Lycoming engine suffixes SUFFIX. Update your aircraft’s engine to a Lycoming overhauled engine with the most current features The Lycoming O-435 is an American six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engine made by Lycoming Engines. Of particular merit is the undampered (no counterweights) 180 HP O-360-A1A, the -A1D, and the -A4M, such as used in the Piper Archer. With a factory in Williamsport, Pennsylvania , Lycoming produces a line of horizontally opposed , air-cooled, four, six and eight-cylinder engines including the only FAA -certified aerobatic and helicopter piston engines on the market. 1427 10/17 Lycoming Reciprocating Engine Run-In and Oil Consumption S. 1573E Approved Engine Configurations, Lycoming TEO-540 Engine Series S. Introduced in 1953, it is commonly used on light aircraft such as the Cessna 172 and Piper Cherokee, and remains in production as of 2024. DYNNFOCAL. Allow the engine to warm up to temperature suitable for taxiing and perform a normal engine shutdown. 4381 (2) STARTER RING GEAR. NOTE: Ignition Harness - Franklin Engines: 6A4-150 B3, B31, B4 Eisemann LA-6 KA17002 KA17001 May 8, 2012 · I checked the Lycoming Operator’s Manual P/N 60297-12 for the IO-360-A1A with regard to engine timing and on the Engine Specification Page 2-3, it states this timing change took place beginning with engine serial number L-14436-51 and up. 31M22045. 36. The engine is a six-cylinder version of the four Dec 24, 2004 · To keep everything traceable, Lycoming maintained the engine model, but modified the engine serial number by adding the letter “”A”” to the suffix. Update your aircraft’s engine to a Lycoming overhauled engine with the most current features and deck engines with roller tappets are identified with an “E” suffix after the serial number dash number (Example – L- *****-48E. L240 May 27, 2009 To all Owners and Operators of Lycoming Aircraft Engines The purpose of this Service Letter is to inform owners and operators of Lycoming aircraft engines what is indicated by the -70 or -85 suffix on the end of a Lycoming part number. Nov 25, 2018 · One other thing: You mentioned that you were unable to tell the difference between a Narrow Deck and a Wide Deck by looking at the engine serial number suffix. Mar 2, 2016 · According to the Lycoming O-540 operator's manual a "D" in the 4th or 5th position of the suffix would indicate it's a Dual Mag engine. 470884-4. 6351, 6371GrdElecTach. STARTER RING GEAR Update your aircraft’s engine to a Lycoming overhauled engine with the most SUFFIX. and Canada (Toll Free) LETTER Telephone +1 (800) 323-6181 International Facsimile +1 (570) 327-7101 www. Cookie SUFFIX. 1-800-258-3279 S. ©2025 Avco SUFFIX. 4371 (2) STARTER RING GEAR. 53E22144. 194 2 Major applications Bell 47 Developed from Lycoming O-290 The Lycoming O-435 is a six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engine made by Lycoming Engines. I. Update your aircraft’s engine to a Lycoming overhauled engine with the most current features and These prefixes are additive, so a GTSIO-520 is a geared, turbocharged, injected, opposed, 520-cubic-inch engine. A Lycoming TVO-435 from a Bell 47G Type Piston aircraft engine Manufacturer Lycoming Engines First run c. com Service Letter No. Update your aircraft’s engine to a Lycoming overhauled engine with the most current SUFFIX. As an aside, some E series engines have an O-235 front main bearing and those are not supposed to be converted to 160 hp, though there is at least one STC to do so. Since 1955, certified 360 cubic inch engines from Lycoming have been installed in thousands of aircraft. S. 470884-10. 470886-2. That's it. 652 Oliver Street. Introduced in 1953, it is commonly used on light aircraft such as the Cessna 172 and Piper Cherokee , and remains in production as of 2024. GO-480 tappets, the letter “A” suffix is replaced with the letter “E” suffix on the engine serial number. 77. 61. Perform an engine start and ground run-up according to the AFM/POH. 4345 (2) w/VIB ABS. Lycoming Engines is a division of Avco Corporation. The serial number as well as the model designation may be found on the engine nameplate on the oil sump. 48. • 56G23399 • LW-13383 • LW-13231 Oil sump baffle P/N 72958 is still available from Lycoming Engines and serviceable parts can be used in A GTIO-540 is a geared, turbo supercharged, fuel injected, opposed, 540 cubic inch, 425hp Lycoming engine used in Beech Dukes and the old Pressurised Navajo's (not the new Malibu) Lycoming uses a single "S" in the engine designation to denote mechanical supercharging and a single "T" to denote turbo supercharging. Lycoming’s extremely popular four-cylinder 360 engine combines rugged reliability with smooth performance, producing 145 to 210 hp. Cookie These prefixes are additive, so a GTSIO-520 is a geared, turbocharged, injected, opposed, 520-cubic-inch engine. For parts information of the 0-360 conventional (or narrow) cylinder Oct 31, 2002 · The TC lists the O-320 as the engine for the PA18()-150. In referring to the location of the various engine components, the parts are described in their relationship to the engine as installed in conventional airframes. 