My check engine light is on at 140,000 miles on a 97 Outback. In check in the valve clearances, an exhaust valve for cylinder 4 has zero clearance at all cam shaft rotations. Is the valve likely broken/cracked/stretched? Is the seal worn? Please advise on likely cause and solutions.
From reading through the forums, I understand that the head gaskets are a problem as well, so perhaps a head gasket/valve job is in order.
Help!