ECT vs EOT bigger 15 deg when cold
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Junior User
Joined: Dec 2009
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ECT vs EOT bigger 15 deg when cold
Driving on the highway with 75mph I can see a difference of up to 18 degree. ECT is then 186, outside temp around 5. If outside temp is around 40, ECT is more around 190 and difference 12 to 14 degree.
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
Is this normal or do I have to think of replacing oil and EGR cooler?
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
Is this normal or do I have to think of replacing oil and EGR cooler?
Senior User
Joined: Nov 2010
Posts: 172
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From: wildwood, mo.
According to the tsb, your coolant temp has to be above 190 for the test to mean anything. That being said, you stated that you are getting close to that when you ect is 190 or above. You may be getting blockage in the oil cooler. JMO
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
Driving on the highway with 75mph I can see a difference of up to 18 degree. ECT is then 186, outside temp around 5. If outside temp is around 40, ECT is more around 190 and difference 12 to 14 degree.
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
Is this normal or do I have to think of replacing oil and EGR cooler?
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
Is this normal or do I have to think of replacing oil and EGR cooler?
You don't indicate what the actual EOT temp, but unless it's ABOVE the
ECT then you don't have a problem, add unless the engine is fully warmed
up (ECT is 190) then you can't make any decisions.
Even in FL, when it's 60*F outside, once the ECT reaches 190, it does drop to 188* until the EOT gets hot enough to keep the ECT @ 190*.
I haven't driven in summer temps yet.
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
After replacing my t-stat, doing the coolant flush w/vc9
@ hi-way speeds (70 to 75MPH) ECT/EOT temps would rise to 190/205 and got as high as 190/208. I still took a 1300 mile trip in November
and it performed great, but I knew I needed to repair this before it got
bad.
The temp delta indicates a partially blocked oil cooler. Left unchecked, the egr cooler can overheat and start to leak coolant into the exhaust which can feed back into the intake and cause bigger issues.
My 6.0 is getting the bulletproof egr and oil coolers installed as I type.
So, I won't have to drive watching my ECT/EOT temps any more.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
ok, that's the key. When I bought mine in Oct '10, my temps would stay in the 175 to 185 range. I learned that indicated my t-stat was bad.
After replacing my t-stat, doing the coolant flush w/vc9
@ hi-way speeds (70 to 75MPH) ECT/EOT temps would rise to 190/205 and got as high as 190/208. I still took a 1300 mile trip in November
and it performed great, but I knew I needed to repair this before it got
bad.
The temp delta indicates a partially blocked oil cooler. Left unchecked, the egr cooler can overheat and start to leak coolant into the exhaust which can feed back into the intake and cause bigger issues.
My 6.0 is getting the bulletproof egr and oil coolers installed as I type.
So, I won't have to drive watching my ECT/EOT temps any more.
After replacing my t-stat, doing the coolant flush w/vc9
@ hi-way speeds (70 to 75MPH) ECT/EOT temps would rise to 190/205 and got as high as 190/208. I still took a 1300 mile trip in November
and it performed great, but I knew I needed to repair this before it got
bad.
The temp delta indicates a partially blocked oil cooler. Left unchecked, the egr cooler can overheat and start to leak coolant into the exhaust which can feed back into the intake and cause bigger issues.
My 6.0 is getting the bulletproof egr and oil coolers installed as I type.
So, I won't have to drive watching my ECT/EOT temps any more.
Famous last words!
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
Driving on the highway with 75mph I can see a difference of up to 18 degree. ECT is then 186, outside temp around 5. If outside temp is around 40, ECT is more around 190 and difference 12 to 14 degree.
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
Is this normal or do I have to think of replacing oil and EGR cooler?
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
Is this normal or do I have to think of replacing oil and EGR cooler?
Sorry.
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Elder User
Joined: Aug 2010
Posts: 675
Likes: 1
From: NV
You can try blocking the radiator with cardboard to see if the engine coolant temp gets up to 190 and then read the EOT. Maybe block off half the radiator to start with?
There are several posts here on how to do the engine flush. Do it before you change the cooler. My EGR cooler leaked so I had to replace the EGR and the EOC before I could flush the system. You are in a better place but don't wait! The EGR system feeds into the intake manifold and the combustion chambers. The first sign will be white smoke and possibly leaking head gaskets
There are several posts here on how to do the engine flush. Do it before you change the cooler. My EGR cooler leaked so I had to replace the EGR and the EOC before I could flush the system. You are in a better place but don't wait! The EGR system feeds into the intake manifold and the combustion chambers. The first sign will be white smoke and possibly leaking head gaskets
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Junior User
Joined: Dec 2009
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Sounds like I soon have to have it repaired.
How much does it cost to replace the oil cooler and the EGR cooler? Is it necessary to replace both or is oilcooler alone sufficient? I can not do it myself but have to give it to a repairshop.
How much does it cost to replace the oil cooler and the EGR cooler? Is it necessary to replace both or is oilcooler alone sufficient? I can not do it myself but have to give it to a repairshop.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
If the EGR cooler hasn't failed then I don't see a reason to do anything but the oil cooler. IIRC it's usually about 8 hours labor to replace the oil cooler. Maybe Cheezit can chime in here. If you were close to me I'd make you a deal--LOL.
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
You definitely want to do both. The coolant flow is serial through both coolers, so if either has restricted flow, they both have restricted flow.
Prices are all over the map, and I didn't have to pay, so I'm not sure what it will cost you. You also want to consider the aftermarket oil coolers, and your choice there will affect the price. Some searching here will show what others have paid. My only advice on that is, that if you have a good independent shop that knows the 6.0, it will cost you less than the dealership.
Prices are all over the map, and I didn't have to pay, so I'm not sure what it will cost you. You also want to consider the aftermarket oil coolers, and your choice there will affect the price. Some searching here will show what others have paid. My only advice on that is, that if you have a good independent shop that knows the 6.0, it will cost you less than the dealership.
Elder User
Joined: Aug 2010
Posts: 675
Likes: 1
From: NV
Did you try to get the engine temp up to 190? What were the results?
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Junior User
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If the engine temp (ECT) is around 190* then I see a difference of 12 to 14 degree driving with 75mph.
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
During summer I have seen 8 to 12 degree difference with ECT around 200 and outside temperature around 90 to 95.
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