"hi ive just got a boat with a lister petter lpw4,ive ran it for about 20 hours and it all seems fine, the engine temp stays between 80 and 90 depending on the rpm,but i have noticed a light on the pannel witch meens engine coolent temp, ive often put my hand in the water spiting out and its always cold,the engine was in a narrow boat and was keel cooled, but is now water cooled and thats all i no its 7 year old and i no nothing about inboard engines,i would be greatfull if any one can help cheers"