Oil Leak and Valve Guide Seal Test

NOTE: The cylinder leakage detector can be used to test for engine oil leaks and to check the valve stem seals (6571) for leakage.

1. Plug all crankcase openings except the one used for connecting the leakage detector.

CAUTION: Do not exceed 34 kPa (5 psi) or damage to seals and gaskets will occur.

2. Connect the detector to a crankcase opening (oil level indicator tube (6754) is convenient) and adjust the air pressure to 34 kPa (5 psi).

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

3. Remove the spark plugs (12405) and rotate the crankshaft slowly with a wrench. Check for large amounts of air escaping into the cylinders as each intake valve (6507) and exhaust valve (6505) opens.
4. To check for oil leaks, use a solution of liquid soap and water, brush the solution along the gasket sealing surfaces and bearing seals. Look for bubbles or foam.