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sure sounds like some sort of galvanic corrosion. When whas the last time the coolant was changed. There are no anodes on that engine. Diesel coolant contains comopounds that act to inhibit galvanic corrosion. This is one reason coolant should be regularly changed. Look in your owner's manual for the interval. Usually the interval is given in engine hours. If it has been more than 2 or 3 years, it's time to change the coolant.
 
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