Oil Leak and Valve Seal Test

An Engine Cylinder Leak Detection/Air Pressurization Kit can be used to test for engine oil leaks and to check the valve stem seal for leakage.
1. Plug all crankcase openings except the one used for connecting the leakage detector.
2. Connect the cylinder leak detector to a crankcase opening (oil level indicator tube is convenient) and adjust the air pressure to approximately 34 kPa (5 psi).
3. Using a solution of liquid soap and water, brush the solution along the gasket sealing surfaces of the valve cover and oil pan. Look for bubbles or foam.
4. Remove the spark plugs and rotate the crankshaft slowly with a wrench. Check for large amounts of air escaping into the cylinders as each intake valve opens. The spark plugs on the leaking cylinders will probably show deposits of burned oil.