Vanos Or Timing Chain Problem? - BMW Forum -

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post #1 of 1 (permalink) Old 12-11-2004, 08:59 PM Thread Starter
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so today i changed my thermostat, coolant, and sparkplugs. when i reved the engine a little (to get the t-stat to open, so i could bleed the coolant) i started hearing a faint slapping sound. i started to up the rev's a little and the sound got a lot louder. Eventually i narrowed it town to the timing chain/ timing chain cover. when i opened the throttle, (i had my had on the cover) i was able to feel the vibrations. - not to mention the cover was friggen hot.

does anybody have any suggestions on what to change/do to combat timing chain slap?

1995 525i e34 -m50 engine
20w50 oil - just switched from 10w40

the only thing i could find is to change the tensioner. which i believe i just did about 8k miles ago.
- edit- nvm on the above statment. i believe it was the AC tensioner that i changed.

or could i be hearing a failing vanos unit?

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