DATE: November 16, 2007
Clearance Between Oil Sump Assembly and Oil Sump Baffle.
New, rebuilt, overhauled, or repaired Lycoming IO540L1C5; TIO540 S1AD; IO580B1A series engines.
TIME OF COMPLIANCE
Whenever rivets or screws are found in the oil suction screen.
Lycoming has determined that on the above affected engines there may not be enough clearance between the oil sump assembly P/N 77517 or P/N LW14492 and the oil sump baffle P/N 56G23399 or P/N LW 13383. The oil sump baffle may rub against the oil sump assembly causing a wear groove on the inner surface of the oil sump assembly. Deformation of the oil sump baffle may further result in loosening of the rivets used to attach the oil sump baffle vertical deflectors and of the screws used to attach the oil sump baffle to the oil sump supports. If either the rivets or screws become unattached it may lead to metal contamination in the engine.
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