Sounds like what they are doing is venting the crankcase into the intake so any blow-by gets reburned. That is good for keeping the engine clean and oil control, but bad for the crank seals. It tends to draw a slight vacuum in the crankcase, which causes the seals to run dry and draw in dirt.
That's similar to what the PCV valve does on a gas engine, sends crankcase gasses back through the intake to be burned. The newer engines are sealed better than the old ones. No place for the crankcase gases to escape, but it's not sealed. It is vented to the intake through the PCV or whatever means it uses to relieve crankcase pressure. When it's running all the incoming air is accounted for through the MAF (mass air flow) sensor, all the outgoing gasses are processed through the converter.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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