Forum Discussion

aluminum_flyer's avatar
Jun 25, 2014

Wheel Bearing Temps & Test Drive

I have a 2010 KZ RV CL164 and repacked the bearings this spring (single 3500# axle). I have done bearings before (on a small pop-up) but never took the temp with and IR temperature gun.

Here is what I found. I don't have time to take it for a longer trip before my big vacation trip. Otherwise I would.

About a 40 mile round trip broke up into there and back segments with an hour in between. I dragged it along to an appointment. Trying to kill 2 birds with one stone.

After coming back the bearings were 85 degrees F. I sparingly used the brakes (manual transmission helps out with that) to get a more accurate reading as well. The latest Good Sam magazine said 165-185F was typical bearing temps. I would think that if they were too tight they would have gotten hotter than 85F in that time. Correct thinking?

I did check after the repack and there was a small amount of 'wiggle' in the rim (bearings)... grabbing the rim and rocking back and forth.

The rubber temperature of the tire (sidewalls and tread) was also 85F as a side note.

Any suggestions, comments or concerns?
  • Quit worrying. If they are all the same temp they are normal. Pull the heck out of it. Trouble with technology is it causes more problems that it ever relieves. I am against computers.

    Help stamp out help stamp out causes!
  • It was at highway speed (~60 MPH). I know that it was a shorter distance than ideal. I guess what I am looking for is some reassurance that after 40 miles something would have 'blown up' if repacked improperly. Just like when I rebuilt the truck differential... if you make it 10 miles then your good. Otherwise it would eat itself up and spit out metal chunks.
  • Depends on how fast you were going. If you were at 65 mph for a few hours on the road, they would be hotter.

    On our trip last weekend, it was in the 90's outside, and the tire temps on my TPMS were 117-123 depending on wheel, so the bearing was probably hotter. I was running at 70 mph.

    I don't think bearings get "up to temp" like an engine does, since there is nothing regulating temp except grease and airflow. Overall bearing temp is a function of speed, duration and ambient temps. Assuming all is working weel, the bearings shouldn't get hotter than 165 or so.
  • I know I only went 20 miles, stop for an hour, then 20 miles home. How long do you think bearings take to warm to temp?
  • What was the ambient temp? That has a lot to do with it. You wouldn't get an 85* reading on a 95* day (like it is here today)....