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Lars(wi) 
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Joined: 14 Sep 2009
Location: Permian Basin
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 Topic: High engine oil temp
Posted: 24 Jul 2022 at 12:52pm |
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1999 KW T800B, ISM, over 1 million on the odometer.
Coolant level good
Engine oil level good
Engine fan cycles normally, engine does not overheat.
Oil temp tops 230, and climbs driving at Hwy speeds, not a concern doing in town delivering.
Engine will shut down close to 240deg.
15w40
Question: is the oil pan temp sensor the only access for the ecm? Or, is there another sensor the ecm reads for engine oil temp?
TIA
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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plummerscarin
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Posted: 25 Jul 2022 at 6:45am |
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Thinking out loud here. Are you going only off the gauge reading or have you tried checking temp of oil pan with IR thermometer for comparison?
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DMiller
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Posted: 25 Jul 2022 at 6:53am |
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According to a friend of mine still in the commercial truck industry, the Oil Pressure and Temp sensor is a single unit, No Oil pan sensor. If have a Gauge attached to a sensor in the pan it is on its own and not associated to the ECM.
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jaybmiller
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Posted: 25 Jul 2022 at 6:56am |
have no clue but... is the oil PRESSURE good ?
?? if it was low, less oil flows, could heat up ??
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Lars(wi)
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Posted: 25 Jul 2022 at 7:01am |
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This engine definitely has an oil pan temp sensor, you see it standing on the ground, drivers side.
If too high of temp, idiot light and buzzer comes on, engine will shut down if temp hits 240 or so.
Do not have an IR gun, yet. But will be getting one.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Lars(wi)
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Posted: 25 Jul 2022 at 7:08am |
 jaybmiller wrote:
have no clue but... is the oil PRESSURE good ?
?? if it was low, less oil flows, could heat up ??
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About 35psi or so, at Hwy speeds. For a Cummins that’s not bad.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Ed (Ont)
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Posted: 27 Jul 2022 at 9:25pm |
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That oil pressure is spot on for that ISM.
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im4racin
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Posted: 27 Jul 2022 at 9:35pm |
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There is a temp sensor in an oil gallery on the right side if I remember correctly. It will shut down if it's too hot. The gauge in dash is the sensor in the pan. Based on what you said put an oil thermostat in it. I'm pretty sure it has one but it's been a few years since I was that deep in an m
Edited by im4racin - 27 Jul 2022 at 9:36pm
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DaveKamp
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Posted: 31 Jul 2022 at 12:25am |
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One thing that will cause the oil temperature to rise, is if the pump is ingesting air. If there's a slight crack in the oil pump pickup, you'll get that ingested air on the upstream side of the pump, and a high pressure from the downstream side to the pump, where the much higher pressure compresses the (ambient temp) bubbles to a mush smaller volume.
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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DonDittmar
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Posted: 31 Jul 2022 at 6:59pm |
DMiller wrote:
According to a friend of mine still in the commercial truck industry, the Oil Pressure and Temp sensor is a single unit, No Oil pan sensor. If have a Gauge attached to a sensor in the pan it is on its own and not associated to the ECM. |
On a new truck that is true
Not on a 1999. 1999 would have the old style dash. And if the truck has the optional engine oil temp gauge then it will have a pan sensor
Should be the same sensor as the ones used in the rear axles, NOT the transmission. The one in the trans has a different temperature range. K379-12 is the old school pan sensor part number. You may try swapping it for a rear axle unit and see if that changes things.
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DonDittmar
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Posted: 31 Jul 2022 at 7:01pm |
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Unless it’s an aftermarket shutdown unit, which I have seen before, then that sensor is communicating with the ecm somehow. It’s the only way it can shut it down
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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