EOT/ ECT Large Differential
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Junior User
Joined: Mar 2010
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EOT/ ECT Large Differential
Over the Summer, Oil Cooler failed on my 2003 F-250 4X4, 126K miles. Replaced it with OEM Cooler, Flushed the radiator, changed the waterpump. Was still seeing a high EOT/ECT differential, and truck runs great.
So in an effort to cure the problem with many folks including the dealership, giving me good advice I changed the EGR and temp sensor. Again OEM.
So now I drive around town with ECT almost always at 189-191 according to my scan guage. EOT is 208 to 215.
Now I hook up the 5th wheel, 9K and pulling down the interstate at 60 MPH in towing mode,,, and my eyes are on the scan guage,,,ECT 190-195,,,EOT 236 237 238.
I only pulled it 30 miles and truck ran fine,, but I worry when the EOT gets that high.
I am looking for some Ideas. One fellow told me that my timing could be set to high and the engine is running too hot. ( could that be a possibility)? and if so How would you check it?
By the way the Service dept at the dealership has no ideas., At least none.
My goal is to pull the trailer at 70 Mph, without hurting the engine by cooking the oil.
So in an effort to cure the problem with many folks including the dealership, giving me good advice I changed the EGR and temp sensor. Again OEM.
So now I drive around town with ECT almost always at 189-191 according to my scan guage. EOT is 208 to 215.
Now I hook up the 5th wheel, 9K and pulling down the interstate at 60 MPH in towing mode,,, and my eyes are on the scan guage,,,ECT 190-195,,,EOT 236 237 238.
I only pulled it 30 miles and truck ran fine,, but I worry when the EOT gets that high.
I am looking for some Ideas. One fellow told me that my timing could be set to high and the engine is running too hot. ( could that be a possibility)? and if so How would you check it?
By the way the Service dept at the dealership has no ideas., At least none.
My goal is to pull the trailer at 70 Mph, without hurting the engine by cooking the oil.
Post Fiend
Joined: Jul 2005
Posts: 6,127
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Do you have a coolant filter?
What is the actual differential at the point of measurement?
Not the ranges --- specifics at given time.
My immediate thought (which you are not going to like) is that you got more casting sand dislodged, and your brand new oil cooler is clogged again.
If that is the case, you are in for another oil cooler / EGR cooler.
Another possibility --- was the plenum cleaned thoroughly of carbon builds?
Do you have any codes?
Have you had bad fuel?
Do you burn biodiesel (any blend)?
Do you use cetane boost? Powerservice?
What is the actual differential at the point of measurement?
Not the ranges --- specifics at given time.
My immediate thought (which you are not going to like) is that you got more casting sand dislodged, and your brand new oil cooler is clogged again.
If that is the case, you are in for another oil cooler / EGR cooler.
Another possibility --- was the plenum cleaned thoroughly of carbon builds?
Do you have any codes?
Have you had bad fuel?
Do you burn biodiesel (any blend)?
Do you use cetane boost? Powerservice?
Thread Starter
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Junior User
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I do not have a coolant filter yet. I was trying to get the temps corrected before I installed one. I did follow Fords rec. flush procedures, simple green, distilled, vc-9 etc and the ect temps are perfect. I am using the Ford Gold .
The true differential is running around 33-35 degrees, when pulling the trailer. 20- 25 under no load.
There are no codes,, no guages out of range, no red lights
I don't burn bio diesel, and use centane boast every third thank.
I am concerned because the specs for the oil are 200-230 in the severe range and driving down the interstate getting high 230's is not good.
The true differential is running around 33-35 degrees, when pulling the trailer. 20- 25 under no load.
There are no codes,, no guages out of range, no red lights
I don't burn bio diesel, and use centane boast every third thank.
I am concerned because the specs for the oil are 200-230 in the severe range and driving down the interstate getting high 230's is not good.
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
Going on the theory that your new oil cooler might be plugged again, I think you should install a coolant filter kit and run it for a month, or until it stops flowing, whichever comes first. Then open the filter and inspect. If you've got crap floating around, it will show up in that filter.
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Post Fiend
Joined: Jul 2005
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bpounds:
I am leaning your way --- but I would, at the same time as installing the coolant filter, toss in a new thermostat.
Just to rule out 2 birds with one stone.
I am leaning your way --- but I would, at the same time as installing the coolant filter, toss in a new thermostat.
Just to rule out 2 birds with one stone.
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Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
He already changed the t-stat in post #6.
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Junior User
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Ok, I will put the coolant filter in, can you suggest a good one that I can get my hands on easily. I would like to work on this as early as I can.
Also,, no one thinks timing of the engine could have anything to do with it?? I thought that was a long shot.......
Also,, no one thinks timing of the engine could have anything to do with it?? I thought that was a long shot.......
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
Can you rule out a bad thermostat brand new out of the box?
Or the wrong one?
Or it installed backwards?
Why not check if he is installing a coolant filter and opening it up anyways.
The thermostat on this thing isn't cheap, but for the price of a gasket and an additional 30 min of work... it may avoid doing a new oil / egr cooler and then finding it didn't do the trick because it was a bad thermo all along.
Or the wrong one?
Or it installed backwards?
Why not check if he is installing a coolant filter and opening it up anyways.
The thermostat on this thing isn't cheap, but for the price of a gasket and an additional 30 min of work... it may avoid doing a new oil / egr cooler and then finding it didn't do the trick because it was a bad thermo all along.
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
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From: Lakewood, Ca.
His coolant temps are perfectly normal. No reason to suspect any problem with the coolant thermostat.
Dieselsite & Difuser both make popular coolant filter set-ups for the 6.0.
http://www.dieselsite.com/index.asp?...ROD&ProdID=324
http://www.dfuser.com/catalog/ford-s...oolant-kit.php
Dieselsite & Difuser both make popular coolant filter set-ups for the 6.0.
http://www.dieselsite.com/index.asp?...ROD&ProdID=324
http://www.dfuser.com/catalog/ford-s...oolant-kit.php
Last edited by SteveBricks; Dec 25, 2010 at 11:44 AM.
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
or
http://www.dieselsite.com/index.asp?...S&Category=618
Forget the thermostat. Your thermostat only does one thing - control coolant temp. You don't have a coolant temp problem. If anything yours is a little lower than normal, which is just fine.
The oil is cooled by heat transfer to the coolant. For some reason you are not getting a good transfer, and lack of flow is the most likely problem, assuming all the sensors are being honest with you.