Jay Honeck wrote:

So we've reached 500 hours on our Lycoming O-540. All is well, and it
continues to run like a champ, using little oil. (Although we still have a
minor drip that's driving us nuts...) and pulling like a tractor.

So what needs to be looked at when 500 hours is reached? I know there's a
Service Bulletin to inspect the impulse couplers, but what else needs to be
done?

It might not be a bad time to have your mags taken apart and inspected.
You can also have your oil cooler flushed, to clear out any junk left
over from the engine break-in. Some people replace their vacuum pumps
regularly, but that depends on the age of the pump, not the engine.


All the best,


David