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