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Old 09-27-2012, 05:48 AM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by MoezEnt View Post
Took it to 2 mechanics and their both telling me its the timing chain tensioner or something
The "or something" is what confuses my answer below.

Was it the belt tensioner or the timing chain tensioner?

If it's the belt tensioner, these from the E39 bestlinks should help (because the E38 is essentially the same as the 540i):
- How to tell if you have mechanical or hydraulic belt tensioners (1) & how to switch from mechanical to hydraulic (1) and what is the difference between the two types (1) (2) & how to rebuild your hydraulic tensioners (1) & how to re-grease your pulleys and rollers (1) & the answer to the question of adjusting the 540i hydraulic tensioners' belt tension (1) (2)

If it's the timing chain tensioner, these from the E39 bestlinks should help:
- How to replace the timing chain tensioner and rail guide on the M62 (1) & on the M62TU (1) (2) (3)
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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