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[Chrisdwheeler]

New engine with less than 100 hours was using coolant slowly and showed fuel consuption 15% higher than sister engine on starboard side.  Oil analysis reveals fuel and coolant contamination in the oil.  Any ideas on the problem other than possibly cracked cylinder head?  Thanks for your opinions!

[bigben4ekpo]

My name is Ben,I wont to say that in a situation of the coolant in the oil,I will surges you check the fresh water pump sill and pressure test the cylinder head for cracks,and also engine oil cooler for leakage

[Chrisdwheeler]

Well, we did pressure check the coolant system and did not detect a problem.  We have not been able to find a problem with the fresh water pump. Thanks for your suggestions.  I wonder is a small crack in the head would be undetectable with a coolant system pressure test?

Whatever the problem is, it would have to be something that allow coolant AND fuel into the oil.  I have a mechanic coming to the boat tomorrow and we will see if anything new is discovered.