Outside Diameter Leaks

Check for Oil leaking between the outside diameter of the valve guide and the cylinder head casting. (To help identify an oil leak between the outside diameter of the guide and the cylinder head casting, apply several drops of engine oil dye around the outside diameter of the valve guide and allow to sit for a minimum of three minutes. Use Black Light Kit to identify oil leak location.) Oil leaking between the outside diameter of the valve guide and the cylinder head casting can be caused by a damaged cylinder head casting valve guide bore. If oil is leaking between the outside diameter of the valve guide and the cylinder head casting, install an oversize valve Guide