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Lycoming Home > Support > Publications > Service Instructions
Service Instructions
From time to time, Lycoming issues Service Instructions. Service Instructions cover a variety of subjects, such as repair processes, modification procedures, inspection procedures and overhaul methods.
Service Instructions are available from Lycoming Distributors. Complete sets of Service Bulletins, Instructions and Letters are available for purchase in both hard copy and electronic form either directly from Lycoming or through a Lycoming Distributor.
SI-1543
Notification of Approved Tappet P/N 15B26262
SI-1539
Fuel Manifold Spring Change
SI-1535B
Counterweight and Roller Removal, Inspection, and Installation
SI-1534
Service Recommendations for Long-Term Storage of Engines That Use Automotive Fuel
SI-1533
Approved Fuel Pumps
SI-1531
Alternator Bracket for Kelly Starter
SI-1530
Engine Inspection in Particulate-Laden Environments
SI-1529B
Hydraulic Lifter, Tappet Body and Valve Usage
SI-1528
Aircraft Engine Starter Recommendations
SI-1526D
New Piston Part Numbers
SI-1525
Reprint of Precision Service Information Letter No. SIL RS-92
SI-1524
Alternator Bracket Kit for 130A Alternators
SI-1523A
Approved AVStar Fuel Systems Inc. Carburetors
SI-1522
Reprint of Precision Service Information Letter No. RS-62, Rev. 2
SI-1521
Reprint of Precision Service Information Letter No. RS-35, Rev. 1
SI-1520
Reprint of Precision Service Information Letter No. SIL RS-88
SI-1519A
Reprint of Precision Service Information Letter No. SIL RS-87 Revision 1
SI-1518
Reprint of Precision Service Information Letter No. SIL RS-84
SI-1517
Timing change to TIO-540-AK1A Series Engines
SI-1514B
Roller Tappets Part Information Update
SI-1513
Reprint of Lamar Service Information Letter No. LSI-009
SI-1512
Main Crankshaft and Connecting Rod Bearing Upgrade
SI-1512-S1
Main Crankshaft and Connecting Rod Bearing Part Numbers
SI-1511A
Inspection of “PID” Stamped Crankshafts
SI-1510A
Adapter Kit for Magneto Isolation Drive
SI-1509
Nuts, P/N STD-1409, Replacement of All with P/N STD-2249 Nuts
SI-1508C
Dual Magneto Attachment
SI-1506
Engines, 4-Cylinder, Replacement of Impulse Coupling Magnetos
SI-1505
Cold Weather Starting
SI-1504
Cylinder Assembly Inspection/Replacement on O-235 Engines
SI-1503
Accessory Drive Gear and Shaft Dowel Replacement
SI-1502A
Flow Divider, Inverted, Installation of
SI-1500
Change, Counterweight Roller for Robinson Helicopter
SI-1498A
Recommended Engine Procedures for Purge of Vapor During Ground Operations
SI-1497A
Engine Procedures for Flight Training Operations
SI-1492D
Piston Pin Plug Wear Inspection
SI-1489C
Fuel Manifold Spring Change
SI-1484C
Installation Torque for Fuel Metering Device, Carburetor, Fuel Injector Servo or "AN" Fuel Pump Hold Down Nuts
SI-1485A
Exhaust Valve and Guide Identification Procedure
SI-1483A
Valve Leak Check with Engive Cylinder Removed
SI-1481B
Engine Preservation, Factory
SI-1462A
Propeller Oil Control Leak Test Procedure (With Propeller Installed on Engine)
SI-1458F
Connecting Rod Bolts
SI-1457A
Optional Remote-Mounted Oil Filter Kits
SI-1454A
Rocker Arm Assembly Replacement Part
SI-1453B
Converter Plate Gasket, Oil Filter, Replacement of
SI-1442A
Improved Oil Filter Bypass Valve
SI-1443H
Approved Slick Magnetos on Lycoming Engines
SI-1438A
Governor Pad Plate, Propeller, P/N LW-12347
SI-1437
Engine Timing Marks
SI-1436A
Adapter Kit for Magneto Isolation Drive
SI-1435
Conversion Constant Speed to Fixed Pitch Prop and Vice Versa/Prop Gov Oil Line Nut and Elbow
SI-1427C
Engine Break-In and Oil Consumption Test Limits
SI-1425A
Maintenance Procedures to Reduce Possibility of Valve Sticking
SI-1424A
Installation Procedure for P/N 1526066 Hydraulic Tappet/Plunger Assemblies
SI-1420A
Fuel Pump Drive Spline Lubrication
SI-1414B
Bendix Service Bulletin No. RS-77, Rev. 2
SI-1409C
Lycoming Engines P/N LW-16702, Oil Additive
SI-1406C
Crankcase Parts for Use with Large-Diameter Hydraulic Lifters
SI-1343B
Set Screw for Propeller Governor Idler Shaft
SI-1341
Idler Shaft Lubrication, Oil Pump
SI-1340A
Pin Identification, Piston
SI-1324C
Crankshaft Oil Seals
SI-1308E
Pressurized Magneto Pressure Test
SI-1308E-1
Supplement to Pressurized Magneto Pressure Test
SI-1304J
Engine Nameplate Replacement
SI-1299B
Magneto Drive Gear and Cushion Modification
SI-1285D
Magnetic Particle Inspection
SI-1279C
Oil Sump Baffle Replacement
SI-1275C
Cleaning Fuel Injector Nozzles
SI-1267D
Piston Pin Plug Usage
SI-1257G
Horsepower, Manifold Pressure, and RPM Values
SI-1256F
Valve Guides For Service Use
SI-1246B
Engine Conversion For Use of 100/130 or 100LL Grade Fuel
SI-1241C
Engine Start, Pre-Oiling Prior to Initial
SI-1238B
Assembly and Torque Procedures for V-Band Couplings
SI-1204D
Exhaust Flange Gaskets
SI-1192A
Valve Spring Compressor No. ST266
SI-1164B
Oil Pump Application
SI-1154P
FAA Approved Starters, Generators, Alternators, Regulators and Relays
SI-1148C
Use of Carburetor Heat Control
SI-1143C
Counterweight Bushing Inspection, Replacement, and Special Tooling Upgrades
SI-1132B
Magneto Drop-Off
SI-1125D
Alternate Crankcase Parting Surface Sealants
SI-1105B
Alternator/Generator Mounting Brackets, Periodic Inspection
SI-1098H
Bushing Location, Propeller Flange
SI-1094D
Fuel Mixture Leaning Procedures
SI-1080C
Maintenance Items For Special Attention
SI-1070R
Specified Fuels
SI-1060K
Push Rod Identification
SI-1059D
Pre-Lubrication of Parts Before Assembly
SI-1042Z
Approved Spark Plugs
SI-1037N
Approved Pistons, Rings and Cylinders for Use on Lycoming Engines
SI-1014M
Lubricating Oil Recommendations
SI-1012G
Counterweights and Rollers on Engine Models
SI-1012G Supplement 1
Counterweights and Rollers on Engine Models
SI-1011J
Table of Current Tappet Bodies, Plunger Assemblies and Hydraulic Lifter Assemblies
SI-1009AU
Recommended Time Between Overhaul Periods
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