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. 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. Differential pressure gauges are a great tool for conducting a leak down test and getting acceptable results on the health of your cylinder, specifically the piston ring, the piston, and the. See tools needed, testing procedures, and how to interpret results on repairpal.
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