Lycoming's Engine Troubleshooting Guide provides a chart that may be useful as a diagnostic guide to some common and recurring problems, causes, and solutions. Federal Aviation Regulations, Part 43, provides specific regulations regarding maintenance, repairs, and alterations and persons authorized to perform maintenance, repairs and alterations. Anyone not properly certified and not possessing the ability must not attempt to perform any service or maintenance, including any procedures listed in the Troubleshooting Guide.
Lycoming's Engine Troubleshooting Guide is available on-line in electronic form.
Engine Troubleshooting Guide
The SSP-475 Trouble-Shooting Manual in hard copy format contains the same information and is available for purchase directly from Lycoming or through your Lycoming Distributor.