Avco Lycoming Direct Drive Aircraft Engine Overhaul Manual – O-320 O-360 O-540 Series PDF

Description

Avco Lycoming Direct Drive Aircraft Engine Overhaul Manual

This is the complete Avco Lycoming Direct Drive Aircraft Engine Overhaul Manual, Part No. 60294-7, Fifth Printing, dated December 1974 with revisions carried through June 2002. Issued by the Lycoming Division (a Textron company) and F.A.A. approved, this 152-page factory overhaul manual is the master reference for major overhaul of Lycoming’s horizontally opposed, direct drive aircraft engines. If you turn wrenches on Lycoming direct drive powerplants, this Direct Drive Aircraft Engine Overhaul Manual belongs on your bench.

File Details

• Manual type: Factory overhaul manual, Part No. 60294-7
• Brand: Avco Lycoming / Textron Lycoming
• Language: English
• Page count: 152 pages
• File format: PDF, instant download
• Edition: Fifth Printing
• Publication date: December 1974, revised through June 2002

Engine Series Covered

Rather than a single model, this Direct Drive Overhaul Manual applies broadly to Lycoming’s direct drive engine family, with model-specific limits called out throughout the text and the accompanying Service Table of Limits. Series referenced include:

• O-235 and O-235 (F, G, K, L) series
• O-290 and O-290-D2 series
• O-320, IO-320, LIO-320, AEIO-320, AIO-320 series
• O-340 series
• O-360, IO-360, LIO-360, HIO-360, LHIO-360, TO-360, AEIO-360, AIO-360, TIO-360 series
• O-435-A series
• O-540, IO-540, LTIO-540, TIO-540 series
• IO-720 series
• VO-360 and IVO-360 vertical installation series

4, 6, and 8 cylinder configurations are all addressed, with the manual noting where a procedure or limit is specific to one series rather than universal.

Chapters Covered

• Section 1 – Introduction
• Section 2 – General Description: Cylinders, Valve Operating Mechanism, Hydraulic Tappets, Crankcase, Crankshaft, Crankshaft Counterweights, Accessory Housing, Connecting Rods, Pistons, Lubrication System, Cooling System, Induction System (Carbureted and Fuel Injected), Turbocharger Controls, Ignition System
• Section 3 – General Overhaul Procedures: Cleaning, Inspection, Repair and Replacement, Reassembly, Table of Limits, Oil Seals and Gaskets
• Section 4 – Ignition System: Magnetos, Impulse Coupling, Retard Breaker, Engine Firing Order, Ignition Harnesses, Spark Plugs, Removal, Inspection, Repair, Reassembly, Installation, Timing Magneto to Engine
• Section 5 – Accessory Housing: Disassembly, Cleaning, Inspection, Repair and Replacement, Reassembly, Dual Drives, Fuel Pumps, Oil Filter, Oil Cooler Bypass Valve
• Section 6 – Cylinders, Pistons and Valve Train: Removal, Disassembly, Cleaning, Inspection, Valve Seats, Valve Guides, Cylinder Barrels (Plain Steel, Nitrided, Chrome Plated), Reassembly, Cylinder Painting, Intercylinder Baffles
• Section 7 – Crankcase, Crankshaft and Reciprocating Parts: Removal of Accessories, Disassembly, Cleaning, Inspection, Repair and Replacement, Crankshaft Oil Seal, Hydro Control Valve, Crankshaft Idler Gears, Reassembly
• Section 8 – Oil Sump and Fuel Induction: Intake Pipes, Carburetor or Fuel Injector, Induction Housing, Oil Sump, Flow Dividers, Injector Nozzles
• Section 9 – Test Procedures: Test Limits, Turbocharged Engines, Run-in Procedure and Schedule, Oil Consumption Run, Idle Speed and Mixture Adjustment, Preservation and Storage
• Section 10 – Service Table of Limits (SSP1776): Crankcase, Crankshaft, Camshaft, Cylinders, Gear Train, Gear Train Backlash, Torque and Springs, with dimensional and clearance limits keyed to individual engine models

Together, these sections walk a technician from teardown through inspection, repair, reassembly, and post-overhaul test run, with the Table of Limits providing the dimensional data needed to accept or reject every major component.

IMAGES PREVIEW

What This Overhaul Manual Covers

The Avco Lycoming Direct Drive Aircraft Engine Overhaul Manual documents disassembly and reassembly of the crankcase, crankshaft, camshaft, connecting rods, pistons, and cylinders, including the differences between parallel valve and angle valve cylinder assemblies and up-exhaust versus down-exhaust configurations. It details hydraulic tappet inspection and testing, valve seat reconditioning, cylinder barrel repair for plain steel, nitrided, and chrome plated barrels, and crankshaft bearing surface and oil seal repair. Ignition coverage runs from magneto removal and internal timing through spark plug service and full ignition wiring diagrams for both single and dual magneto installations. The accessory housing chapter covers fuel pump, oil pump, vacuum pump, and propeller governor drive assemblies, including the dual drive configurations fitted to many of these engines. Gear train diagrams show timing relationships for 4, 6, and 8 cylinder engines with both single and dual magneto housings, and the crankshaft and camshaft exploded views identify every retaining ring, gear, bushing, and dowel by part-numbered callout. Section 9 lays out the post-overhaul run-in schedule, oil consumption run, idle speed and mixture adjustment, and preservation and storage procedures for engines going back into service or into storage.

Why This Direct Drive Overhaul Manual Matters

This manual lets an owner, A&P mechanic, or overhaul shop perform a major overhaul on a Lycoming direct drive engine using the same procedures, tolerances, and inspection criteria that Lycoming itself specifies. The Service Table of Limits (SSP1776) is the difference between guessing whether a crankshaft, cylinder, or bearing bore is still airworthy and knowing it against factory minimum, maximum, and wear-limit dimensions for your specific engine model. Skipping these limits and torque values on an aircraft engine risks costly rework or an unsafe rebuild; following the Avco Lycoming Direct Drive Aircraft Engine Overhaul Manual step by step keeps a major overhaul aligned with the original F.A.A.-approved procedures. Delivery is an instant PDF download – no shipping, no waiting on a printed copy. Open it on a laptop, tablet, or phone in the hangar or shop, and print any page you need at the bench.