springer1981
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I guess but I don't think an oil spring would do that much damage to the surface. I'm not sure what they look like in one of these motors but that does look like threads. I was only guessing based on past experience with similar type of catastrophe.that actually is the mark of the spring on the oil ring, it was destroyed as well and stuck on top and one side.
originally an exhaust/escape valve broke and caused all the damages..
![blown1.jpg blown1.jpg](https://www.steelsoldiers.com/data/attachments/616/616491-6727c83e844cac60315bc434690879c6.jpg)
![blown4.jpg blown4.jpg](https://www.steelsoldiers.com/data/attachments/616/616490-f2be470526fb27e80247f4dace9b053b.jpg)