[TrueAirSpeed]

Is a Lycoming 0-540E4B5 (SN L-17939-40A) a wide deck or narrow deck engine? Need to know for prop governor drive ratio.

Thanks in advance!

 

[chevelle000]

Wide deck engine

 

[pazmanyflyer]

Is a Lycoming 0-540E4B5 (SN L-17939-40A) a wide deck or narrow deck engine? Need to know for prop governor drive ratio.

Thanks in advance!

From Service Letter L220C suffix letter designation are:
A = wide deck without roller tappets
E = wide deck with roller tappets
T = new crankcase with large diameter hydraulic lifters
Two digit number (No Letter) = narrow deck without roller tappets

 

[TrueAirSpeed]

Thanks!

To both of you for the quick response.