on August 5, 2011, 12:51 am, in reply to "Re: Audi A4 2.0TDi 140 BLB - Rough idle, code P16686 #"
Well the easyiest way from a belt to jump with-out damage to the belt is if it turns counter-clockwise ie not the normal direction (it unload,s the tensioner, Honda,s visa-versa.
But those pistons look to different to believed (or is photo not correct)
Kev.