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Garden tractor engines have crankcase back pressure, blowby, and/or crankcase pressure. Different names, same thing.
How does a mechanic measure crankcase back pressure? Is there a gizmo for this?
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"How does a mechanic measure crankcase back pressure? Is there a gizmo for this? "
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RB wrote:

Engines run a slight vacuum in the crankcase or they will leak oil from everywhere. They usually create this vacuum by venting the crankcase to the intake between the carb and the air filter. I don't know of any reason or way to measure it. Why do want to do that anyway?
Possibly you are thinking of a leak down tester? to test the rate of pressure leakage in a cylinder...
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