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Old 06-25-2008, 08:31 PM   #1
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wheel bearings

I had a friend mention to me the other day about repacking the wheel bearings with greese from time to time. Just wondering how often this should be done and such.

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98 TJ I4 in "chili pepper red" on 31x10.5x15 BFG A/Ts on black rims. soon 2" BB and some other goodies!

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Old 06-25-2008, 08:42 PM   #2
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Your '98 TJ's front bearings are sealed into what is called a unit bearing. It's sealed and considered non-serviceable. The unit bearing assembly is easily replaced as a bolt-on unit when it goes bad, usually not before 100K miles or so. The rear axle's bearings are constantly lubricated by the axle lubricant held in the center pumpkin.

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Old 06-25-2008, 08:53 PM   #3
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ok, i was wondering if that was the case. kinda figurered it was. they are not giving me any problems w/ almost 104k on it!
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Old 06-25-2008, 09:09 PM   #4
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They tend to run ~$150 per side....so no need to rush things.
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Old 06-25-2008, 09:10 PM   #5
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They tend to run ~$150 per side....so no need to rush things.
yup! i dont think they need it and there is a lift that needs to be done to my jeep!
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Old 06-26-2008, 01:53 AM   #6
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you can go to rockauto.com and get them for 80 bucks. and there timken bearings. I bought one from autozone at 140 for the life time warrenty and the second form rock auto for 80 shipped.
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Old 06-26-2008, 04:21 AM   #7
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$80 is an amazing price for Timken hub assemblies!
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Old 06-26-2008, 06:57 PM   #8
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Quote:
Originally Posted by Jerry Bransford View Post
Your '98 TJ's front bearings are sealed into what is called a unit bearing. It's sealed and considered non-serviceable. The unit bearing assembly is easily replaced as a bolt-on unit when it goes bad, usually not before 100K miles or so. The rear axle's bearings are constantly lubricated by the axle lubricant held in the center pumpkin.
Jerry, have you ever seen the inside of a unit bearing? We went to pull one off a buddy's rig the other day and the damn thing came off in two halves. Interesting to say the least. And we were taking them out to change them anyway. I had never seen the inside though. Pretty good setup.
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Old 06-26-2008, 07:02 PM   #9
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Jerry, have you ever seen the inside of a unit bearing? We went to pull one off a buddy's rig the other day and the damn thing came off in two halves. Interesting to say the least. And we were taking them out to change them anyway. I had never seen the inside though. Pretty good setup.
No, I never have but yeah I'd like to see one or a photo of one some day. What made it come apart? Did he try to drive on it without the outer stub shaft installed?
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Old 06-28-2008, 04:20 AM   #10
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nothing really holds them together, ive had them come apart just removing them from the vehicle.
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Old 06-28-2008, 11:03 PM   #11
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Yeah I have had them come apart just taking them out also.They just have a round ring that looks like a bracelet with circular holes in it that holds the ball bearings in place.Then the two halves have about a 1/4" wide groove that the ball bearing set in.The combination of the groove wallowing out and the balls wearing down is what causes them to separate because that is really all that hold them together.
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Old 06-28-2008, 11:07 PM   #12
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Actually now that I think of it I have one on the shelf at the shop I will snap a pic and put it up for ya Jerry.It is pretty interesting as to how they press them together with out damaging the ball bearings because if the bearings and the groove they sit in are good they will not come apart that easy.
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Old 06-30-2008, 06:13 PM   #13
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No, I never have but yeah I'd like to see one or a photo of one some day. What made it come apart? Did he try to drive on it without the outer stub shaft installed?
Nope, just wheeled the hell out of them for about a year on Walker Evans and 37" Comp Claws. That's a heavy heavy load for a 1/4 ton unit bearing to handle. Funny enough it was really the other side we thought was bad. It came off fine.

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Actually now that I think of it I have one on the shelf at the shop I will snap a pic and put it up for ya Jerry.It is pretty interesting as to how they press them together with out damaging the ball bearings because if the bearings and the groove they sit in are good they will not come apart that easy.
You are right. It was interesting to see how they are built and go together.

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