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Old 08-31-2015
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Jason @ 281m Jason @ 281m is offline
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Join Date: Mar 2010
Location: Fullerton, California
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Quote:
Originally Posted by jrcalvin View Post
I have about 13,000 on my 2007 PJ. Whether, the pulley is plastic, aluminum billet or steel, it still comes down to the longevity/quality of the sealed pulley bearing. My SC motor rarely sees anything over 6,000 rpm. I just chalked it up to an earlier than usual bearing failure.

I am not going replace all the pulleys as preventative maintenance at this time. Actually, I had all the tools and spare serpentine belt in my PJ to fix the serpentine belt problem when it occurred but did not have a spare pulley.
Hey John, your right it does matter about the quality of the bearing. We recommend Timken whenever/wherever possible. However, the balance of the pulley has A LOT to do with the bearing lifespan. If the pulley isnt balanced precisely, the bearing will prematurely fail. This is why we strive to get people to ditch the plastic (horrible) and steel pulleys. The billet ones are balanced and to date, we've never replaced a bearing on a billet pulley. Lastly, the entire serpentine pulley system has to be in good shape. Anything providing an imbalance will cause everything else to fail including the noise drive assembly bearings in the snout of the supercharger.

Hope that helps.
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