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What I witnessed wasn't attributed to the harmonic balancer failing, said by the old mechanic. It was a dynamic fault in the design.
I don't now if Hercules ever really did any research, or maybe later Continental did.
There were at least 4 iterations of the MAN-patent engines; 427, LD-465...
Years ago, I was at the Yermo USMC base in Barstow, Ca to pick up an M37 I bought from DRMO.
I talked to a mechanic there, and the topic went to the Multifuel engine. He escorted me to a fenced acre full of hundreds of pallets, each with a multifuel with the center web blown out.
The story...