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Old 05-18-2016, 05:15 PM   #1
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laser thermometer

I just changed the wheel bearings and drove it about 5 miles down the road. stopped and felt the hubs and they felt warm. Drove home and parked it and felt the hubs and they seemed hot. I put my thumb on the part sticking out right against the drum, after about 5 seconds it felt like it might burn. All the hubs felt the same temp. I seated the bearings and backed off the nut and then finger tight. I used a lithium EP grease.
1 how hot should they be?
2 if measuring the heat with a laser thermometer wear do you point to measure?
3 What brand of laser do you use? Lowes has one for about $20.
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Old 05-18-2016, 05:41 PM   #2
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Mine do get warm, but never hot. I do not recall what is a normal temp, as I have not checked them this year.
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Old 05-18-2016, 05:48 PM   #3
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I have one from Harbor Freight that I used for years. Before that, I would lay my hand on the hub and make sure I could touch it w/o getting a burn. Not top scientific a?

Now that I have the TPMS I don't use it as often but what I did then was check the temp of all 4 hubs in the same spot and look for them to be within 10-15 deg. of each other.
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Old 05-18-2016, 06:18 PM   #4
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My question is where do you take your temperature measurements from?


In the image above, I've pointed out 6 spots that I toyed with b/c they are all easily accessible without removing the wheel and they each had different temperature readings when I tested:
1) Rotor/Disc
2) Rotor where it meets the hat
3) Rotor hat
4) Edge of Hub
5) Face of Hub Flange
6) Dust Cap

I assume 1,2,3 are irrelevant b/c they are the rotor not the hub.
I figure #4 is irrelevant b/c while it's technically part of the hub, it's further away from the portion of hub that makes contact with the grease.

I think #5 and #6 are the right places to measure but wanted to know what others think and use as a guage? Also, what temperatures do others use as a guide for "too hot"?
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Old 05-18-2016, 06:19 PM   #5
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If you can put your finger on it for any length of time it is likely fine. They are not going to be cold they are going to get warm. Touch the hub of your TV for reference.
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Old 05-18-2016, 06:29 PM   #6
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It's possible that your brake shoes are over adjusted, or that maybe you just used your brakes a lot during your drive. Just a thought on another possible cause of the heat. And no, they shouldn't get so hot you can't hold your hand on them. Mine just become mildly warm, like they'd feel good to hold in my hands on a cold day.
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Old 05-18-2016, 06:46 PM   #7
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Is it possible that you set your break controller so that the TT is doing most of the breaking? You may want to check that out

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Old 05-18-2016, 07:16 PM   #8
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your right. I did notice that my breaks are strong. Ill turn down the controller and keep feeling. It also did seem hottest the closer I got to the hub area with the breaks.
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Old 05-18-2016, 08:11 PM   #9
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I don't recall the brand laser thermometer I bought, but it was $20 at SAMs Club. Got one if those, "What do you need that for" looks from the better half, so I told her it was to see how hit the campfire was!!! Lol

I don't remember how hot our hubs or tires run but they were all within about 15* or each other....

I try to check them after getting of the expressway (freeway) with very little stop and go before checking (like at a rest area).
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Old 05-19-2016, 07:18 AM   #10
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If memory is right, my front hubs ( measured at the hub ) were about 123-125 degrees, and the rears showed about 115 or so. Not sure what's "normal", but I check at every stop along the way, and see if they're hotter than the last check. The temps probably won't be exactly the same from one check to the next. It'll depend on outside temps, and how long you waited to check them after stopping, how hard you braked last, etc. It's more of a reference for me.
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