The crankcase should normally run under a slight vacuum. If you have water problems in the crankcase you probably also have a frozen breather valve which will cause it to spout out oil.
Last year, I started my cub cadet snow blower and it blew oil out and made a mess. A quick shut down and let the engine soak a little a restart and no problems the rest of the winter. It was inside a heated garage but is quite cold near the floor but this surprised me. I did have that happen one other time when in cold storage upon start up. That was years ago.
I thought for sure the piston had bit the dust but I used it a whole lot after that with no problem.
A lot of the breathers on those small engines are a reed valve mechanism and totally unlike breathers on automotive engines.
A good engine will splatter oil out of the dip stick for instance if you pull it out with engine running, yet if you seal it with a vacuum gauge it will show a slight vacuum.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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