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