I posted about the leakdown readings I had gotten on my O-360 A1A. It was a brand new engine with 120 hours on it after 1 year and the #1 cylinder was reading 80/68 or 70 while the rest were at 80/ 77, 78 & 79.
I first tried staking the valve as some suggested. It did not seem to do anything. Next I followed aerhed's advice and unsprung the valve dropped the exhaust pipe and brushed on some valve grinding compound around the valve seat. I hand ground it by pulling out on the stem. I cleaned it all up well and ran it. Then I rechecked it with a leakdown check. It's now at 80/74. I think I'm going to leave it there and run it for a while and see how it does. I looked at the mating surface of the valve while it was apart and it looked perfect. I though I was going to see a burn't valve, but it looked fine. I couldn't see the seat but I'm not as worried about that.
What do you think should I leave it or try a little more grinding? Thanks for the suggestions guys.
I first tried staking the valve as some suggested. It did not seem to do anything. Next I followed aerhed's advice and unsprung the valve dropped the exhaust pipe and brushed on some valve grinding compound around the valve seat. I hand ground it by pulling out on the stem. I cleaned it all up well and ran it. Then I rechecked it with a leakdown check. It's now at 80/74. I think I'm going to leave it there and run it for a while and see how it does. I looked at the mating surface of the valve while it was apart and it looked perfect. I though I was going to see a burn't valve, but it looked fine. I couldn't see the seat but I'm not as worried about that.
What do you think should I leave it or try a little more grinding? Thanks for the suggestions guys.