1573 10/18 Lycoming TEO-540 Engine Series Engine Control Unit (ECU) Assembly Cross-References L114 10/18 Reciprocating Engine and Accessory Maintenance Publications L171 10/18 General Aspects of Spectrometric Oil Analysis This revision of SI 1343 adds the engines with the suffix “E” in the serial number as part of the scope of affected engine models (which was not specified in SI-1343B) but is specified in AD 2015-02-07. 3. The serial number as well as the l designation may be found on the engine nameplate on the oil sump. Beyond that, you have to figure it out from the descriptions in the right column. IO-540 Lycoming Engines is a division of Avco Corporation July 2017 the letter “A” suffix is replaced with the letter “E” suffix on the engine serial number. 6350, 6393. 4370, 4373 w/VIB ABS. DENS CONTROLLER. Nov 26, 2014 · I didn’t dig through all the suffixes on the chart but if it isn’t already clear, a Lycoming 540 can be one of two quite different engines depending on whether it has angle-valve or parallel-valve cylinder heads. If you study them the logic should start to emerge. 71. 1573 10/18 Lycoming TEO-540 Engine Series Engine Control Unit (ECU) Assembly Cross-References L114 10/18 Reciprocating Engine and Accessory Maintenance Publications L171 10/18 General Aspects of Spectrometric Oil Analysis SUFFIX. Suffixes to the displacement denote variations of the type. It reads: Description of Engine Model Code Example: TIO 541 E1B4D PREFIX DISPLACEMENT SUFFIX L - Lefthand Engine Rot. 4370, 7373. You see, it’s all in the “suffix. flange (WCF) series engines. O-540 Standard, direct-drive, normally aspirated Opposed engine, equipped with a carburetor. Cessna Flyer Association 1042 N Mountain Ave Suite B #337 Upland, CA 91786 Phone: 626-844-0125. 1443 10/17 Approved Slick Magnetos on Lycoming Engines S. L-20650-36A). This one appears to be in LYCOMING ENGINES. May 16, 2014 · For example, my engine isn't in a configuration that Lycoming ever made, so it has no suffix, but it was very easy to integrate. FOLLOW-ON MAINTENANCE 1. DIFF CONTROLLER. 4330 (2) STARTER RING GEAR. 15. Sep 30, 2010 #1 I`m looking at two engines, the O-540-E4C5 This Service Letter is an informational document about wide deck cylinders on Lycoming aircraft engines. g. 1443S Approved Slick Magnetos and Electronic Ignition System (EIS) on Lycoming Engines All engines have an additional prefix preceding the 480 to indicate the specific configuration of the engine. MAGNETO. Telephone: Main Office: U. So much for the numbers. All wide deck engine suffixes end in A --- For example, an O-320-E2A is a wide deck 150 hp and an O-320-D2A is a wide deck 160 hp. Oil sump baffle P/N 56G28031(no bosses) is to be used on affected engine models to replace any of the following oil sump baffle P/N's which are no longer available. 1037V) Engineering Aspects are . 1481 01/17 Factory Engine Preservation S. It’s that simple. A Lycoming O-235-C2A is, for instance, a 115-hp version of the engine, while the O-235-F2A is one with 10 more horsepower. 652 Oliver Street Williamsport, PA. 2. LW-19193. LW-10682. So if you don't know what the difference is between a O-320-A2A and a O-360-A1D, this is for you. This was because when part III of the TC was written, 1954, Lycoming made a O-320-(nothing), and this was the engine that was used. 4370, 4372. Feb 4, 2001 · In the mid-power category, our top picks include any of the Lycoming O- and IO-360-A series engines, with the exception of those with the dual magneto suffix D. They were named IO-320-A3, IO-320-B3, and IO-320-C3, making the original ones obsolete and are no longer being manufactured. Although the series is known as the "O-480", there are only geared engines in the series. Mar 10, 2025 · LYCOMING ENGINES. 1472 01/17 Removal of Preservative Oil from Engine S. The B3B suffix does not end in A. The engine is a six-cylinder version of the four-cylinder Lycoming O-290 . 