Serpentine belt tensioner with exposed coil spring and idler pul…

Extreme close-up of a serpentine belt tensioner installed on an engine, showing the cast aluminum body, exposed coil spring and the black tensioner arm with its square drive hole for a breaker bar. A smooth idler pulley with a ribbed accessory pulley sits to the right against the cast alloy front cover.

AI caption March 2006 · Photo 27 of 337