Water Buildup on long trips
HI:
If it is a Yanmar engine, I was seeing a small water build up and while I was checking the move obvious, I finally changed out the water pump and now everything is fine. Note the water pump did not have that many hours on it, certainly less than 250hrs and I would have figured that it would have lasted much longer. Towards the end of this problem the water pump actually seized and I pulled it off and was able to free the turning of the pump so that all seemed fine and the engine ran with no problem. However, after the seizing occurring, I did not wish to take any chances. All the above, for what it is worth.