Service Instruction No. 1483 A

Valve Leak Check with Engine Cylinder Removed

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Supersedes Service Instruction No. 1483

December 21, 2010


All Lycoming reciprocating aircraft engines


In the field, anytime the intake or exhaust valves are removed from a cylinder that has been removed from the engine, the following valve leak check procedure must be done after the valves (new, repaired, or re-used) are assembled with the valve springs and the valves installed in the cylinder

This Service Instruction outlines the proper valve leak check procedure on all Lycoming reciprocating aircraft engines.

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