What is a leak down test A leak down test is a method of using compressed air and a specialized gauge set that reads differential pressure to evaluate the condition of an engine’s cylinders, pistons and rings, and valves and seats without disassembling the engine. Disconnect the gauge and move to the next cylinder The overall point is that a leak down tester is a great diagnostic tool to identify real (or imagined) cylinder pressure difficulties But don't be alarmed if you get 15 to 18 percent leak down on. A cylinder leak down test helps me assess internal engine health, isolate failing cylinders, and determine whether an engine needs a simple fix or a full rebuild.
A cylinder leak down test, can tell you if the loss of compression is from, worn rings, burned or stuck open valves or a leaking head gasket.
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