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LYCOMING ENGINES
652 Oliver Street
Williamsport, PA 17701
1-800-258-3279

KNOWLEDGE BASE

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Service Bulletins | 02.10.23
Service Bulletin No. 649

INSTALLATION OF CORRECT ELECTRONIC IGNITION SYSTEM (EIS)

Service Instructions | 02.10.23
Service Instruction No. 1443 S

APPROVED SLICK MAGNETOS AND LYCOMING ELECTRONIC IGNITION SYSTEM (EIS) ON LYCOMING ENGINES

Service Bulletins | 02.10.23
Service Bulletin No. 628 A

REPRINT OF HARTZELL ENGINE TECHNOLOGIES’ (HET) ALERT SERVICE BULLETIN (ASB) 076

Service Bulletins | 02.10.23
Service Bulletin No. 651

INSPECTION FOR ROTATOR CAPS ON INTAKE VALVES

Service Instructions | 05.20.22
Service Instruction No. 1583

Front Expansion Plug Replacement

Service Bulletins | 04.22.22
Service Bulletin No. 646 A

T-Bolt Clamp Inspection

Service Instructions | 04.08.22
Service Instruction No. 1533 E

Approved Rotary Vane Fuel Pumps

Service Letters | 03.02.22
Service Letter No. L 289

Valve Spring Part Numbers

Service Instructions | 02.03.22
Service Instruction No. 1587

Reprint of AVStar Service Information Letter No. AFS-SIL-03

Service Instructions | 12.21.21
Service Instruction No. 1586

Oil Filter Base Bypass Spring Replacement

Service Letters | 12.17.21
Service Letter No. L 288

Alternate Bolt Locking of Wastegate Solenoid Valve

Service Bulletins | 12.15.21
Service Bulletin No. 647

Incorrect Markings on Service Tool# ST-310

Service Instructions | 11.22.21
Service Instruction No. 1582 A

Fuel Injector Replacement

Service Instructions | 11.22.21
Service Instruction No. 1573 E

Lycoming TEO-540 Engine Series Approved Engine Configurations

Installation & Operator Manuals | 11.19.21
TEO-540-C1A Engine Installation & Operations Manual

DOCUMENT PART NO. IOM-TEO-540-C1A REV 4

Maintenance Manuals | 11.19.21
TEO-540-C1A Engine Maintenance Manual Rev 4

DOCUMENT PART NO. MM-TEO-540-C1A REV 4

Service Instructions | 11.19.21
Service Instruction No. 1585

Oil Cooler Bypass Valve Assembly Replacement

Service Bulletins | 09.24.21
Service Bulletin No. 645

Small End Connecting Rod Bushing Inspection

Service Bulletins | 09.16.21
Service Bulletin No. 643

Crankcase Nut Safety Wire Inspection

Service Letters | 08.27.21
Service Letter No. L 285

Change in cylinder configuration for O-235-C, -E, and -H Series engines

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Lycoming Engines is an Operating Division of Avco Corporation. ©2025 Avco Corporation.

LYCOMING ENGINES
652 Oliver Street
Williamsport, PA 17701
1-800-258-3279