This condition may be caused by the retaining ring on the exhaust valve stem seal not securely holding the seal on the cylinder head boss. If this occurs, the exhaust valve stem seal(s) may move off the cylinder head boss and no longer provide a sealing function between the exhaust valve stem and the valve guide.
You will need to replace the exhaust valve seals if they are not fully seated.
Thursday, July 17th, 2008 AT 6:18 PM