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Old 11-26-2011, 11:42 AM   #1
mathura
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High oil Temp -Mack Engine

What can cause the oil temperature to run high while coolant temperature is normal.
I was told that the oil temp is running high but engine coolant temperature normal. I worked on this job before with the same probelm about 2 months ago and I removed the oil temperature thermostat and the probelm was solved. I have not looked at the truck as yet but will do so soon. Its a Mack MP8 engine.

Suggestions guys
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Old 11-26-2011, 03:19 PM   #2
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Bad guage or sending unit?

Bad oil cooler? Or is the driver leaving out that the coolant is overheated at the time the oil is?
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Old 11-27-2011, 10:03 AM   #3
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Well I plan on using an infrared thermometer to check because the logics does not add up, how can oil be hot and coolant normal.
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Old 11-27-2011, 06:13 PM   #4
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What is a normal oil temp on the MP8? What is the temp the oil is getting to?

I know the ISX Cummins oil temp runs 225-230*, and Cummins says that is normal. Personally, I'd rather see it under 200*.
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Old 11-27-2011, 08:17 PM   #5
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I have no Mack experience, but if you removed the oil cooler thermostat then the oil would take the path of least resistance. Oil temperature in a modern engine is very important, too cold and it will not flow properly to cool the pistons, to hot and it could break down.
A clean cooling system, would be the first thing I would do. Look for the use of a sealant the oil cooler is where it would coat, all hot spots get the most.
Just a thought!
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Old 11-27-2011, 11:39 PM   #6
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My advice is to go over to bigmacktrucks.com and ask about your engine. There is some dealer mechanics on there and i think i have seen were they hace talked about this problem. that is if your gauges are good.
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Old 11-28-2011, 02:39 AM   #7
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[I spoke with the driver yesterday and he told me if the A/C is on the oil temperature remains normal. As soon as he turns the A/C off the oil temp goes to red within 10 mins.
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Old 11-29-2011, 12:56 AM   #8
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Quote:
Originally Posted by mathura View Post
[I spoke with the driver yesterday and he told me if the A/C is on the oil temperature remains normal. As soon as he turns the A/C off the oil temp goes to red within 10 mins.
Sounds like the engin coolant temp is incorrect and reading low. This way it could have the coolant running on the hi side but the ecm sees it still cold. This would let the engine shut down not work proper and also the engine coolant tem gauge is ecm driven and it just reads what the ecm thinks. and also the ecm is controling the fan. But when the a/c is on the fan is on. But with the a/c is off the fan is off and the coolant temp as well as the oil temp comes up and the oil temp is probly on a sendor by its self.
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Old 11-29-2011, 06:58 AM   #9
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I have not done any work on this truck as yet because they are still using it to run short distance but the driver told me that it seems to him that the fan is the probelm. When he turns the AC on the fan runs.
He said that he was comparing the truck with another standing side by side and the other truck fan keeps cycling on and off, while his own never turn on.

I think akerstwo has a valid point
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Old 11-29-2011, 11:04 PM   #10
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Quote:
Originally Posted by bmoeller View Post
What is a normal oil temp on the MP8? What is the temp the oil is getting to?

I know the ISX Cummins oil temp runs 225-230*, and Cummins says that is normal. Personally, I'd rather see it under 200*.
Well for Mack it is 175F - 200F

I have not attend the job as yet but will let you know. Just looking for ideas from you guys who has always been very helpful.

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