Differential Oil Temp ?
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FTE Legend
Joined: Jul 2005
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From: Millersville, MD
Differential Oil Temp ?
Anyone happen to know what the temp of the oil in the differential should NOT exceed? Thinking of installing a new cover with a temp probe fitting in it. Had engine oil temp gauge before I bought my scan gauge and want to hook up the probe to the differential..... pull a 5th wheel and wanna watch it...just because I can.
Postmaster
Joined: Jan 2005
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From: BC Canada
Pretty much don't want to exceed the oil capacity for heat which is 240 degrees, the synthetics are probably ok to 250 used in these differentials. Heavy trucks have gauges on both or all three pumpkins and they watch em cause a bearing set going south will show in the temps on the big trucks. I doubt even pulling at max GCWR you would see a lot over 150 even at high summer temps, maybe 190. I would be interested in seeing your temps, what you run empty, pulling with what weights and ambient air temps. It's probably a lot related to the power you are putting through it, and the load, pulling lots of hills over an extended time, perhaps you will see it going up, but the pyro will be telling you first you have to back out of it.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
When I was a transmission cooling engineer sometimes the trucks I tested had a thermocouple in the diff. When I ran 115°F ambient, max GCWR, and an 8% grade I would see temps near 300°F. Where do you get 150-190°F from?
Lead Driver
Joined: Jul 2004
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From: Foothills, CA
Do you have any data to back that up, or are those guesses?
When I was a transmission cooling engineer sometimes the trucks I tested had a thermocouple in the diff. When I ran 115°F ambient, max GCWR, and an 8% grade I would see temps near 300°F. Where do you get 150-190°F from?
When I was a transmission cooling engineer sometimes the trucks I tested had a thermocouple in the diff. When I ran 115°F ambient, max GCWR, and an 8% grade I would see temps near 300°F. Where do you get 150-190°F from?
I think we're overdue for the updated rear cover and new fluid if that's the case -- we don't run at max CGVWR, but by the time we add in the pushing-a-brick-thru-the-wind aerodynamics of a slide in camper and that we do long pulls up grades, I bet the pumpkin is toasty...Plus the updated cover just looks cool
I'm hitting easy street
Joined: Nov 2009
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From: Central Oregon
I guess I'll be needing to quickly jump out and take a temp reading with the temp gun some day.
The semi's I have driven in the past ran temps of 180-210, depending on many different things. Had one rear end once reach 230, while the front one was running lower. Just not sure what that temp was. That was running North bound in the summer on I-17 towards Flagstaff. Loaded with 450 head of sheep.
The semi's I have driven in the past ran temps of 180-210, depending on many different things. Had one rear end once reach 230, while the front one was running lower. Just not sure what that temp was. That was running North bound in the summer on I-17 towards Flagstaff. Loaded with 450 head of sheep.
Posting Guru
Joined: Sep 2009
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From: Virginia beach, VA
Do you have any data to back that up, or are those guesses?
When I was a transmission cooling engineer sometimes the trucks I tested had a thermocouple in the diff. When I ran 115°F ambient, max GCWR, and an 8% grade I would see temps near 300°F. Where do you get 150-190°F from?
When I was a transmission cooling engineer sometimes the trucks I tested had a thermocouple in the diff. When I ran 115°F ambient, max GCWR, and an 8% grade I would see temps near 300°F. Where do you get 150-190°F from?
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
A half hour at a time, usually. That's running in a wind tunnel. I could get the same temps on a road that we often tested on, too. That was Arizona 68, heading up towards Union Gap from Bullhead City, AZ. It was about 12 miles at an average of 8% grade. It usually was over 110°F in Bullhead City.
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
It depends on what type of diff. An open diff will use the spider gears to allow the two sides to turn at different speeds. That will make a very, very small amount of additional heat. A limited slip will slip a clutch and will produce more heat.
Posting Guru
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From: Virginia beach, VA
A half hour at a time, usually. That's running in a wind tunnel. I could get the same temps on a road that we often tested on, too. That was Arizona 68, heading up towards Union Gap from Bullhead City, AZ. It was about 12 miles at an average of 8% grade. It usually was over 110°F in Bullhead City.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
I'd set the do not exceed at 320°F.
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FTE Legend
Joined: Jul 2005
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From: Millersville, MD
As I will if/when I get the new cover. Will prob get it before the camping season gets here. Looks like the only cover available that already has the bung for the probe is the Mag Hytech. $247.00 on Amazon
Thanks for the best guess Mark. 320* sounds good to me too!
Thanks for the best guess Mark. 320* sounds good to me too!