Is the oil slinger/spacer behind flywheel on a G supposed to have groves on the face that goes against the main bearing housing? There is a groove on the outer edge that I know is supposed to be there. My G started to labor at fast idle with no load. I shut it down right away. After checking everything and cooled down restarted it with no issues. To be on the safe side I wanted to check things more thoroughly. I found that some of the bearing babbit next to slinger was peeled out. That cork o-ring had gotten hot. (Dark color and smelled burnt) Turned crank 3-4 revolutions with oil coming out around bearing. So not an oiling problem. The crank looks good. Need new bearing. What can cause this to happen? Can flywheel be put in too far onto crank? Tractor has been running for the past 3 years with no problems.