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. Learn how to perform the cylinder leak down test for precise engine diagnostics and troubleshooting with autozone. A cylinder leak down test measures how well an engine cylinder holds compressed air pressure Unlike a standard compression test, which only provides a peak pressure reading, the leak down test introduces regulated air and quantifies the pressure loss as a percentage. Grab one of these leakdown testers and become a gearhead md They’ll help you diagnose common engine maladies
Including bad piston rings, leaking valves, and blown head gaskets The beauty of the leak down test is, you can test only low cylinders, or you can test all the cylinders to determine overall engine condition.
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