Originally Posted by zerubb' date='07 June 2010 - 02:56 PM
Hi my engine is a Bukh DV-18-ME (18hp). The two previous owners of my 1990 Vertue used the boat infrequently; as a result the engine only has 260 hours. Now the engine starts first time and runs perfectly, but seems to run colder than one would expect. I have changed the thermostat, this made no difference. I have also noticed at the end of a recent 2 hour trip when I was forced to motor due to a lack of wind that a slight oil/fuel? slick was behind the boat, I only noticed this when I was in my berth and about to shut down the engine. I would appreciate any thoughts or ideas.
If it is running colder after say 10 minutes in gear at s say 2,000 RPM - what temperature would that be? A diesel runs more efficiently when hot - many are design set to run between 180 <<>> 200 degrees F. No more than 92 degrees C.
Unusual fault! Cold. What is the flow of water from the exhaust like ? Cold ? Plenty?
Have you checked the oil before and after a day out on the water.