February 25, 2011
All Lycoming engines incorporating parallel valves except O235 Series, O290 Series, O320H Series and TO360E Series.
TIME OF COMPLIANCE
Anytime valve rocker assemblies are removed.
This Service Instruction identifies Rocker Arm Assembly P/N 17F19357 to be installed on the parallel intake and exhaust valves on all cylinders. Rocker Arm Assembly P/N 17F19357 supersedes Rocker Arm Assembly P/N 17F19353
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