As an engine manufacturer, we are often asked to guide pilots and mechanics concerning what to do about an engine after sudden stoppage, or a ground strike by the propeller. Lycoming Service Bulletin No. 475C states Lycoming’s position concerning this problem. These important publications point out that there may be hidden internal engine damage from such an incident. From the experience of...

Many starters manufactured by Prestolite and Electro Systems are in use with Lycoming engines. From time to time, these starters used on our direct-drive engines are returned to the factory reported as malfunctioning, but investigation here revealed the problem to be dirt. The location of the starting motor on many aircraft engines subjects the Bendix Drive of the starter to contamination from...

What is Engine Balancing? explains that certain engine parts are organized in matched sets, by weight, before they are installed in an engine being built at the Lycoming factory. Occasionally, it may be necessary to replace one of these parts during the operational life of the engine. When this happens, mechanics in the field should know that Lycoming parts which are matched by weight when an...

Perhaps the first step in discussing this subject is to first get the terminology correct. The latest revision of Lycoming Service Instruction No. 1324 calls it a crankshaft oil seal. Although almost everyone knows exactly what you are talking about when the term nose seal is used, correct terminology can be important. Should this seal leak immediately after installation, it is possible that the...

DATE: April 5, 2016 MODELS AFFECTED IO-360-M Series Engines TIME OF COMPLIANCE At the next oil change This Service Bulletin is notification to replace the oil level gage (dipstick) P/N LW-16783-18 with a new oil level gage P/N LW-14760 on affected Lycoming engine models. This replacement is mandatory and must be done at the next oil change.

February 3, 2016 MODELS AFFECTED All Lycoming engines equipped with Alternator Part Number LW-14326 or LW-14338. TIME OF COMPLIANCE 50 hours from the issue date of this Service Bulletin or the next regularly scheduled maintenance event (whichever occurs first.) This Service Bulletin is notification of required action for mandatory compliance with Hartzell Engine Technologies Service Bulletin SB...

DATE: February 2, 2016 MODELS AFFECTED Lycoming engine models IO-360-A1B6, IO-360-C1G6, TIO-360-C1A6D, IO- 540-K1G5, TIO-540-AH1A, and AEIO-580-B1A that have alternator assembly part number (P/N) 32C21703 or 32C22492 and any spare alternator assemblies P/N 32C21703 or 32C22492. TIME OF COMPLIANCE At the next regularly scheduled maintenance event but not later than 12 months after the effective...

October 30, 2015 MODELS AFFECTED All O-360-A4A and -A4J series engines with serial number up to and including L-23659-36A, IO-360-B4A series engines with serial number up to and including L-17977-51A (not installed on Piper PA28-181 (Archer III) aircraft) and rebuilt engines shipped prior to August 17, 1977 are subject to this modification. Also, any O-360 model converted to O-360-A4A or -A4J must...

July 6, 2015 MODELS AFFECTED Lycoming Engine Models: IO-540-AC1A5, (L)TIO-540-V2AD, TIO-540- AJ1A, TIO-540-W2A, TO-360-C1A6D, TIO-360-C1A6D, TIO-541-E Series, TIGO-541-E1A, and IO-580-A1A Applies to: Engines with the serial numbers identified in Table 3 Cylinder kits identified in Table 2 shipped from the factory between March 2, 2009 and August 17, 2011 Intake valves (P/N 17A23942) sold as spares...