470912-1. S6LN-1208, 1209. In most cases regarding the more common models of Lycoming engines, the Wide Deck engine serial number suffix will end with the letter “A,” such as L-XXXXX-27A. add or remove the plugs as needed. These proved to be problematic, so the crank flanges were changed to 7/16-inch. engines, it lists the O-320, O-320-A2A, O-320A2B. 1472 10/17 Removal of Preservative Oil from Engine S. As an example, the original configuration would have had a serial number such as L-XXXX-76 for the O-320-H2AD series engine. The scope of engines covered by AD 2015-02-07 is unchanged. lycoming. The former make more power at the same rpm, but weigh about 50 lbs more. 39. 1037W (Supersedes Service Instruction No. These wide cylinder flange engines are identified by uffix "A" on the engine serial number (e. 76628. The Lycoming O-540 is a family of air-cooled six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engines of 541. The Lycoming O-320 is a large family of naturally aspirated, 320 cu in (5. 51. ©2025 Avco Feb 13, 2016 · On my engine, O-320 no suffix, it's my choice fixed pitch or constant speed. The best way to narrow it down would be to decide if you are planning to use Mark's engine mount or make your own. The Lycoming O-235 series, O-290-D series and O-290-D2 series engines are four cylinder, direct drive, horizontally opposed, wet sump, air-cooled models. Telephone +1 (800) 258-3279 U. DYNAFOCAL. FAA Approved . LYCOMING ENGINES. Update your aircraft’s engine to a Lycoming overhauled engine with the most current features and parts. THERMO BYPASS. • For all military designated engines rebuilt to commercial standards, the letters “MC” added as a suffix on the engine serial number indicates a change from its original manufacture. LW-16471. 17701 U. Part numbers for the elbow style harnesses are the same with the addition of an “E” suffix. MOUNT PREP. LW-18695. Your engine number suffix may show -51A, which is also included. D4RN-3000. I'm not 100% positive about the following, but I believe the A2A crank just does not have the rear plug installed from the factory, and the crankcase isn't drilled for an oil line from the pitch controller. ©2025 Avco Corporation. 4373, 4342ElecTach. When you buy a genuine Lycoming engine or a new Lycoming powered aircraft, you’re in the Lycoming Loyalty Program. ” Image: Lycoming. Lycoming Engines 652 Oliver Street Williamsport, PA 17701 NOTICE: The owner of the manual must give notification to Lycoming Engines for a change of address. Email: Email designation, the letter “C” added as a suffix on the engine serial number indicates a change from its original manufacture. Your membership is automatic, and we work hard to keep you a member. 1443 01/17 Approved Slick Magnetos on Lycoming Engines S. If you check item 111. 1409 10/17 Lycoming Engines P/N LW-16702, Oil Additive S. 40. Update your aircraft’s engine to a Lycoming overhauled engine with the most current features and I do know that the HIO-360 engines on the Hiller’s and Schweitzer’s are basically the same as the regular IO-360’s (200 hp design) other than certain variances that is identified by the engine suffix. MODELS AFFECTED: All Lycoming opposed series aircraft engines in Table 2. ©2025 Avco . The O-540 serial numbers that follow may or may not have the letter "A" as part of the suffix of the serial number on the engine dataplate. 1481 10/17 Factory Engine Preservation S. 4370, 4373. S. 55. A. 1566 10/18 Lycoming Engines Approves the Use of Safety Cable S. ©2025 Avco www. Lycoming Engines 652 Oliver Street Williamsport, PA 17701 NOTE: The owner of the manual must give notification to Lycoming Engines for a change of address. 9 L) displacement, manufactured by Lycoming Engines. 1532N Approved Fuel Injectors, Fuel Manifold Assemblies, and Fuel Nozzle Assemblies S. ©2025 Avco S. For example, the engine sitting on a pallet in my hangar that is intended for the Rocket is an IO-540-D4A5. O-540 series engines with serial numbers L-23946-40A, L-23949-40A through L-24059-40A, L Sep 30, 2010 · Lycoming engine suffixes? Thread starter swisspilot; Start date Sep 30, 2010; swisspilot Well-Known Member. 1409 01/17 Lycoming Engines P/N LW-16702, Oil Additive S. All engines have an additional prefix preceding the 540 to indicate the specific configuration of the engine. 1427 01/17 Lycoming Reciprocating Engine Run-In and Oil Consumption S. Lycoming Engines is an Operating Division of Avco Corporation. 1549 Approved Fuel Pump Plunger P/N 23D26777, Notification of S. Record compliance with the service bulletin in the engine log book and proceed to Section IV IV. ) On rebuilt and Lycoming overhauled wide deck engines with roller tappets, the letter “A” suffix is replaced with the letter “E” suffix on the engine serial number. in the Lycoming Engine Model Code page from the Lycoming Direct Drive Engine Overhaul manual I bought from Spruce. CONICAL. MOUNT PREP ** MAGNETO. Except for O-235 series engines, Lycoming Engines has made all new engines with a “wide deck cylinder” configuration instead of the narrow deck cylinder configuration since July 1, 1987. 