We just lost another here too.
My tech just informed me that this is actually the 4th failure (out of 7 PSI engines) we had. They caught the other two last week while doing PMs.
Wondering if it's a design or material issue. By their description, this cooling port is really close to the exhaust port, so it's getting cooked.
Wouldn't be the first time we had O-ring issues on a Yale. Couple years back, a bunch of them were having o-ring failures on the charge pumps. After a few thousand hours, the o-rings were rock hard. Upgraded them to Viton and the problems went away. Not sure if Viton would hold up here.
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