Avco Lycoming Direct Drive Engine Overhaul Manual (60294-7) – PDF

Description

Master the Complete Overhaul of Your Lycoming Direct Drive Aircraft Engine

The Avco Lycoming Direct Drive Engine Overhaul Manual (Part No. 60294-7) is the definitive factory-authorized guide for the complete disassembly, inspection, repair, and reassembly of the entire line of horizontally-opposed direct drive aircraft engines. This is the essential reference for any maintenance facility, A&P mechanic, or engine builder performing major overhauls on these powerplants. Approved by the FAA, this manual provides the exact procedures and specifications used by the factory, ensuring your engine is rebuilt to its original, airworthy standards.

Product and Document Details

• Manual Type: Official Factory Overhaul Manual
• Brand: Avco Lycoming / Textron Lycoming
• Document Part Number: 60294-7
• Edition/Printing: Fifth Printing
• Publication Date: December 1974 (with revisions through June 1999)
• Language: English
• Page Count: 152 Pages
• File Format: Scanned PDF

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Complete Coverage for All Direct Drive Models

This manual covers the full range of four, six, and eight-cylinder horizontally opposed, air-cooled direct drive engines. It includes detailed procedures that apply to most models, with specific callouts for variations like parallel-valve and angle-valve cylinder heads, and different fuel system types. This is the single source for the entire engine, from the accessory housing to the propeller flange.

Engine Models & Series Covered Include:
O-235, O-290, O-320, IO-320, LIO-320, AIO-320, O-340, O-360, IO-360, LIO-360, AIO-360, HO-360, HIO-360, TIO-360, O-540, IO-540, TIO-540, LTIO-540, O-720, IO-720, VO-360, IVO-360, and many more. The manual also covers O-435, O-540-G, and includes special coverage of both clockwise and counter-clockwise rotating engines (noted by the ‘L’ prefix).

What’s Inside: An In-Depth Section-by-Section Breakdown

The manual is organized into logical sections that follow the engine’s major components, providing a systematic approach to overhaul. Each section contains detailed step-by-step disassembly, cleaning, inspection, repair, and reassembly instructions, all backed by engineering specifications and clear illustrations.

• Section 1: Introduction – A guide to using the manual and identifying engine components. It explains the engine model code, the importance of service bulletins, and the correct orientation for viewing the engine.
• Section 2: General Description – A detailed technical overview of the engine. It explains key systems: cylinder construction, valve operating mechanism (including hydraulic tappets), crankcase, crankshaft and its counterweights, connecting rods, pistons, and the full lubrication, cooling, induction, and ignition systems. Includes detailed lubrication diagrams and gear train diagrams for all engine configurations.
• Section 3: General Overhaul Procedures – Essential instructions that apply to every part of the engine. This section covers the complete cleaning and degreasing process, safe methods for removing hard carbon, and comprehensive inspection techniques for structural and dimensional defects. It also details repair and replacement standards, pre-lubrication, and proper reassembly techniques.
• Section 4: Ignition System – A complete guide to magnetos, including impulse coupling and retard breaker types. It covers removal and disassembly of harnesses and magnetos, inspection, and detailed reassembly and timing procedures. Contains ignition wiring diagrams for 4, 6, and 8-cylinder engines.
• Section 5: Accessory Housing – Procedures for disassembling, cleaning, inspecting, and reassembling the accessory housing and all its components, such as the oil pump, oil screen, fuel pump, vacuum pump, hydraulic pump, and propeller governor drives. It details the assembly of various oil pumps and dual drive assemblies.
• Section 6: Cylinders, Pistons and Valve Train – A crucial section for the engine’s top end. This includes removal, disassembly, cleaning, and detailed inspection of cylinders (including fin repair, reaming, and honing), pistons (including ring installation and side clearance checks), valves (including seat grinding and replacement), and the entire valve train (push rods, rockers, and hydraulic tappets). It also covers cylinder painting and the installation of fin stabilizers.
• Section 7: Crankcase, Crankshaft and Reciprocating Parts – The heart of the engine overhaul. This section covers the complete teardown of the crankcase, crankshaft, and connecting rods. It includes a full breakdown of cleaning, inspection (including checks for fretting, run-out, and main bearing clearance), and repair and replacement procedures for the crankshaft, camshaft, and connecting rods. It also guides the reassembly of the crankcase halves, including a specific tightening sequence for main bearing bolts.
• Section 8: Oil Sump and Fuel Induction – Overhaul procedures for the oil sump, induction housing, intake pipes, and carburetors/fuel injectors. Includes cleaning, inspection, and repair guidelines for both float and pressure-type carburetors, as well as Bendix and Simmonds fuel injection systems.
• Section 9: Test Procedures – Vital for post-overhaul testing. This section outlines a complete run-in schedule on a test stand, detailing limits for engine speed, oil pressure, temperature, and fuel consumption. It also provides the official procedure for preserving and storing an engine after overhaul to prevent corrosion.
• Section 10: Table of Limits – The complete engineering specification sheet for the entire engine. It provides all critical dimensions, tolerances, and clearances for every major part. This includes main bearing journals, connecting rod bores, cylinder dimensions, valve guide and stem clearances, and much more. Also includes a complete torque value table for fasteners throughout the engine.

Unlock the Knowledge to Overhaul Like a Factory Pro

This manual does more than just list procedures; it provides the exact engineering data and tolerances required for a safe and reliable overhaul. You will learn to correctly assess the condition of vital parts, perform dimensional inspections, and complete the entire process from teardown to the final test run. By following the detailed, step-by-step instructions, you will rebuild your engine with the confidence of a factory technician.

Who This Manual Is For

This is an essential resource for aircraft owners, professional A&P mechanics, overhaul shops, and homebuilders working on Lycoming direct drive engines. It is the official documentation required to comply with FAA regulations for engine overhaul. Whether you are undertaking a complete overhaul for compliance, performance, or reliability, this manual provides the definitive guide.

Why You Need This Manual

Working on an aircraft engine requires precision and adherence to specific engineering standards. Using the correct procedures and torque values is not just about performance; it is about safety. The Lycoming Overhaul Manual removes the guesswork and provides the exact guidance needed to perform the job correctly, ensuring your engine is safe, reliable, and will provide thousands of hours of service. It also ensures that the overhaul is compliant with FAA regulations (FAR Part 21.50 & 43.13).

Instant Delivery & Easy Access

Your manual is available for immediate download after purchase. This PDF format allows you to view it on any device, from your shop computer to a tablet on your workbench. You can zoom in on detailed illustrations, search for specific terms, and even print specific sections for use in the shop. No shipping costs, no waiting, just instant access to this invaluable factory resource.