stl_boater
New member
" I have a 1977 Mercury 233 &#
" I have a 1977 Mercury 233 (351ci ford) The impeller recently gave out, and I overheated to the point that the engine was knocking. I shut it down immediately, and there was a lot of smoke in the engine compartment. Thermostat showed a little over 200 when I finally looked at it.(obviously too late)
After a tow back to the harbor, and a couple hours to cool down, I managed to drive the boat back on the trailer without incident.
Complete Impeller pump housing, has been replaced, along with the copper tube.
After I got it all back together, Started her up, to test the pump. I still have excessive smoking in the engine compartment, but, oil pressure is still sitting at 60, oil level is correct,and she still sounds very healthy. No knocking grinding or pinging throughout the RPM range. Also, water never came out of the gimbal ring, but I shut her down when the temp gauge got up to about 140 (got scared).
After shutting her down, noticed there was smoke comming from flame arrestor, and in the valve covers (where the oil goes in.) no water in oil, but oil does look and smell burnt. Obviously, an oil change is next on my list.
So, I guess 2 questions, 1. Is burnt out oil enough to cause smoking, or should I be looking for another cause of the smoke, if so, suggestions please. and 2. does the motor have a thermostat on it like a car, that I should replace? "
" I have a 1977 Mercury 233 (351ci ford) The impeller recently gave out, and I overheated to the point that the engine was knocking. I shut it down immediately, and there was a lot of smoke in the engine compartment. Thermostat showed a little over 200 when I finally looked at it.(obviously too late)
After a tow back to the harbor, and a couple hours to cool down, I managed to drive the boat back on the trailer without incident.
Complete Impeller pump housing, has been replaced, along with the copper tube.
After I got it all back together, Started her up, to test the pump. I still have excessive smoking in the engine compartment, but, oil pressure is still sitting at 60, oil level is correct,and she still sounds very healthy. No knocking grinding or pinging throughout the RPM range. Also, water never came out of the gimbal ring, but I shut her down when the temp gauge got up to about 140 (got scared).
After shutting her down, noticed there was smoke comming from flame arrestor, and in the valve covers (where the oil goes in.) no water in oil, but oil does look and smell burnt. Obviously, an oil change is next on my list.
So, I guess 2 questions, 1. Is burnt out oil enough to cause smoking, or should I be looking for another cause of the smoke, if so, suggestions please. and 2. does the motor have a thermostat on it like a car, that I should replace? "