Valve guides--usually intake guides--leak oil into the combustion chamber, where it's burned, and then exits via the exhaust. Intake guide leaks usually are more noticeable under high vacuum conditions. Exhaust valve guides leaking oil are seldom major smoking problem, but they may coat the exhaust manifold with oil if they're severe enough.
When you have oil smoke in the breather, think about how it got there in the crankcase...it could ONLY be the rings, providing nothing's cracked.
Get a leakdown tester, and perform a leakdown test. While oil smoke on startup ONLY [or on deceleration/high vacuum conditions] is usually a sign of valve guides, constant smoking out the breather can ONLY be caused by bad rings. You may unstick 'em with ATF, or you may have to bite the bullet and tear it down.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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