A few years ago, I had an oil leak in my little Beech Sierra. Everything inside the cowling and the belly of the aircraft were covered with oil. Other than the mess, it didn't seem to be bad because oil consumption hadn't changed noticeably. The shop couldn't find the leak -- mostly because of the mess. I took my pressure washer to the airport and cleaned up the airplane. Then , with the cowling off and my mechanic watching, I started up the engine. Only then could he find the leak. Yup, the oil filter -- a loose fitting. The airplane has been spotless clean ever since.
I've wondered about that to. I have an 0-470, wash down and blow dry can't find a thing on ground run. (and how long you going to run on the ground, cowling off) . A very 'nuisance' leak. After 3 flights you'll see a 'run' coming down the exhaust pipe the next morning on a hgr visit. (BTW, all tube seal were replaced, but looking afterwards on would think it's the seals) Cowled up air flow does crazy things.
A few years ago, I had an oil leak in my little Beech Sierra. Everything inside the cowling and the belly of the aircraft were covered with oil. Other than the mess, it didn't seem to be bad because oil consumption hadn't changed noticeably. The shop couldn't find the leak -- mostly because of the mess. I took my pressure washer to the airport and cleaned up the airplane. Then , with the cowling off and my mechanic watching, I started up the engine. Only then could he find the leak. Yup, the oil filter -- a loose fitting. The airplane has been spotless clean ever since.
I've wondered about that to. I have an 0-470, wash down and blow dry can't find a thing on ground run. (and how long you going to run on the ground, cowling off) . A very 'nuisance' leak. After 3 flights you'll see a 'run' coming down the exhaust pipe the next morning on a hgr visit. (BTW, all tube seal were replaced, but looking afterwards on would think it's the seals) Cowled up air flow does crazy things.