Lycoming service bulletins

Hi. Lycoming Mandatory Service Bulletin 359 relates only to Lycoming O-235 F and O-235 G engines. These engines have a different power rating than the more common O-235 L engines.

The service Bulletin requires the owner/operator to replace the normal Champion REM38E Spark plugs because they are too HOT for the engine and may cause detonation (pre-ignition) which will seriously damage the engine. The Bulletin recommends replacement of the REM38E plugs with AC-86 Spark Plugs which must be gapped between .018 inches and .022 inches.

Hope this answers your question: Rgs. Bob