Pulled the plugs to check for spark and discovered no compression in one cylinder. No knocking or banging when turning the engine over. Does have spark and finally started but is only running on one cylinder I am sure. Why no noise? I have had other engines break a rod but always hammered. Would a valve cause complete loss of compression? Do these Onans have compression releases? The bad cylinder is closest to the steering wheel and I assume this means I will have to pull the engine to even get the head off to start looking. Anyone have this happen to them or any suggestions on what to do or look for next. Winter is fast coming and this was to be my plow tractor. :crybaby: Any help is really appreciated.