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Wheel bearing diagnosis
Posted 04 September 2005 - 12:38 PM
Posted 04 September 2005 - 01:23 PM
Posted 04 September 2005 - 02:10 PM
The one thing they dont mention is the seal surface area on the outer c/v , if it is rusted at the seal surface , this can cause water to get into the wheel bearing and cause a failure
hope that helps
Posted 04 September 2005 - 02:30 PM
Posted 04 September 2005 - 02:33 PM
Posted 04 September 2005 - 08:56 PM
Those setups sound much more rugged than just the double ball-bearing. I imagine the Indy cars don't run very many races with the same bearing set, probably one race?
twin angular contact like this, with a plain needle roller as well, older cars had twin tapered rollers
I see your car takes Timken bearing 511023, 38mm bore and 65mm OD. I don't see tolerances for press-fits in their online catalog. I suspect that number is an industry standard, I can find it if I search around or when I get back to work, If you want to measure the hub bore. How deep does this bearing have to be pressed in? Comments I've read make it sound fairly deep. The bearing can really get hot if you're pressing into a deep bore, some people use lube, I usually clean it well and use bearing locker, which seems to lubricate a bit. I put most of my bearings into aluminum, pressing them dry seems to build up shavings in front of them, which gets really tight in a deep press. Should be better with steel, but it could still build up some material.
I've read here you can put a different bearing in the Impreza, maybe from the Legacy? Are those roller maybe? I guess you could take the bearing dimensions from Timken and try to find something better to fit. Next year I'll probably have an uncontrollable urge to repack or replace my wheel bearings at 100k miles.
Posted 04 September 2005 - 09:39 PM
Posted 04 September 2005 - 10:18 PM
Posted 04 September 2005 - 11:14 PM
Posted 05 September 2005 - 08:26 AM
Car: '01 Impreza
Bearing type: Ball Bearing
Timkin #: 511023
Car: '99 Legacy
Bearing type: Double Row Tapered Assy
Timkin #: 513248
Mine lists part#1 and part#2 as 513248, so maybe mine takes two bearings per wheel, but it appears the dimensions are for the assembly of two. If so, I think the Legacy bearings should fit the Impreza. I only have these dimensions, I'd prefer dimensioned drawings catalogs usually have to be more certain. What do you think?
Posted 05 September 2005 - 10:56 AM
Posted 05 September 2005 - 01:22 PM
meaning that they went to ball, away from tapered roller, which is a shame.
This is fascinating stuff, guys. I'll probably never touch a bearing in my life but I'm learning so much. The "essence" of an automobile is that it can move us from A to B. If it can do so with the least rolling resistance it is simply so much more efficient and useful to us. I've always felt that good bearings are the heart of an efficient, useful tool--in this case, a car.
Egads, I'm writing an Ode to a Bearing! Forgive me, but the topic really grabbed my interest.
DAlgie, your comment above intrigues me. Why do you think tapered rollers are better?
Posted 05 September 2005 - 02:19 PM
Posted 05 September 2005 - 02:38 PM
Posted 05 September 2005 - 02:41 PM
Yeah, I would have thought that both cars are the same. See if you can find out what the '01 Legacy uses, wondering if it also is a ball, meaning that they went to ball, away from tapered roller, which is a shame. The dimensions you list there, the Legacy numbers are probably converted back from metric, and are actually the same. Bearings are always full millimeter sizes, and are almost always metric. Anyone have any info on the tapered rollers failing?
Subaru has also authorized the
installation of a taper roller-type
bearing, part number
28016AA030, as the replacement
part on the applicable Impreza
and Forester models. This taper
bearing is the same bearing that
is applicable to 1999 model year
and prior Legacy models.
If you have diagnosed a failed
rear wheel bearing, repair it with
the new procedure and check the
condition of the remaining side.
Replace only if needed.
The new genuine Subaru rear
wheel bearings are not to be
packed with grease of any kind.
The bearing is ready to install
out of the box.
quote from endwrench
Posted 05 September 2005 - 03:03 PM
How big are the rollers in Subie bearings anway (length, end diameters)?
I agree the "scuffing" of an angular contact ball sounds bad. Is there some benefit (or logic) to designing a bearing with angular contact? What would be the alternative--parallel contact faces?
Thanks again for indulging me guys.
Posted 05 September 2005 - 03:17 PM
Posted 05 September 2005 - 04:06 PM
I wonder about sourcing that bearing with the industry numbers, you can usually specify a few kinds of grease or oil.
I suspect the bearings are slightly undersize on purpose. A lot of parts I order are slightly under or over nominal size for press-fit or slip-fit. Perhaps Subaru wanted to use the same hubs with slightly less interference fit? Or the bearing makers recognized a need and made an adjusted fit bearing?
Oddly, my Landcruiser uses a metric and an inch tapered bearing opposing each other in the same hub!
Posted 06 September 2005 - 01:13 AM
It also allows it to deal with axial forces. Like when cornering.
Posted 06 September 2005 - 02:01 AM
Posted 06 September 2005 - 07:15 AM
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