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Old 07-19-2021, 07:23 AM   #1
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Motor temperature concerns..

My temp gage is running hot. I have 1300 miles on my rebuilt 98.5 Cummins 24 valve.
First trip, temp gage stayed under 1/2 the whole time. Highest egt's. I seen was 1140 or so..
2nd trip the temp gage stayed under 5/8 or so. The highest egt's I seen was right at 1200..
3rd trip the temp gage went up to 3/4 or so. The egt's went up to 1240 before I let off to not see 1250 (the melting point of aluminum)...
Each trip was around 400 miles, early in the morning so road Temps were about the same, and roughly the same road grades...
What could cause this??
I am wondering if I can put a lower tempature thermostat in it??
Any and all advice will be greatly appreciated!
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Old 07-19-2021, 08:55 AM   #2
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Best thing I did was get an engine moderating system. I have a VMSpc which shows all the engine perimeters.



Hot engine>>> first thing to check is how clean the radiator is!!
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Old 07-19-2021, 09:00 AM   #3
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Actually, how clean is the FRONT of the CAC??


That is where most of the dirt and debris will be "filtered out" before that air gets to the radiator which is behind the CAC.
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Old 07-19-2021, 10:38 AM   #4
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Originally Posted by wolfe10 View Post
Actually, how clean is the FRONT of the CAC??


That is where most of the dirt and debris will be "filtered out" before that air gets to the radiator which is behind the CAC.
I had everything out, taken apart, pressure washed, and then put all back together 1300 miles ago...
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Old 07-19-2021, 10:42 AM   #5
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Best thing I did was get an engine moderating system. I have a VMSpc which shows all the engine perimeters.



Hot engine>>> first thing to check is how clean the radiator is!!
I am going to flush it...
When I had it out nothing came out of it to make me think it might need to be flushed...
Looks perfect.. I know looks can be decieving...
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Old 07-19-2021, 10:52 AM   #6
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Are you seeing the high temps only with the EGT or is the engine coolant temp also high? If only EGT then there are other possibilities than the engine's cooling system. ~CA
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Old 07-19-2021, 02:26 PM   #7
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Are you seeing the high temps only with the EGT or is the engine coolant temp also high? If only EGT then there are other possibilities than the engine's cooling system. ~CA
Coolant temp went up each trip...
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Old 07-19-2021, 02:30 PM   #8
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If the cooling package (CAC and radiator) are clean, next thing I would do is change the thermostat. They can hang up-- not opening all the way.
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Old 07-19-2021, 02:44 PM   #9
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What are you doing when this occurs?
This is not flat land EGT's.
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Old 07-20-2021, 06:58 AM   #10
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What are you doing when this occurs?
This is not flat land EGT's.
Traveling over the pass.. 10 mile hills.. ETC..
I see 900 to 1000 degree EGT's all the time on mostly flat slightly hilly terain...
Here in Washington nothing is flat...
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Old 07-20-2021, 07:01 AM   #11
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Originally Posted by wolfe10 View Post
If the cooling package (CAC and radiator) are clean, next thing I would do is change the thermostat. They can hang up-- not opening all the way.
A radiator flush, and a new thermostat are the only things I can think of...
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Old 07-20-2021, 09:31 AM   #12
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When you rebuilt, did you also replace your water pump? All the suggestions so far are on the money.
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Old 07-21-2021, 07:00 AM   #13
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When you rebuilt, did you also replace your water pump? All the suggestions so far are on the money.
Yes the water pump has 1300 miles also..
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Old 07-21-2021, 07:03 AM   #14
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Thx for all the suggestions.. I am going to work on it soon.. next trip is in a couple weeks..
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