Performing a leak down test on the yamaha 50hp outboard motor. Performing a leak down test on an outboard marine engine duration.
How To Perform A Leak Down Test On A 4 Stroke Motorcycle
Outboard leak down test. The first is called a leak down test. The spark plug is removed. A compression test is a dynamic test engine moving a cylinder leakdown test is a static test engine at rest. So the compression test measures how much pressure the engine can produce while cranking. Fuel additive first the engine should be warmed to operating temperature providing it still runs. So far it is looking like there is a burnt out exhaust valve on cylinder one and maybe two but well find.
In contrast to the cylinder leak down test which measures how much pressure is lost in the engine. To perform a leak down test you would pressurize the cylinder with compressed air. A leak down test is performed with the engine not cranking. In a cylinder leak down test the engine is placed on tdc of the cylinder in question. Use the leak down test to know if you should be changing head gaskets valves piston rings or looking for a crack. Dangar marine 24480 views.
In this video i show how to perform a leak down test on the yamaha 50hp outboard motor. If the compression is low in a cylinder its time to find out why. There are two basic ways to compression test an outboard. The second gauge will show you how much pressure has been lost. Heres a step by step breakdown of the test. One gauge will tell you the pressure of the air compressing the cylinder.
The gauge measures the amount of air getting past the rings valves or other passages and provides a reading compared with zero leakage. This uses a special set of gauges. 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. The leakdown gauge is hooked up to the compressed. The internal fuel tank and cover plate are removed to expose t he flywheel.
Gallery of Outboard Leak Down Test
