Where is the best place to measure engine temp

[woodlandfarms]

I am working through an over temp issue on my oil cooled tractor engine (Deutz f1011 4cyl). I have a long list of tests but where is the best place to measure an engine temp correctly? It is not the oil radiator. Oil filter seems outrageously hot. Oil pan?

 

[MinnesotaEric]

The best place is to measure engine temperature is either in the oil/water cooling jacket in the head or on the hot side of the thermostat. Have you looked at the t-stat? [URL="http://www.foleyengines.com/resources/tech-tips/tech-tip-151-deutz-model-1011-2011-thermostats-都pring-ahead-fall-back?]According to this article[/URL], in your engine it is common for them to be installed backwards leading to overheating.