Reply to thread

Message: <blockquote data-quote="Chessie" data-source="post: 133123" data-attributes="member: 21571">Crankcase pressure can only come from the combustion pressure not being contained in the combustion chamber. So either the rings are loose and leaking (blow by) or the valves are not seated well and some of the pressure goes around the valve seat and into the head and back down into the crankcase through the oil drain holes. Since the head is already off, it's time to reseat the valves (assuming there are no cracks and imperfections... time to have the head machined flat after it is tested for cracks) and install new rings. I have the same engine, but I haven't taken in apart ..  I don't know if there are oversized rings available or if you can sleeve it, but you may be looking at machining the bores... it's worth it at this point of dis-assembly...That Kubota is a good, hard-working engine that wants to live... you may as well rebuild it.Good Luck!</blockquote>