joe_ wrote:
Generally pulleys like this are generally installed with bolts threaded so that as the engine is running, the pulley is trying to tighten the bolt as it turns (because if they were threaded the other way, they might unbolt themselves from the engine). When viewed from the front bumper, the crankshaft pulley/harmonic balancer is turning clockwise. Looking at the belt routing diagram, the tensioner pulley would be spinning to the left (counterclockwise) which would mean that it's installed with a left-hand thread bolt (i.e. opposite of the "righty tighty, lefty loosey" rule).
I think I may have thrown out my old tensioner, but I can check if it's still sitting around waiting to be taken in for scrap and see which way the bolt loosens.
I'm pretty sure you're correct, idler pulleys are clockwise unscrew and counterclockwise screw. All other pulleys for the serpentine belt tie/untie normally.