[dvogtvpe]

Originally Posted by J-Mech

I'm not going to disagree that it may have a vent problem. But, on a fresh rebuilt, the drain better not be plugged because if it is, there's bigger issues. Now, the reed valves in the vent may be in wrong, but if that were the case, I think either the dipstick would have blown out, or a seal. So, probably not a vent problem.

vent problem would blow oil past the crank seals before anywhere else. been there seen that.




I don't disagree about this point on merit. But, this is a fresh rebuild with only 26hrs. There is no way that carbon from burnt oil wore the cylinder out in 26hrs. That would take nearly 100hrs on an old engine to wear it that bad. No way a new engine with 26hrs burning oil would do that. Besides, it takes quite a while on a hard load for a motor to burn oil efficiently enough to make carbon like that. Most guys don't run these engines hard or long enough to occur that kind of damage from carbon. Now, a big tractor pulling a disk..... different story.

My assumption is still improper clearance, either on ring gap, or skirt clearance, which caused pre-mature cylinder wear. Damage was done before oil consumption/carbon was an issue.

that's allot of wear in a short period of time. I've probably worked on more engines than the majority of the posters here combined have seen in their life . probably rebuilt 6-700 of them. when you see that kind of wear in a short period you think 2 things. dirt wipeout of improper clearance.