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Finn, regarding the possibility of the apex seal
simply shattering rather than FOD. I also found in the overhaul
supplemental instructions about the parts in the basic overhaul kit this
sentence from Bruce:
".... The apex seal will rock in their grooves,
wearing the groove to a V and eventually shatter due to the excessive
clearance...."
Sooooo, I am more convinced than ever that I did
not encounter a necessarily rare condition - that excessive seal clearance and
shatter seals do happen. Does not take a foreign object. I strongly
suspect that there are probably several conditions that play a role in when the
seal shatters (if ever) and if they all play the wrong way at the same time, the
seal shatters sooner. On the otherhand, the engine might possibly wear out
before the seal shatters if those factors never converge.
Ed
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