Looking at a 12A Engine to replace our rapping/knocking current engine. Am looking at one that was in a car that was rolled and ended upside down. What can I check/look at to make sure the engine is ok. I suspect the Rotary probably is pretty rugged but what should I check? Pull pan? At best any used engine can have problems as could any rebuilt engine. Thanks for any advice/help. Tom Weaver Truck Driver ailing ITA #63