Rebuilt, overhauled or repaired after March 1, 1999: A “V” followed by a 3 to 5 digit number.Ĭrankshafts with these serial numbers are not affected by thisĪny Lycoming engine model specified below manufactured, For reference purposes, other Lycoming crankshaft serial numberī.

These numbersĪre not related to any Lycoming information.ģ. (numbers and/or letters) on the propeller flange O.D. Some field repair stations mark their own identification Information will be required to determine if your engine isĢ. Number, date of engine manufacture, and horsepower rating can beįound in the engine logbook or on the engine data plate. The crankshaft serial number is marked on Please note that not all “V5379”Ĭrankshafts are affected.

“V5379” followed by a 3 to 5 digit number and are The specified four and six cylinder engines.Īll affected Lycoming crankshafts have a serial number format of Therefore, Lycoming is recalling certain crankshafts in ThisĪnalysis indicates that replacement of certain crankshafts is Lycoming has continued to analyze crankshafts in service. 553 are not affected byĬOMPLIANCE: Within next 50 hours of operation or 6 monthsįrom the date of this Service Bulletin, whichever occurs NOTE: Engines that have complied with Serviceīulletin No. These crankshafts may be installed in any of

Lycoming crankshafts with a crankshaft serial number listed in Table 4 shipped as a spareĪfter March 1, 1999. Rated at any horsepower as described in Section 3 and listed Table Lycoming counterweighted (L)O-360, (L)IO-360 and AEIO-360 engines Lycoming IO-540 and AEIO-540 engines rated at 300 horsepower asĭescribed in Section 2 and listed in Table 2. Lycoming as described in Section 2 and listed in Table 2. Lycoming IO-540-P, -S, -AA engines rated at 250-290 horsepower by Horsepower or lower as described in Section 1 and listed in Table 1. Specified below manufactured, rebuilt, overhauled or repaired after MODELS AFFECTED: Any Lycoming engine model SUBJECT: Crankshaft Replacement in Lycoming Please see the referenced URLs at the end of this story for more Removal and crankshaft replacement at Lycoming's expense.Īpplicable portions of Lycoming's documents are reproduced below. Those engines involved with this SB will require Mandatory Service Bulletin that affects a number of (L)O-360,

Lycoming Engine Serial Number Lookup