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Old 10-01-2010, 01:27 AM   #1
Scooby Specialist
Member#: 189845
Join Date: Sep 2008
Chapter/Region: Tri-State
Default Grr! Belts!

Hey all got a question/opinion needed. Approximately 25k miles my stock oem belts were making all kinds of sounds, such as a tapping sound when idling then while driving it was fine come to a stop I'd hear it again....i had them tightened sound was gone temporarily it came back had them replaced at 35k miles....absolutely perfect no sounds everything fine. I'm at about 50k miles now it's back the sound...the belts I put was gatorbacks(mechanic said no good). I just feel I shouldn't have to change them again so I was wondering what you guys think. I've read that maybe I need a new belt tensioner? Or that perhaps my pulleys are "glazing" my belts therefore the need to change them more often occurs. To fix that before changing belts I'm supposed to wire brush the pulleys and put some brake cleaner then replace belts and they should be fine.....can anyone verify? Or give me an idea as to why my belts keep sucking! Thanks
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Old 10-01-2010, 03:14 AM   #2
Scooby Specialist
Member#: 130489
Join Date: Oct 2006
Chapter/Region: MWSOC
Location: Superior, WI
02 WRX Wagon (WRB)
98 OBS-T, 91 Legacy SS


Gatorbacks are actually a really good belt and have been the solution to many car's problems with throwing belts. I've known garages to use nothing but Gatorbacks as they resulted in fewer come-backs in comparison to other belts.

I've used them and never had a problem. I've also used other belts...and never had a problem. Just lucky I guess.

You first need to isolate which belt is making the noise. I'd remove them both and run the engine just to make sure that it is indeed a belt and not another issue with one of the components that they drive.

It's been my experience that the most common cause of belt noise is an improperly secured AC tensioner pulley. Often times when the AC belt is tensioned, the fact that there is a nut on the front of the pully that needs a final tightening after adjustment seems to get overlooked. The quick glance sign of that is the fact that the pulley is so close to the timing cover that when the nut is left loose the pulley gets cocked a little and wears a groove in the timing cover.

Good luck, hope this helps.
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