High engine oil temp
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Forum Name: Shops, Barns, Varmints, and Trucks
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=189675
Printed Date: 06 Sep 2025 at 2:46am
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Topic: High engine oil temp
Posted By: Lars(wi)
Subject: High engine oil temp
Date 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 ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Replies:
Posted By: plummerscarin
Date Posted: 25 Jul 2022 at 6:45am
| 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? |
Posted By: DMiller
Date Posted: 25 Jul 2022 at 6:53am
| 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. |
Posted By: jaybmiller
Date Posted: 25 Jul 2022 at 6:56am
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have no clue but... is the oil PRESSURE good ? ?? if it was low, less oil flows, could heat up ?? ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Lars(wi)
Date 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. ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: Lars(wi)
Date Posted: 25 Jul 2022 at 7:08am
About 35psi or so, at Hwy speeds. For a Cummins that’s not bad. ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
jaybmiller wrote:Posted By: Ed (Ont)
Date Posted: 27 Jul 2022 at 9:25pm
| That oil pressure is spot on for that ISM. |
Posted By: im4racin
Date Posted: 27 Jul 2022 at 9:35pm
| 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 |
Posted By: DaveKamp
Date 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. ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: DonDittmar
Date Posted: 31 Jul 2022 at 6:59pm
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. ------------- 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 |
Posted By: DonDittmar
Date 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 ------------- 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 |