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Next, we fired up the air compressor for the leakdown test. Powerhouse Products’ leakdown tester requires an external air supply to pressurize the cylinder. The tester has two gauges; one measures the supply pressure, and the other measures the resulting cylinder pressure. We set the supply pressure to 100 psi, rotated cylinder No. 1 to TDC, threaded in our tester, and attached the air hose from the compressor. Proceed in the correct firing order and test each cylinder, and rotate the motor 90-degrees clockwise after each test to ensure each cylinder is at TDC with both valves closed. We plugged the observed numbers into the formula %leakdown = [(supply pressure - cylinder pressure) / (cylinder pressure)] x 100 with the following results... View Related Article
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