My kubota B6200 engine is toast. And I ordered another D850 engine. The problem is that the new D850 engine is therma Siphon system it does not have a water pump. The original D850 in my tractor had one? Someone said I can switch off the front cover of my old engine and put on the good engine and that will add the water pump. But I was just thinking of using the therma Siphon system, from what I have seen the therma system had bigger radiator hoses.... would i need bigger radiator hoses? What do you guys think? Can I just use the therma siphon system? Or should i replace front cover and use the water pump? And if so how long does it take to replace front cover? Thanks