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Continental replaced my factory reman with exactly the same symptoms. Clue was, watch the oil pressure as the engine gets hotter and hotter. It drops close to the minimum line on the Cessna guage (but not below) and prop feathers. It took writing a letter to the president of Continental (with a copy to "the executor of my estate") to get the replacement done. Continental tore down the engine and found everything nominally within spec, but all the bearings etc were on the low side of spec, and the additive effect was to make the engine "too loose" when hot. (That last is a quote from the Continental teardown tech.) Continental replaced my engine under warranty.
Kevin
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