EOT and ECT - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 02-26-2012, 10:04 AM Thread Starter
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EOT and ECT

Headed back to Atlanta from Mississippi and EOT has been steady at 198 and ECT AT 186 averaging 80 mph. Ambient temp today has been in the low 60s. Is that a decent delta?

PS. I have about 77k on the odo.



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post #2 of 19 Old 02-27-2012, 10:16 AM Thread Starter
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No thoughts guys?



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post #3 of 19 Old 02-27-2012, 11:14 AM
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EOT seems high. Should be a 10 degree or less difference.

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post #4 of 19 Old 02-27-2012, 11:29 AM
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That temperature difference is fine - discretely. There is insufficient evidence for the evolving 10-degree indicator...it is a 15-degree indicator (based on the preponderance of warranty claims post-failure where the 25-degree delta was a false panacea). Perhaps watching the delta climb from a 6 to 8-degree difference to a 10 to 12-degree difference is applicable to indication of restriction in the oil cooler but without that degree of specificity then to characterize any delta below 15 is specious.

I am guessing that the OP is running unloaded as the ECT is below the opening threshold of 192-degrees; either that or the thermostat has failed open. Also not knowing your gearing means that it is speculative to determine whether the OP is running in overdrive or a lower gear by travelling at 80mph. The conditions for oil cooler efficiency begin with an engine at operating temperature (not cold start conditions) and highway speeds (55-65mph...not 80mph). It is conceivable that this engine - operating hard against wind resistance - is at the upper end of its powerband running in 4th gear. Even if it is in OD more fuel equals more heat on the oil. That little oil cooler is a marvel but it is a little oil cooler.

My truck has 4.88 gears. I don't think F-350's have better than 4.10s and typically are 3.73s so this is all academic at this point.

...but the temp spread (under the less-than-compliant conditions identified) is fine...

Better to get an assessment under the correct conditions.

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post #5 of 19 Old 02-27-2012, 03:39 PM Thread Starter
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Thanks. Just FYI, tires are stock, gearing is 3.73, and the trans was in OD.



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post #6 of 19 Old 02-27-2012, 05:52 PM
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Put a Coolant filter on it tomorrow, or as soon as you can. Might as well do it this weekend since you'll do it at some point anyway.

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post #7 of 19 Old 02-28-2012, 11:34 AM Thread Starter
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Coolant filter is next on my list. I'm actually changing the oil this weekend but don't know if I'll have time for a coolant flush. I'd like to flush before I install the filter.



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post #8 of 19 Old 02-28-2012, 12:17 PM
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Quote:
Originally Posted by BigLongF350 View Post
Coolant filter is next on my list. I'm actually changing the oil this weekend but don't know if I'll have time for a coolant flush. I'd like to flush before I install the filter.
Wrong move, need to install the coolant filter ASAP to start removing the casting sand should be in place for 5-7000mi to clean the system then do the coolant flush.
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post #9 of 19 Old 02-28-2012, 12:20 PM
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post #10 of 19 Old 02-28-2012, 05:54 PM Thread Starter
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Got it, thanks for the advice.



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