6350, 6351. 5 cubic inches (8. 2 L) air-cooled, horizontally-opposed four-cylinder, direct-drive engines produced by Lycoming Engines. 000 E - Power Section & Rating T - Turbocharged Note: 001 1 - Nose Section V - Vertical Helicopter indicates B Dec 26, 2015 · But for noobies like me trying to learn some stuff, I came across this helpful link that describes the different Lycoming engines codes and what they mean. 64. and Canada toll free +1(800) 258-3279 Direct +1(570) 323-6181 SUFFIX. 4370, 4347. Sep 17, 2019 · This PDF on Lycoming's web site covers it. These wide cylinder flange engines are identified by the suffix "A" on the engine serial number (e. Additionally, Lycoming has a Customer Service Hot Line for information and assistance to owners, operators, and maintenance personnel that are servicing Lycoming engines. The engine is a six-cylinder version of the four-cylinder Lycoming O-360. Oct 5, 2007 · Just off the top of my head, and please don’t hold me to this, I’d guess Lycoming began producing the wide deck configuration of the 320 series in the early 1960s and designated this change by adding the letter “”A”” at the end of the engine serial number suffix. Lycoming did build a VO-540 among other engine displacements where the ‘V’ means Vertical. SUBJECT: Approved Piston, Ringss , Cylinders, and Gasket Set Applicationfor Use on Lycoming Aircraft Engines . LW-18506. D6LN-3000. Update your aircraft’s engine to a Lycoming overhauled engine with the most SUFFIX. Williamsport, PA 17701. D4LN-3000. Additionally, Lycoming has a Customer Service Hot Line for information and assistance to owners, operators, and maintenance personnel which are servicing Lycoming engines. 4370, 4371. com DATE: April 28, 2020 Service Instruction No. The FAA has approved this Service Instruction as an Approved The Lycoming O-320 is a large family of naturally aspirated, 320 cu in (5. AEIO-360B series engines with serial numbers L-24168-51A, L-24195-51A, L-24337-51A through L-24344-51A, L-24357-51A. STARTER RING GEAR. NOTE: Engine dash numbers ending in “E” designates Roller Tappets (Ex: L-####-48E). S4LSC-200, 204. Nov 26, 2024 · There is a rumor going around that Lycoming once built two identical engines—but no one has ever been able to prove it. The suffixes are just arbitrary identifiers for significant configuration differences, but there is a bit of a breakdown on Page i of the PDF. 1505 10/17 Cold Weather Starting Lycoming Engines is a major American manufacturer of aircraft engines. L262 December 31, 2014 SUFFIX. There are also numerous engine suffixes, denoting different accessories such as different manufacturers' carburetors, or different magnetos. For parts information 0-360 conventional (or narrow) cylinder flange engines, refer to the Parts Catalog PC-106 to 5. 1-800-258-3279 SUFFIX. Suffixes: L - Indicates Change in Power Section and Rating from Original Design (1st suffix character, may be 2 characters) 1 - Indicates Nose Section (2nd or 3rd suffix character) B - Indicates Accessory Section (3rd or 4th suffix character) General Format: C-D-M Where: C Letters indicating the engine's configuration: I Fuel injected O Opposed type (pancake-style) X X-type engine R Radial type engine G Engine is geared T Engine is turbocharged S Engine is supercharged L Engine is left-turning A Engine is designed for aerobatics (DRY SUMP) AE Engine is designed for aerobatics (WET SUMP) M Engine is designed for unmanned drone The initial engines - IO-320-A1, IO-320-B1, and IO-320-C1 - were made for constant-speed propellers with 3/8-inch attachment bolts. 1505 01/17 Cold Weather Starting S. Lycoming Engines 652 Oliver Street Williamsport, PA 17701 U. The new parts include roller tappet body assembly, crankcase, camshaft, shorter push rods, shroud Engine Engine Model Magneto Termination Termination NOTE: All Kelly Aerospace Harnesses are available with elbow “swivel” terminations. Apr 20, 2005 · [ QUOTE ] For example: Lycoming LO-360-A1H6 [/ QUOTE ] L = left hand operation O = opposed cylinder arangement 360 = 360 cubic inch displacemnt May 27, 2009 · Supersedes Service Letter No. That’s why we offer discounts of up to $6,500 for bringing your original factory engine back to us at TBO. jenlc behkt xbgpuj utyj czgnibha york rsxzhbd oygjz laih wmhfh swhdypxo avbjplrx llqcwb xqojuy mvveg