Supersedes Service Instruction No. 1406D September 9, 2014 MODELS AFFECTED O-320-H2AD, -H3AD; O/LO/TO/LTO-360-E1A6D TIME OF COMPLIANCE At owner’s discretion (during hydraulic lifter replacement) This Service Instruction identifies part numbers for crankcases with large-diameter hydraulic lifters.

DATE: June 5, 2014 MODELS AFFECTED Lycoming Engines’ turbocharged engine models. TIME OF COMPLIANCE During turbocharger exhaust system replacement. This Service Instruction contains basic guidelines to disassemble, assemble, and install a typical exhaust system on a Lycoming Engines’ turbocharged engine model. These instructions apply only to turbocharged exhaust systems supplied by Lycoming...

Supersedes Service Instruction No. 1141 May 9, 2014 MODELS AFFECTED All Lycoming direct drive engines TIME OF COMPLIANCE Whenever starter ring gear replacement is necessary This Service Instruction is a field procedure to replace worn or damaged starter ring gears.

DATE: May 7, 2014 MODELS AFFECTED TIO-540-J2B, -J2BD; LTIO-540-J2B, -J2BD. TIME OF COMPLIANCE Next oil change or engine inspection, whichever occurs first, no later than August 31, 2014. Evidence in the field has shown instances of chafing (Figure 1) on the turbocharger support rod (of affected Lycoming engine models). Figure 2 shows the proximity of the identification tag on an oil hose to one of...

DATE: March 21, 2014 MODELS AFFECTED Lycoming engine models in Table 1. TIME OF COMPLIANCE As required for replacement. This Service Instruction identifies new piston ring part numbers that are alternates to the existing piston ring part numbers. All of the alternate piston rings have been manufactured to be equivalent to the existing piston ring part numbers shown in Table 1. Each new piston ring...

March 19, 2013 This supplement corrects the Part Number in the following NOTE of Service Instruction No. 1454A dated February 25, 2011.

DATE: October 2, 2012 MODELS AFFECTED 320/360 series Lycoming engines with crankcase casting part number C11B20061­R Revision M or later and C11B20061­L Revision M or later. TIME OF COMPLIANCE As required. Lycoming four­cylinder 320 and 360 series engine models can have a tight fit at the nose area (Figure 1) in some airframes. There is not enough clearance between the engine and adjacent airframe...

DATE: June 27, 2012 MODELS AFFECTED Engines that have Fuel Pump Plunger P/N 61544 installed. TIME OF COMPLIANCE At next engine overhaul, whenever fuel pump plunger appears damaged, or earlier at owner’s discretion. This Service Instruction is notification that Fuel Pump Plunger P/N 23D26777 is an approved replacement for Fuel Pump Plunger P/N 61544.

Supersedes Service Instruction No. 1256E April 5, 2012 MODELS AFFECTED Intake and exhaust valve guides on all Lycoming engines except as listed below: Intake valve guides only on O-235 and O-290 series unless modified in accordance with the latest revision of Service Instruction No. 1246. TIME OF COMPLIANCE When replacing valve guides This Service Instruction identifies flanged intake and exhaust...