Suzuki DF 70 Overtemp

[uvdynamics]

I have a 1999 df 70 with very low hours, about 250. Last season it ran fine but the telltale stream was looking a little weak so I had my mechanic, a Suzuki dealer intall a new pump this year. My first time out it was pumping great and started right up. I went out for a cruise and ran it up to 4200 with no problems. The rest of the day I ran it at about 1500. After being out for a few hours I was idling and the overtemp alarm came on. The water was coming out fine and it was cool. I checked the block and it was cool too. I checked the oil and found it way overfilled and the oil looked milky. Has anyone seen this or have any ideas.

 

[lakensea]

Re: Suzuki DF 70 Overtemp

Your thermostat is stuck open - a good Suzuki tech would have diagnosed it right away.

 

[uvdynamics]

Re: Suzuki DF 70 Overtemp

Thanks for your help. A few questions based on your answer; if the thermostat is stuck open doesn't that mean that water is flowing through the water jacket all the time and would therfore result in lower temperatures, so why an overtemp alarm? Also if the oil level is high can the oil become emulsified without water intrusion. Am I correct that emusified oil loses its lubricating and cooling quality and may contribute to higher cylinder temperatures. One last question where exactly is the overtemp sensor located on this engine?

It looks like a thermostat change is pretty simple on this engine, easy to get to.