Someone explain my delta temps - Ford Powerstroke Diesel Forum
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Old 06-10-2012, 05:15 PM
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Someone explain my delta temps

A couple of months ago, I experienced my first 15deg delta temp. Since then they have slowly crept up. I start figuring out it's time to change out the oil cooler (first time, 114k). So I change the coolant to ELC and install a coolant filter. I figure on running this for a thousand miles before switching out the oil and EGR cooler.
Today I was taking a trip to the beach (100 miles) and had for the first time a 20deg delta. However, the ECT never got above 184, and 184-204 was the difference most of the way. Coming back with temps a humid 85, I did the the ECT to 190, but did not seem to affect the EOT.
I would say I need a new thermostat to go with everything. But will this actually change the deltas? I don't want to spend thousands of dollars replacing crap if all I need is a new thermostat. And I have never had the EOT above 215deg.
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Old 06-10-2012, 05:37 PM
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Change the thermostat and retest.
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Old 06-10-2012, 06:57 PM
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correct! ECT should always be 190 or higher that is the normal operating temp.
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