Join Date: Mar 2000
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It sounds resonable to me the exhauts expelling together with hot water, some vapor too, particularly at lower ambient temperatures. Also when probably reaching 3.000 rpm or + you will get a lot more white smoke. The latter is more related to excess of force required to the engine.
As said by our colleague, 3/4 feet of white smoke should not be a bad new.
However, is quite difficult to distinguish a normal white smoke from an abnormal one. It seems that the difference is the quantity. The white smoke might come from a broken gasket or even worse a broken cilinder wall. In your case having heat interchanger, this should be clearly noted by the loss of cooling water. Which is not your case.
If the vapor is coming from water in the diesel fuel, then it also be noticed since it will produce starting and running problems.