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In this video i show how to use the leak down tester from harbor freight 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. In order to perform the test the cylinder needs to be at top dead center on the compression stroke.

The overall point is that a leak down tester is a great diagnostic tool to identify real (or imagined) cylinder pressure difficulties Learn how to use a leak down tester on an engine effectively, with insights, tips, and real owner experiences for accurate diagnostics. But don't be alarmed if you get 15 to 18 percent leak down on.

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. See tools needed, testing procedures, and how to interpret results on repairpal.

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