July 2014- Maintenance scheduled to be performed during a recent annual for my R182 Skylane equipped with a Lycoming O-540 mill included the inspection and reaming of the exhaust valve guides under Lycoming Service Instruction No. 1425.
First you need to determine the valves are not wobbling as per Lycoming Service Bulletin No. 388C. The Lycoming procedure for wobble determination is a bit muddy at times, but if your valves have any perceptible wobble, you do need to ensure you measure that cylinder to the limits called out in the Service Bulletin.
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