Post by
GerryO »
https://forums.nicoclub.com/gerryo-u56567.html
Sun Nov 02, 2008 7:26 pm
The inside surface of old, cracked, dirty, loose, noisy belts can become glazed, making them more prone to slipping. A slipping belt makes more of a short chirping sound, especially on a cold, wet morning start-up, when the engine is gunned or the PS is cranked far to one side or the other.
Idler pulley bearings can dry out too, and they'll squeal longer. The AC idler bearing is the most exposed one. The timing belt is toothed and it won't squeal, but it runs on two idler and one tensioner bearing. I also believe that there is such a thing as belts that are too tight (note the specs and the one member who had his WP housing break).