What a thermostat does is that it gets the whole engine warm at about the same rate.It kind of balances the heat,and makes the engine work better,especially a Diesel.You are right about it being hotter and sealing better. Now,what are you having a problem with?Loosing coolant?You dont say why you dont have a thermostat in it.You dont say if you can see where the coolant is leaking out or if it is. You could put a thermostat in and see if that fixes it.You could see if you have any water leaking to the outside,or into the oil,you could pull the exhaust manifold off and see if one of the ports is clean which would mean its getting water from that cylinder. Diesels run better when they are about 190 degrees like somebody else said.Since they dont have spark plugs it takes heat to ignite the fuel,and at 190 degrees is how they are made to operate.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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