Service Instruction No. 1483 A

Valve Leak Check with Engine Cylinder Removed

Publications

Supersedes Service Instruction No. 1483

December 21, 2010

MODELS AFFECTED

All Lycoming reciprocating aircraft engines

TIME OF COMPLIANCE

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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