I'm not certain how ours are made, but many are press-fit and some have rubber bushings for vibration damping. I haven't heard of a Montero with a spun pulley, but I wouldn't rule it out.

Odds are greater that the belt slipped a tooth on the sprockets and the crankshaft is out of sync with the valves. Did you follow the FSM procedure for installation?

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum