Service Instruction No. 1483 A
Valve Leak Check with Engine Cylinder Removed
Supersedes Service Instruction No. 1483
December 21, 2010
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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