A leak down test works by charging air through the spark plug hole into the cylinder when valves are closed, then checking for air escaping through the intake or exhaust to identify worn valve seats or other engine leaks.
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THIS Is How A Leak Down Test Works!Added:
So if the valves are closed, there should be no air here coming out of coming out of the intake.
Should be no air coming out of the exhaust if these valve seats are in good shape and the valves are closed. We're charging air here through the spark plug hole and the pistons up all the way to the top. So we're charging a small area of no valves and it full of air. We're trying to see where the leaks are.
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