EOT low maybe?
Fleet Mechanic
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From: 'Pitlock, Maine
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First off my thanks to all. I think everyone was safe on their assumptions I feel the truck had run far enough, long enough, ECT to be at unloaded style operating temperatures. Now after a cold soak the temps koeo are ewt 67* eot 60.9* ambient temp. 75* It was my thoughts that the t-stat was working as the truck's high temp would reach 181* then would drop to 179* so I assume a 180* t-stat in good working order. Got to go back out today will see what numbers it produces. Again my thanks to all.
Fleet Mechanic
Joined: Jul 2013
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From: 'Pitlock, Maine
First off my thanks to all. I think everyone was safe on their assumptions I feel the truck had run far enough, long enough, ECT to be at unloaded style operating temperatures. Now after a cold soak the temps koeo are ewt 67* eot 60.9* ambient temp. 75* It was my thoughts that the t-stat was working as the truck's high temp would reach 181* then would drop to 179* so I assume a 180* t-stat in good working order. Got to go back out today will see what numbers it produces. Again my thanks to all.
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From: Stuttgart, Ar
First off my thanks to all. I think everyone was safe on their assumptions I feel the truck had run far enough, long enough, ECT to be at unloaded style operating temperatures. Now after a cold soak the temps koeo are ewt 67* eot 60.9* ambient temp. 75* It was my thoughts that the t-stat was working as the truck's high temp would reach 181* then would drop to 179* so I assume a 180* t-stat in good working order. Got to go back out today will see what numbers it produces. Again my thanks to all.
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Ok. New info. Interstate driving 70mph, 2100rpms, ICP floating from 1311 to 1482. Now back to water and oil. EWT 182* and EOT 126*. So npccpartsman might be on to something, stopped by the Zone and the t-stats rated at 190* no EOT sensor available but they do carry the EWT sensor. Now if I follow these post right it sounds like the two are interchangeable, right? Is there any other reason for the roughly 50* difference or go ahead and start changing out parts?
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Fleet Mechanic
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From: 'Pitlock, Maine
. Mcrafty1
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From: Stuttgart, Ar
First off let me start by saying I'm not looking for an argument just good info. So I will ask you this, when you are under no load other than the truck itself and chugging around town with the ambient temp say around 75* your ECT stays at or above 190*? I ask this because my truck stays closer to 180* and doesn't get that hot unless I'm towing or crowding it but after it gets to 190* under load it stays around that as long as I keep working it (indicating to me that the Tstat is functioning properly). I believe these motors like most other diesels bypass a certain minimal amount of coolant even with the Tstat closed at least any other diesel I know of does, therefore the temp should struggle to stay up to the Tstat temp when not under load. I'm curious as to whether or not this is what others experience with their 6.0's or if I should go get a Tstat and replace mine. Thanks for the input from one and all. Mcrafty1
. Mcrafty1
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I did have this problem, my EOT was not getting up to operating temp. Cold soak was good, ECT and EOT were within 2 deg. I dug around by the oil temp sensor, made sure the wires were in good shape and not oil soaked burned ect. The next day EOT was back to normal.
Fleet Mechanic
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I started a thread just because of this very question. My new thermostat's start out 188-190 and gradually fall off. I'm on my 3rd now and I can't believe that they all "fail" to the cold side, but they never seem to "recover" and correct operating temps are important.
.
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From: Middle Tn.
My ect's are always above 190 after warm up no matter wether loaded or unloaded. My eot's did go about 10 degrees cold on me a couple years ago. I unplugged and replugged the sensor and all has been well since. Weak connection is my assumption.
Fleet Owner
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From: Spanaway
By reading this I think the Op has a bad T-stat and most likely a
bad EOT sensor. You can test it or swap it out for a new one.
A diesel likes it heat to a point. Running a cold engine will lower the
combustion efficiency.
Sean
