hey i finished rebuilding a friends 00 camrys 2.2 engine. engine was fully redone; machined and complete engine kit from rock auto. upon startup found lower end knock. after listening with a stethiscope and trying everything under the sun, decided to disassemble to inspect (oil pressure was in spec and let run for at most 2 hours-idle no driving). upon disassembly nothing found!! all bearings look new and even took to machine shop and they miked everything and everything in spec. the only thing i can tell, and i'm not sure, is that the gear on crankshaft to drive the balancer assembly has one tooth with the smallest slight chip/scuff on it. so i polished it clean and this is where i need some help. anyone run into trouble with this gear before? can not find anyone around me that even messes around with the balancer or gear. the engine was not knocking before rebuild it just had low compression on a cylinder (200k miles) so i don't see what could have happened. unless the forementioned marred tooth on gear happened during moving to or at machine shop and some how bent the gear. please help!!!