Oil Leak and Valve Seal Test

The cylinder leakage detector can be used to test for engine oil leaks and to check the valve stem seals for leakage.
1. Plug all crankcase openings except the one used for connecting the leakage detector.
2. Connect the leakage detector to a crankcase opening. The oil level indicator tube is convenient. Adjust the air pressure to approximately 21 kPa (3 psi).

CAUTION: Use extreme caution when pressurizing crankcase. Applying air pressure above specified pressure risks damage to seals, gaskets and core plugs. Under no circumstances should pressure be allowed to exceed 21 kPa (3 psi).

3. Using a solution of liquid soap and water, brush the solution along the gasket sealing surfaces and bearing seals. 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 and exhaust valve opens.

The spark plugs on the leaking cylinders will probably show deposits of burned oil.