I'm surprised to hear of this failure at all, say nothing of on such a new boat. I'd suspect that this engine has been overheated at some point in order for this many O-rings to fail. Any info on the number of hours on this engine? Regards, John "Seahorse" Larry Rick writes: The problems with the engine were just what we expected, o-rings in the transmission cooler had failed, and another one on the fitting between the coolant reservoir and exhaust manifold. Unfortunately, this later one required the removal of the coolant reservoir and exhaust manifold in order to replace it. The parts arrived from the US in record time by FedEx, and with the help of mechanic Pascal we soon had things up and running.