B1550 Runs hot / misses

[GDT's Kubota]

I recently purchased a B1550 with 2100 hours. Changed oil, Drained radiator and filled with 50/50 antifreeze. The engine runs hot with small amount of water dribbling out the overflow. The frame beneath the overflow shows signs of long term water contact. The radiator cap is an aftermarket with 13# rating(which is spec). These 2 items suggest this has been a long term situation. The crankcase vent discharges a large amount of steam (water will condensed on floor). The vent also has a grease like discharge. The perplexing thing is that the engine oil does not show any sign of water contanmination. I changed the oil about 3 hours ago. When first started, the smoke is gray with a bluish tint. The center cylinder does not start to fire until the rpm is increased. Once running the smoke will clear up an look 'normal'.
I suspect a head or head gasket problem and the water has affected the injector. Any thoughts?

 

[kuboman]

I recently purchased a B1550 with 2100 hours. Changed oil, Drained radiator and filled with 50/50 antifreeze. The engine runs hot with small amount of water dribbling out the overflow. The frame beneath the overflow shows signs of long term water contact. The radiator cap is an aftermarket with 13# rating(which is spec). These 2 items suggest this has been a long term situation. The crankcase vent discharges a large amount of steam (water will condensed on floor). The vent also has a grease like discharge. The perplexing thing is that the engine oil does not show any sign of water contanmination. I changed the oil about 3 hours ago. When first started, the smoke is gray with a bluish tint. The center cylinder does not start to fire until the rpm is increased. Once running the smoke will clear up an look 'normal'.
I suspect a head or head gasket problem and the water has affected the injector. Any thoughts?

Quite possible you are getting water into the cylinder that is misfiring. It has likely been doing it a while and the cylinder is likely in poor condition. Long term antifreeze consumption will ruin a cylinder and the rest of the engine if run long enough. A tear down will be in order.