Basic Engine Diagnosis
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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