Gunny, thanks for the tips. The genset is an Onan Model 7.5HDKAJ11451H, spec H.
However, when I had the wife start it up while I was outside observing, what sounded like a bang in the coach turned out to be just the start-up shudder that I am familiar with from other generators, and the banging the result of some part of the genset carrier frame banging against something else. As I shook the front of the frame around with the genset off, I could hear the tapping, but just can't make out where it is hitting and there are no obvious marks anywhere that I could see either. I also suspect that the bang is magnified when the genset is fully retracted into the coach which is what made it alarming to start with.
So, thanks to all for the tips, since the coach has to go in to Cummins/FL for an engine brake issue, I will see what they can do about tightening up the genset frame.
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Phil Degnan
05 Vectra 40 AD
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