Home › Forum › Ask A Member › Lightwin 3 HP gets hot › Re: Lightwin 3 HP gets hot
You mention replacing the impeller, was it broken apart? If so, little pieces of impeller debris love to jam up cooling passages. You are sure the water pump impeller housing is OK, and the water tube grommet is not pinched, how about the sealing surface between the SS impeller plate and gearcase? I know you mentioned that there seems to be a decent spray mist coming from the exhaust reliefs, but that doesn’t mean the cooling system is AOK.
Did the engine appear to have overheated before you worked on it? If not, I would suspect something is not quite right with the water pump, perhaps the water tube is bent and rubbing the driveshaft also. Otherwise, it is time to pull the head and exhaust cover to clean out the tiny water passages. There is an elbow on the stbd side of the powerhead that loves to get plugged up as well. Sometimes, just running these little engines in our dirty test tanks (pine needles?) will introduce enough debris to plug things up as well.