SUBJECT: Repair of Oil Cooler By-Pass Valve Seat
DATE: April 26, 1986
PART I: All Avco Lycoming piston engines equipped with a P/N 75944 oil cooler bypass valve.
PART II: All Avco Lycoming direct drive engines that incorporate either a dual magneto drive accessory housing or a P/N 69510 oil pressure screen and temperature valve housing on an individual magneto drive accessory housing.
TIME OF COMPLIANCE: During engine overhaul or earlier if oil leakage past the valve seat is determined to be the cause of high oil temperature.
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