High oil temperature question
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Elder User
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From: NV
High oil temperature question
This weekend I pulled the trailer, about 6000 #, from 2000 to 7000 ft. About half way up I noticed the EOT was high, 255F. I didn't notice any loss of power or see a CEL. ECT was between 190 and 210F. The fan did come on once and the EGT was below 1200F. Ambient was around 100F.
Next day we drove the truck without the trailer and I noticed as it was warming up that the EOT was rising faster than the ECT which suggests that the EOT sending unit is bad. I replaced the engine oil cooler about a year ago and the delta is usually about 6F.
Q1. IIRC you can switch the ECT and the EOT sending units to test them. Is that true?
Q2. Should I have seen a CEL?
Next day we drove the truck without the trailer and I noticed as it was warming up that the EOT was rising faster than the ECT which suggests that the EOT sending unit is bad. I replaced the engine oil cooler about a year ago and the delta is usually about 6F.
Q1. IIRC you can switch the ECT and the EOT sending units to test them. Is that true?
Q2. Should I have seen a CEL?
Lead Driver
Joined: Feb 2011
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From: L.A. (Lower Alabama)
Yup, EOT/ECT senders are the same. One by thermostat housing, other on th oil cooler cover. 255 EOT is pretty hot but I don't think that by it's self will do it. Latest flash monitors EOT/ECT delta and boost pressures and will set a CEL but older flashes don't. I don't monitor EGT's but from what I've read most guys start backing off around 1600*, close to 2k is hot. ECT may be slow to warm up if ther is no coolant on the probe part of the sender. Is coolant level good?
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Elder User
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From: NV
Yup, EOT/ECT senders are the same. One by thermostat housing, other on th oil cooler cover. 255 EOT is pretty hot but I don't think that by it's self will do it. Latest flash monitors EOT/ECT delta and boost pressures and will set a CEL but older flashes don't. I don't monitor EGT's but from what I've read most guys start backing off around 1600*, close to 2k is hot. ECT may be slow to warm up if ther is no coolant on the probe part of the sender. Is coolant level good?
It's a little warm here so I probably will wait for the weekend to try switching the sending units. I'll post an update when I fix it.
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From: NV
The truck hasn't run since Sunday afternoon. Now it's Tuesday, 8:38 pm. I just went out and the ECT reads 81F and the EOT reads 102F, the ambient is 94 F. Maybe I need two sending units? Since the coolant usually reads about 190 I am guessing that the ECT sending unit is OK.
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After a 12 hour rest my temps are within a degree of each other and a degree or so of ambient. Also, I only see 190 ECT on it's way to 196 - 204, which is where mine usually sits, I never see it while in steady driving. I would say try changing the sensors around, but also look for a wiring issue, chafed wires or a loose connector, bad ground.
Brian
Brian
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The truck hasn't run since Sunday afternoon. Now it's Tuesday, 8:38 pm. I just went out and the ECT reads 81F and the EOT reads 102F, the ambient is 94 F. Maybe I need two sending units? Since the coolant usually reads about 190 I am guessing that the ECT sending unit is OK.
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Elder User
Joined: Aug 2010
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From: NV
A quick question. I will have to drain some coolant to change the ECT sensor but will the oil at the EOT sensor have drained back? Or can I expect a mess?
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Elder User
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From: NV
I pulled both sending units and they were a pain to get out, especially the ECT . Rather than switching them, refilling the system and then draining it again I got a mug of boiled water and, using the ECT wiring, dipped them in the water. The ECT wiring was the only one that could be pulled up enough to get the sensor in the mug. They both read the same temperature at about 160 F. I am guessing that the EOT wiring must have a short or frayed cover because when I replaced the sensors, refilled the system and did a test drive all was OK.
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From: Las Vegas, Nevada
I pulled both sending units and they were a pain to get out, especially the ECT . Rather than switching them, refilling the system and then draining it again I got a mug of boiled water and, using the ECT wiring, dipped them in the water. The ECT wiring was the only one that could be pulled up enough to get the sensor in the mug. They both read the same temperature at about 160 F. I am guessing that the EOT wiring must have a short or frayed cover because when I replaced the sensors, refilled the system and did a test drive all was OK.
Freshman User
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I had a customer come in today and his wrench light was on. I checked ECT and EOT
190 and 275. I am guessing tomorrow when its cold both should read around ambient temperature?
If not then there could be a sensor problem or a wiring problem?
Thanks for all the info here. I have an 02 7.3 that I drive but I dont do much diesel work except for mine and my friends. I am just trying to help this customer out.
Thanks
Kevin
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Joined: Apr 2010
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From: Saratoga Springs,UT
I had a customer come in today and his wrench light was on. I checked ECT and EOT
190 and 275. I am guessing tomorrow when its cold both should read around ambient temperature?
If not then there could be a sensor problem or a wiring problem?
Thanks for all the info here. I have an 02 7.3 that I drive but I dont do much diesel work except for mine and my friends. I am just trying to help this customer out.
Thanks
Kevin
190 and 275. I am guessing tomorrow when its cold both should read around ambient temperature?
If not then there could be a sensor problem or a wiring problem?
Thanks for all the info here. I have an 02 7.3 that I drive but I dont do much diesel work except for mine and my friends. I am just trying to help this customer out.
Thanks
Kevin
Yes
If they same after cold soak then watch heat up see if any big jumps up or down or Both
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Elder User
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From: NV
It's back to the normal 6 degree delta. I did a total of 80 miles from 2000 ft to 5000 ft and back with an ATV in the bed. I haven't pulled the travel trailer again but that will happen! I have to believe there is something shorting in the wiring.