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Differential & Driveline Front and Rear Axles, Lockers, Limited Slip, Yokes, etc


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Old 05-17-2017, 09:28 PM   #1
 
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Default hub temperature
I have an odd question. Has anyone ever read their hubs temperature? I aimed my IR thermometer where you turn them to "free or lock" (warn) and an getting a reading of 145 degrees. Air temp was 80 degrees with normal driving, some stop and starts - no highway driving - about an hours drive.
maybe its me but that seems hot., thoughts?

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Old 05-17-2017, 09:49 PM   #2
 
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I've often touched mine looking for results of bad bearings with no luck of heat at all. Not sure if that's a good test, but it makes sense to me. Mine are always roughly the same temp as say the outer rim or fender.


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Old 05-18-2017, 10:03 AM   #3
 
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Thanks camaro68, im going to pull the bearings, repack them and tetorque them. Im betting they are to tight
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Old 05-18-2017, 11:04 AM   #4
 
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Originally Posted by Sublime View Post
Thanks camaro68, im going to pull the bearings, repack them and retorque them. Im betting they are to tight
No - don't loosen the bearings. It's never a bad thing to renew the grease. But when you reinstall them, bring the torque right back to where it was.

First off a bearing running at 145 F is not considered hot at all. The general rule of thumb for power plant personnel is - if you can keep your hand on a bearing housing (or the hub in your case) for 10 seconds or longer, it is fine.

Second and maybe more important is the proximity of the hub to the brake disc. When everything made up, they are clamped together to form one combined part (the hub and disc assembly - #57).



Most of the heat generated by braking in stop & go traffic is absorbed by the brake disc.

with normal driving, some stop and starts - no highway driving - about an hours drive.

And since the hub/disc flanges are close coupled, a good percentage of that heat will radiate to the bearing housing section of the hub.

Generally speaking, more bearings are damaged by not being tight enough - rather than being too tight.

Just my thoughts.
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Old 05-18-2017, 12:31 PM   #5
 
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Originally Posted by chengny View Post
No - don't loosen the bearings. It's never a bad thing to renew the grease. But when you reinstall them, bring the torque right back to where it was.

First off a bearing running at 145 F is not considered hot at all. The general rule of thumb for power plant personnel is - if you can keep your hand on a bearing housing (or the hub in your case) for 10 seconds or longer, it is fine.

Second and maybe more important is the proximity of the hub to the brake disc. When everything made up, they are clamped together to form one combined part (the hub and disc assembly - #57).



Most of the heat generated by braking in stop & go traffic is absorbed by the brake disc.

with normal driving, some stop and starts - no highway driving - about an hours drive.

And since the hub/disc flanges are close coupled, a good percentage of that heat will radiate to the bearing housing section of the hub.

Generally speaking, more bearings are damaged by not being tight enough - rather than being too tight.

Just my thoughts.

Thats good info. , thank you
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Old 05-18-2017, 02:25 PM   #6
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I had a caliper not releasing enough and did as you did checking the rotor temp with IR thermometer. Temp was 145 to 168 on suspect wheel and 110 on the other 3. Told me there was a braking problem. Changing the caliper fixed it. Can't hurt to repack the bearings Also check for brake pad wear and different wear pattern on the rotor.
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