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Ernie, I would have thought it to be only that, too, except that he says it burped coolant which is not a symptom of wet stacking. Those upper radiator tanks had so much room at the top for expansion of coolant, if it's burping coolant, and it is not over filled, he has something going on up there that he has to pin down. If it is a leaky head gasket and he takes it out and really lays into it and it gets a big gas bubble formed around the temp gauge bulb in the upper pipe and insulates the true temperature from the ehter bulb, he could be in for a really bad day. Also, in my experience, a two cylinder diesel in good repair won't develop wet stack in just one day of loafing around. He needs to make sure that the "oiliness" is not glycol from the antifreeze forming a soap with the greasy soot and that that is the liquid that is spraying out of the stack. I hope it just needs some load time, but to tell you the truth, a weak one almost always continues to wet stack just a little all the time. A tight one takes along time to get any oil in the stack, by which time it goes back to work and the oil gets burned out. I know when I put a loafer on my dyno and smoke the old paint off the outside and the grease out of the inside of the muffler, all manner of wear and sins are revealed!
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