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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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