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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-1531
Alternator Bracket for Kelly Starter
SI-1529A
Hydraulic Lifter, Tappet Body and Valve Usage
SI-1528
Aircraft Engine Starter Recommendations
SI-1526
New Pistons
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-1514A
Introduction of Roller Tappets
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-1510A
Adapter Kit for Magneto Isolation Drive
SI-1509
Nuts, P/N STD-1409, Replacement of All with P/N STD-2249 Nuts
SI-1508B
Attachment, Magneto
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-1492D
Piston Pin Plug Wear Inspection
SI-1489B
Fuel Manifold Spring Change
SI-1484A
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-1481B
Engine Preservation, Factory
SI-1462A
Propeller Oil Control Leak Test Procedure (With Propeller Installed on Engine)
SI-1458E
Connecting Rod Bolts
SI-1453A
Converter Plate Gasket, Oil Filter, Replacement of
SI-1443G
Approved Slick Magnetos on Lycoming Engines
SI-1438A
Governor Pad Plate, Propeller, P/N LW-12347
SI-1437
Engine Timing Marks
SI-1435
Conversion Constant Speed to Fixed Pitch Prop and Vice Versa/Prop Gov Oil Line Nut and Elbow
SI-1427B
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-1409C
Lycoming Engines P/N LW-16702, Oil Additive
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-1285C
Magnetic Particle Inspection
SI-1275C
Cleaning Fuel Injector Nozzles
SI-1267D
Piston Pin Plug Usage
SI-1257G
Horsepower, Manifold Pressure, and RPM Values
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-1164B
Oil Pump Application
SI-1154M
Alternators, FAA Approved
SI-1148C
Use of Carburetor Heat Control
SI-1143B-S4
Supplement No. 4 to Service Instruction No. 1143B
SI-1132B
Magneto Drop-Off
SI-1143B-S4
Alternate Crankcase Parting Surface Sealants
SI-1105B
Alternator/Generator Mounting Brackets, Periodic Inspection
SI-1098G
Bushing Location, Propeller Flange
SI-1094D
Fuel Mixture Leaning Procedures
SI-1080C
Maintenance Items For Special Attention
SI-1070Q
Specified Fuels
SI-1060K
Push Rod Identification
SI-1042Z
Approved Spark Plugs
SI-1037N
Approved Pistons, Rings and Cylinders for Use on Lycoming Engines
SI-1014M
Lubricating Oil Recommendations
SI-1012F-S2
Supplement No. 2 to Service Instruction No. 1012F
SI-1009AU
Recommended Time Between Overhaul Periods
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