Avco Lycoming 76 Series Engine Overhaul Manual – O-320, O-360, IO-540, TIO-540 PDF (Revised June 1996)

Description

Avco Lycoming 76 Series Engine Overhaul Manual

This is the complete Avco Lycoming 76 Series Engine Overhaul Manual, Part No. 60294-9, originally issued by the Avco Lycoming Williamsport Division of Avco Corporation and revised June 1996. The Avco Lycoming 76 Series Engine Overhaul Manual is the factory-format overhaul reference for the entire family of Lycoming direct drive, integral accessory drive, geared, and vertical drive horizontally opposed aircraft piston engines, and it is approved by the F.A.A. as an overhaul and maintenance reference.

File Details

• Manual type: Aircraft engine overhaul manual
• Brand: Avco Lycoming (Textron Lycoming) 76 Series engines
• Publication number: 60294-9
• Revision: 60294-9-2, with prior revisions February 1992 and June 1996 (current)
• Original issue: Second Printing, August 1980
• Language: English
• Page count: 230 pages
• File format: PDF, instant download

Engine Models Covered

The Avco Lycoming 76 Series Engine Overhaul Manual applies across four organized engine groups, each with its own model chart in the Table of Limits section: direct drive engines including the O-235, O-290, O-320, O-340, O-360, IO-360, LIO-360, AIO-360, HIO-360, and TO-360; integral accessory drive engines including the TIGO-541 and TIGO-541 variants; geared engines including the IGO-480, IGSO-480, and IGO-540/IO-540 gear-driven derivatives; and vertical drive engines including the VO-435, TVO-435, IVO-435, VO-540, IVO-540, TVO-540, and TIVO-540. Direct drive high-performance variants such as the IO-540, AEIO-540, TIO-540, LTIO-540, and IO-720 are also fully addressed. Because the manual is organized by lettered model charts rather than a single airframe, the portions of the text applying to any one particular engine model are clearly identified throughout, so an owner of any 76 Series-family Lycoming engine can isolate the exact specifications and limits that apply to their unit.

Chapters Covered

• Section 1 – Introduction: manual scope, tool and parts catalog references, service bulletin and instruction policy
• Section 2 – General Description: cylinders, valve operating mechanism, crankcase, crankshaft counterweights, connecting rods, pistons, lubrication system, cooling system, induction system, ignition system
• Section 3 – General Overhaul Procedures: cleaning and degreasing, hard carbon removal, inspection (bearing surfaces, gears, corrosion, screwed fittings, magnetic inspection), repair and replacement of damaged and painted parts, stud replacement, reassembly and corrosion prevention, oilite bearings, table of limits reference, oil seals and gaskets
• Section 4 – Ignition System: dual magneto, engine firing order, ignition harness and spark plugs, removal, disassembly, inspection, repair, reassembly, and magneto-to-engine timing
• Section 5 – Cylinders, Pistons and Valve Train: removal, disassembly, cleaning, cylinder and piston inspection, valve rocker, push rod, valve, hydraulic lifter and valve spring inspection, spark plug insert and valve seat repair, valve refacing and guide work, nitrided and chrome plated cylinder barrel handling, piston and cylinder reassembly, intercylinder baffles
• Section 6 – Oil Sump and Fuel Induction: intake pipe, carburetor, oil suction screen and oil sump disassembly, cleaning, inspection, carburetor repair, reassembly
• Section 7 – Crankcase, Crankshaft and Reciprocating Parts: oil and vacuum pump, starter ring gear support, tachometer and governor drive removal, crankcase, camshaft, crankshaft and counterweight disassembly, dimensional and visual inspection, crankshaft bearing surface and propeller flange repair, connecting rod bushing and starter ring gear replacement, full reassembly through the oil seal and drive belt installation
• Section 8 – Test Procedure: test limits, run-in procedure and schedule, oil consumption run, idle speed and mixture adjustment, engine and carburetor preservation and storage
• Section 9 – Table of Limits: the complete SSP-1776 Service Table of Limits and Torque Value Recommendations in four parts covering crankcase/crankshaft/camshaft data, cylinder data, gear train data, gear train backlash, and torque and spring specifications for every model chart

Taken as a whole, the Avco Lycoming 76 Series Engine Overhaul Manual walks a technician from initial teardown through cleaning, dimensional inspection, repair, reassembly, and post-overhaul test running, then backs every step with the model-specific dimensional and torque data needed to accept or reject a part during rebuild.

Table of Limits and Torque Specifications

The largest portion of this Avco Lycoming 76 Series Engine Overhaul Manual is its reproduction of Special Service Publication SSP-1776, broken into Part I Direct Drive Engines, Part II Integral Accessory Drive Engines, Part III Geared Engines, and Part IV Vertical Engines, each split into five sections covering crankcase/crankshaft/camshaft limits, cylinder limits, gear train dimensions, gear train backlash, and torque and spring values. Every entry is keyed to a lettered model chart, so bearing clearances, journal diameters, connecting rod bushing bores, crankshaft run-out limits, tappet fits, counterweight bushing tolerances, and hundreds of torque values are all traceable to the specific engine variant in service.

What This Manual Lets You Do

With the Avco Lycoming 76 Series Engine Overhaul Manual in hand, a mechanic or A&P technician can carry out a complete major overhaul of any covered 76 Series engine: removing and inspecting cylinders, pistons, valves, and the crankshaft assembly; repairing or replacing worn parts to the correct dimensional limits; reassembling the crankcase, ignition system, and accessory drives to factory torque values; and running the post-overhaul test and preservation procedures before the engine returns to service. Working from the correct procedures and the matching Table of Limits entries protects against improper clearances, mistimed ignition, and under- or over-torqued fasteners, all of which affect airworthiness. This Avco Lycoming 76 Series Engine Overhaul Manual is delivered as an instant PDF download, so there is no shipping wait. It opens on a laptop, tablet, or phone at the hangar or in the shop, and it can be printed a page at a time for the bench.