A second pressure gauge is used to monitor the amount of air escaping the combustion chamber. The less air leakage the better.
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Motorcycle leak down test. The motion pro leak down tester is designed to check the percentage of cylinder leakage in a 4 stroke engine. A leak down test works by pressurizing the crankcase cavity and cylinder. A plug is inserted into the intake manifold and another plug or block off plate is used on the exhaust to create an airtight cavity. The way a leak down test works is fairly simple. How to perform a motorcycle leak down test. Pit posse pp2723 leak down tester motorcycle tool.
Aircraft mechanics have used this test for a long time. Set the engine at top dead center and attach the leak down tester hose to the sparkplug hole. Refer to your service manual for this procedure. A moisture free air supply of 70 psi to 200 psi is required. With the piston just shy of tdc and the valves closed compression stroke air pressurizes the cylinder to a defined pressure which is recorded by a pressure gauge. How to perform a motorcycle leak down test bring engine to top dead center tdc.
A small air pump is used to pressurize the cavity to 5psi and the pressure is monitored in the cavity for around five minutes. Refer to your service manualfor this procedure. Lock the crankshaft in place. Leak down testing is simply measuring the rate of air leakage past the rings and valves of an engine. Regulate leak down. A leak down test involves pressurizing the cylinders while the engine is a top dead center tdc.
Hook up leak down tester to 40psi shop air supply. Designed to check the amount of cylinder leakage in a 4 stroke engine with an air source of 70 to150 psi this system will pressurize the cylinder with 60 psi of air gauge will register the. Bring engine to top dead center tdc. Put motorcycle in high gear and have a helper apply rear brake. This kit is supplied with a cylinder leakage tester three adapter hoses 10mm 12mm 14mm and carrying case. Remove schrader valve from compression tester hose and insert into plug hole.
Remove schrader valve from compression tester hose and insert into plug hole. Make sure this fits by entering your model number. In this position all the valves will be closed and the only places where pressure can escape is through. The drill is this. Leak down tests can also be used for motorcycles that feature decompression mechanisms 2 strokes.
Gallery of Motorcycle Leak Down Test
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