How it’s used (basic steps)
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Remove spark plug from the cylinder you wish to test.
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Attach the kit’s adapter into the spark plug hole.
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Supply compressed air (per the kit’s specification) into the cylinder via the kit.
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Observe the gauge(s) — note how much pressure remains or how much leakage occurs.
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Compare results among cylinders (one good cylinder vs suspect ones) to identify abnormal leakage. If a cylinder leaks significantly more, you may suspect ring wear, valve issues, gasket/head crack, etc.
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Also listen/observe where air is escaping (into the crankcase = rings, into intake/exhaust manifold = valves, externally = head gasket/cylinder wall)
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