UTU survey

also the temp is hovering around 205 with a 180 thermostat...not good! what's your normal operating temperature for idling in the yard?

thanks
karl f

Pay little attention to the books' advice for carb needle setting! My experience is individualy carburetors vary all over the place. If you can find settings where the engine runs well disregard what the book says. (FWIW the power screw on my UTU like it about 3-1/2 turns out - and it runs great there.)

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As for temperature, the gage on my U (which has a 160 deg t'stat) rises only to about 150 deg when sitting at idle. When being worked however it may climb to 160 - 180 depending on load and ambient temperature.

If the tractor is put right to work after a cold start the gage may climb as high as 200 very briefly. Just as the gage tops out the radiator will "burp" and may even spill a little coolant. Then the gage falls very rapidly (matter of a few seconds) to 150 or so. The gage will then be stable the rest of the day.

I think what is happening is it takes the thermostat a couple minutes to respond once the coolant reaches the t'stat's 160 deg opening temperature. Thus the engine temp "overshoots" briefly until the t'stat becomes stabilized.

You can check the float level on the older Marvel Schebler carbs that have the Marvel/Schebler logo on the side with a clear hose attached to the drain. The line above Schebler is the float level line.

You didn't say if your thermostat had a bypass hole in it. Those in-the-radiator thermostats let the engine get really hot if they don't bypass a bit of hot water so they can sense what is going on in the engine. I just drilled three or four 1/8" holes around the circumference of my thermostat before I installed it.

so i got a few unexpected things to fix :)

karl f

karl