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Old 05-06-2011, 02:39 PM
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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
Today, fiat84 reported anecdotal experience with changing 'just' the mechanical tensioner pulley in:
- Belts / Tensioner s/ Idler Pulley Replacement

UPDATE: Changed the AC pulley only with a Gates #38018 and a few weeks later it made an intermittent rattling grinding sound. Got loud when the engine ran for awhile so it DOES NOT appear to match factory specs. Put the old factory pulley back on which is still in great condition and no more rattling. Maybe try the Dayco #89133 since it is made by Ina. Had recently changed the AC belt a month before.
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