Operation of the Lycoming O-540 oil pressure relief valve and its installation 

Thanks for this video! I actually used your excellent explanation and demonstration to adjust the externally adjustable oil relief valve on my 1939 Lea-Francis Super Sports 1.6 litre automobile engine. 😄

thanks a lot bless keep filming and sharing as educationally

Thought the pressure relief was in the oil filter.

good job

how many pounds per washer?

do you have a similar video for continental o-470 ?