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One of the gauges on the tester shows the pressure at which the cylinder is being pressurized 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. The other shows the percentage of the pressure that is being lost through leakage

How to do a Compression and Leak Down test on your engine - YouTube

That percentage tells you the condition of the cylinder We’ll break down the differences between leak down tests and compression tests, explain how to perform them, and help you understand the results so you can keep your engines running strong As with a compression test, leak down variance should be minimal.

Both tools are designed to measure cylinder pressure in order to highlight and diagnose engine problems

A compression test measures the peak pressure within a cylinder at the point of ignition when the engine is turning only at a specific speed On the other hand, a leak down test enables a mechanic to observe how much pressure is lost at a given amount of time, providing insights into leaks occurring at different stages of the engine’s operation. A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ability to hold pressure. A compression test is typically done prior to a leak down test and is an easy way to determine the internal health of your engine