Posted by Bob on January 05, 2018 at 21:33:14 from (64.255.159.199):
In Reply to: 520 breather line posted by jdfamily on January 05, 2018 at 19:30:22:
This system works differently from engines where the crankcase ventilation system is simply vented to the intake air system.
There's a ventilator pump in front of the governor (the fanshaft drives it) that draws clean air through the tube from the air intake ahead of the carb and forces it into the crankcase, which pushes combustion byproducts out of the crankcase, to the valvecover, and out to the atmosphere through the crankcase vent tube hanging below the valvecover.
For oil to be moving the wrong way, and entering the air intake system, either the ventilator pump has failed, or your air cleaner or air intake system are clogged up and sucking air backwards through the ventilator pump. Or, the engine has a TREMENDOUS amount of blowby.
The ventilator pump components are shown at the lower left area of this parts breakdown. If power-steering equipped, ventilator pump is the same, but PS pump is also driven by the fanshaft
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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