I thought I would post for assistance on this issue as I have been unable to solve on my own. I have browsed most all of the oil in coolant threads on here and have followed and checked most of the action items concerning this issue but have failed to ID the problem.
History of the repairs to date.
found coolant in crankcase, removed head, took to Kubota dealer for evaluation, the head was cracked, weld repaired the head and had it resurfaced. replaced #1 piston and rings (piston on radiator side) replaced head gasket. ran engine for approximately 20 minutes then oil showed up in radiator. remove head and installed the O ring I missed on the oil tube to head and re-used head gasket. re-assemble and run engine 20 minutes with the same condition, oil in the radiator, and a small amount of water in the crankcase. (< 5 oz of water) dis-assembled head purchase new head gasket and new oil tube O ring, stone cylinder block and head re-assembled ran engine 20 minutes with same condition. performed pressure test on radiator. pressure loss at 25 lbs is 2 psi in 1 minute, cold. pressure gauge is static while engine runs at 25 lbs on system. and 0 pressure lost on system after engine warms up after running 5 minutes. I will drop the oil pan today and pressurize the cooling system and see if I can locate the internal coolant leak. has anybody else has this issue? and does anybody have any ideas what else to check? I'm in a tight spot! thanks in advance for any feedback!
History of the repairs to date.
found coolant in crankcase, removed head, took to Kubota dealer for evaluation, the head was cracked, weld repaired the head and had it resurfaced. replaced #1 piston and rings (piston on radiator side) replaced head gasket. ran engine for approximately 20 minutes then oil showed up in radiator. remove head and installed the O ring I missed on the oil tube to head and re-used head gasket. re-assemble and run engine 20 minutes with the same condition, oil in the radiator, and a small amount of water in the crankcase. (< 5 oz of water) dis-assembled head purchase new head gasket and new oil tube O ring, stone cylinder block and head re-assembled ran engine 20 minutes with same condition. performed pressure test on radiator. pressure loss at 25 lbs is 2 psi in 1 minute, cold. pressure gauge is static while engine runs at 25 lbs on system. and 0 pressure lost on system after engine warms up after running 5 minutes. I will drop the oil pan today and pressurize the cooling system and see if I can locate the internal coolant leak. has anybody else has this issue? and does anybody have any ideas what else to check? I'm in a tight spot! thanks in advance for any feedback!