Operating instructions
Table Of Contents
- 1 Introduction
- 2 General Description
- 3 Special Tools and Equipment
- 4 Disassembly
- 5 Cleaning, Repair and Replacement
- 6 Inspection
- Definitions
- Magnetic Particle Inspection
- Critical New Part Dimensions
- Fluorescent Particle Inspection
- Dimensional Inspection
- Protective Coatings
- Crankcase Inspection
- Crankshaft Inspection
- Camshaft Inspection
- Connecting Rod Inspection
- Gear Inspection
- Piston Inspection
- Cylinder Inspection
- Inspection Chart
- Crankcase Stud Heights
- Mag Particle Inspection Procedures
- Table of Limits
- Torque Specifications
- General Torques
- Table of Limits Chart
- 7 Assembly of Subassemblies
- 8 Final Assembly and Test
- 9 IO-520-M
- 10 IO-520-BB, CB and MB

A IO-520 Series Engine Overhaul Manual
31 August 2011
Supersedure Notice
This manual revision replaces the front cover and list of effective pages for Publication Part No. X30039, dated
September 1977. Previous editions are obsolete upon release of this manual.
Effective Changes for this Manual
0 .......... September 1977
1 ............31 August 2011
List of Effective Pages
Document Title: IO-520 Series Engine Overhaul Manual
Publication Number: X30039 Initial Publication Date: September 1977
Page Change Page Change Page Change Page Change
Cover............................1
A...................................1
i thru v ..........................0
1-1 thru 1-10.................0
2-1 thru 2-10.................0
3-1 thru 3-2...................0
4-1 thru 4-30.................0
5-1 thru 5-12.................0
6-1 thru 6-30.................0
7-1 thru 7-8...................0
8-1 thru 8-20.................0
9-1 thru 9-8...................0
10-1 thru 10-2...............0
Published and printed in the U.S.A. by Continental Motors, Inc.
Available exclusively from the publisher: P.O. Box 90, Mobile, AL 36601
Copyright © 2011 Continental Motors, Inc. All rights reserved. This material may not be reprinted, republished, broadcast, or otherwise
altered without the publisher's written permission. This manual is provided without express, statutory, or implied warranties. The publisher will
not be held liable for any damages caused by or alleged to be caused by use, misuse, abuse, or misinterpretation of the contents. Content is
subject to change without notice. Other products and companies mentioned herein may be trademarks of the respective owners.