 convertible
M50 engine noise

I have had a noise issue for several years and which is getting progressively worse as you might expect.
Nothing when cold but when hot at low revs under light load what I can best describe a a dull knock. Under heavy load eg a fast start it does not exist! In any event the noise goes away at higher revs.
With a stethoscope it seems to be from the timing chain area but it is not what I would regard as chain noise.
Various dealers have listened but no ideas except to disconnect Vanos which I did with no effect.
I thought about oil viscosity change with temperature perhaps related to chain tension but this is spring loaded!
What about hydraulic tappets? but location does not stack up
I intend to remove the cam cover to have a look but don't expect to see anything amiss.
There are no performance or any other issues.
Any thoughts or suggestions would be appreciated
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  #2  
Old 07-03-2011, 07:40 AM
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FenderBender FenderBender is online now
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Mein Auto: Red Sled
Does disconnecting the Vanos actually stop the parts from rotating? I don't think so.
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Old 07-03-2011, 08:44 AM
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crisscross crisscross is offline
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Mein Auto: 1995 M3 Boston Green
Nope, it will continue to rattle and make noise until the seals and bearing are replaced, plugged in or not.
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Old 07-03-2011, 02:51 PM
mksu19 mksu19 is offline
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