Closed Cooling Systems in Inboard Engines

[@eddyangueira4369]

Great video! I'm having the exact problem on my 2003 Sea Ray 340 with 8.1 v-drives. Port engine is overheating after a few minutes. Exhaust water flow looks the same on both sides. Water is flowing through the seacock. So I don't think there is a restriction there. My next step is to verify the raw water impeller and check the heat exchanger. I doubt that is the problem because they were serviced a year ago and the boat hasn't ran much the past year. I was leaning towards a bad thermostat since the boat is over 20 years old and never been changed. Then you said something about fuel. I have gotten a check fuel alert. I also have noticed a gas smell when running. It even smells in the cabin. The strong gas smell would indicate running rich and according to the video, would not cause overheating. Is that correct?

[@yorkmarine66]

still learning

[@yorkmarine66]

changed so much in the last 40 years

[@raymondaquino6429]

What part does the outdrive play

[@ReelLocoMarine8]

For a sterndrive system. The drive is the transmission and also has a water pick up just like a outboard. Depending if it is a bravo system the raw water pump will be on the motor, If it is a Alpha system, then the raw water pump is in the outdrive.

[@yorkmarine66]

back in the 80 a brown spark plug was a normal colour