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darhymes wrote:... The modification allows some access to the lifters and cam after the original pushrod tubes and lifter cover are removed (without removing the cylinder). ..
Curiosity got the best of me so I measured how much just the sump of an O-300 holds. Sitting level six quarts comes to about a quarter inch below the top flange. Of course, in the plane the case does not sit level and additional oil would fill the bottom of the accessory case. The centerline of the camshaft is about 1.5” above where the crankcase joins the sump. The tappets are on the same horizontal plane as the camshaft. Even with eight quarts of oil much, if not all, of the camshaft and lifters do not sit bathed in oil.rmorton wrote:… I'm told the cam is down in the oil on the 0300 and should be fine, but the lifters are not and are exposed to potential corrosion after sitting for 15 years. … .
as you can see in the following photos, you should be able see most of the tappet faces by inserting the the probe through the two oil plugs
DWood wrote:An IA I know recommends Aeroshell Plus even for Continentals as it has the additives to protect the cam and lifters.
I was told never to do this if you still have the old pull type starter as it negatively affects the clutch mechanism
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