Service Bulletin No. 585

Incorrect Exhaust Valve Rotator Cap Shipped with Cylinder Kits P/N 05K21119, 05K21121, and 05K21122


DATE: March 17, 2009


Rebuilt, overhauled, or repaired Lycoming engines with the following cylinder kits installed:

Engine Model Cylinder Kit
O-320-H2AD 05K21119
(L)O-360-E1A6D 05K21121
(L)TO-360-E1A6D 05K21122


All Cylinder Kits P/N 05K21119, 05K21121, and 05K21122 that were shipped between November 20, 2008 and February 12, 2009.


For uninstalled cylinder kits—immediately. Engines with affected cylinder kits - at the next scheduled maintenance event, or at annual inspection, whichever occurs first.

Lycoming Engines has determined that a quantity of Cylinder Kits with the incorrect exhaust valve rotator caps may have been shipped from November 20, 2008 through February 12, 2009.


Get It Exchanged

Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.