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I think I figured out the root cause of the temperature spikes... When starting up the tractor the other day I noticed the radiator overflow tank was bubbling, but it was cool to the touch so it wasn't boiling. When the thermostat opened and coolant circulated the bubbling stopped. Looks like...

Thanks for the comments SpudHauler. I'll certainly re-torque the head tonight. The thermostat was brand new, but if I have to open up that port again I'll probably disconnect my thermal sensor at the rear and flush from that side as well. When I originally flushed the system I didn't remove...

Sorry, try this link. Yes, I start by turning on my glow plugs for at least 10 seconds. https://www.dropbox.com/s/h2fjh8azbkhvrat/ZD28%20Start-Up.docx

I ran the temperature trace this weekend and also monitored the sensor voltage to the instrument gauge. It shows the red line spikes are start-up and stablized after about 8 minutes. My white smoke is pretty brief now, I'm guessing my oil and filter change may have helped. Here's the link to...

Thanks for the advice, I will check the thermo-sensor. I basically did the same thing for the new and old thermostat to show that the new one is functioning properly (it opened sooner and quicker than the old part). The thermo-sensor switch turns out to be connected to a loud horn. I...

I recently acquired a 2003 ZD28 72" pro deck. The unit runs and cuts well but I've noticed on start up that the temperature gauge gradually increases but keeps going to red line and will sit there for 3-5 seconds before quickly dropping back down. This will repeat about 5 times before settling...