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In crankcase filter box
Vacuum should always be present in crankcase, it is provided by the PCV (positive crankcase ventilation system) pressure is what you don't want to see.
...It will be what ever your suction pressure is.
Because there is a vacuum in the crankcase. There should be a slight vacuum due to the positive crankcase ventilation. If there is excessive pressure or vacuum, you have ring blow-by, meaning your rings are shot.
With a tool called a slack tube manometer.
combustion pressure will leak into the crankcase, and oil from the crankcase will leak into the cylinder.
1. The crankcase breather may be plugged. or---- 2. Too much crankcase pressure. There is too much blowby (combustion gasses leaking by the rings or piston), causing excessive pressure in the crankcase. To repair this, you will need to re-ring or bore out the engine with new pistons and rings.
If the rings are completely worn out they can put more preasure in the crankcase than the pcv can handle. Have it checked out.
split open the crankcase
There is not a pressure switch however there is a temp warning sensor on the back of the crankcase in the bottom
Did you mean PCV [positive crankcase ventilation]....that valve helps keep engine gasses from going to the atmosphere but wont allow intake pressure back to the crankcase.
Chech the pcv valve. The oil is due to excess crankcase pressure.