Q: I recently purchased a high hour O-320-A1A in an RV-3. The rocker arms were out of limits and I had them rebushed and sized.
The description for the exhaust valve is confusing on Lycoming Service Instruction No. 1451A. Under the cautionary note, the exhaust valve is “identified by the oil drain hole located under the valve end.”
However, the hole that I see is located under the push rod end.
I know I removed the rocker arm with the hole from the exhaust valve, but I do not see how the oil from this hole will lubricate the valve.
This is all probably moot since the engine has been running for 2,200 hours.