The leakdown gauge is hooked up to the compressed. In a cylinder leak down test the engine is placed on tdc of the cylinder in question.
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Outboard leak down test. In this video i show how to perform a leak down test on the yamaha 50hp outboard motor. Performing a leak down test on an outboard marine engine duration. The internal fuel tank and cover plate are removed to expose t he flywheel. This uses a special set of gauges. A leak down test is performed with the engine not cranking. Dangar marine 24480 views.
The second gauge will show you how much pressure has been lost. Use the leak down test to know if you should be changing head gaskets valves piston rings or looking for a crack. Fuel additive first the engine should be warmed to operating temperature providing it still runs. The first is called a leak down test. If the compression is low in a cylinder its time to find out why. So the compression test measures how much pressure the engine can produce while cranking.
Heres a step by step breakdown of the test. A compression test is a dynamic test engine moving a cylinder leakdown test is a static test engine at rest. Simply put each piston is placed at top dead center and the cylinder is pressurized through the spark plug hole with the leak down tester. One gauge will tell you the pressure of the air compressing the cylinder. So far it is looking like there is a burnt out exhaust valve on cylinder one and maybe two but well find. To perform a leak down test you would pressurize the cylinder with compressed air.
The spark plug is removed. There are two basic ways to compression test an outboard. Performing a leak down test on the yamaha 50hp outboard motor. In contrast to the cylinder leak down test which measures how much pressure is lost in the engine. The gauge measures the amount of air getting past the rings valves or other passages and provides a reading compared with zero leakage.
Gallery of Outboard Leak Down Test
