I have a 2yr old B2601 with 113hrs and smelled antifreeze while running it so I shut it off and seen this. I'm guessing it's a head gasket or cracked head. I called my local dealer and I'm just outside the full 2yr warranty but they want $160 an hour for a couple hours to diagnose it and see if it's covered under the 72 month powertrain warranty. Has anyone had this problem with their kubota.