Originally Posted by m0jo
Is there any "tricks" to determining if the oil is actually burning through the valve guides or any where else? When you say valve guides are you referring to the ones on top of the head that the physical valves slide up and down through? How hard are they to change? I work on small engines regularly, just not full size ones.
Also the reason I say the exhaust smells like oil is because one of my friends following me to a trail head told me he smells oil but I myself have not smelled anything in the exhaust which would lead me to believe its only at higher RPMs or under load that it occurs.
I'm not aware of any tricks other than to look at the intake valves and see what is on the back side of them.
Yes, the valve guides on top of the head, where the physical valves move. It's not difficult to change the seals, because the concept is simple. The labor can be a PITA because there's 16 of them, and you have to remove the valve springs and keepers.
You do not need to remove the head or anything, just use some compressed air to hold the valves shut - they make special adapters that screw into the spark plug hole and hook up to your air compressor.
The seals are just little rubber cups which push on and pull off the valve stems, located inside of the valve springs. They're fairly cheap.
At high RPMs or under load is exactly the time when valve seals will leak in fact. Especially since you are dealing with rubber parts, which are very old, and run in a bath of hot oil for their whole lives.