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Old 12-03-2010, 06:48 PM   #1
p220guy
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Default Stupid wheel bearings

Hey guys just wanted to share this story.

About 700 miles ago I had my front left wheel bearing replaced and alignment and they told me to come back in 500 miles because they wanted to double check what i thought was a small axle seal leak.

Well after 700 miles I brought it back an indeed do have a small axle seal leak.
BUT THE WHEEL BEARING IS SHOT!!!! what the hell

Should I be concerned about my car???? or did I just get a bum bearing??

What happened to scoobies being reliable grrr

Alright I pitched my bitch. Have a good weekend guys.

p220guy
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Old 12-03-2010, 06:49 PM   #2
Uncle Scotty
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install issue....improper torque and/or procedure most likely
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Old 12-03-2010, 06:54 PM   #3
22B05STI
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Quote:
Originally Posted by Uncle Scotty View Post
install issue....improper torque and/or procedure most likely
Absolutely agree! It will be an install Issue, they probably torqued the half shaft nut after setting the car on the ground which is a definate no or Brenelled the bearing by improper install. I would say it is fairly unlikely to just have a bad bearing!
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Old 12-03-2010, 07:04 PM   #4
PlasticFoamMan
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Exactly why there's a press in my basement now
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Old 12-04-2010, 03:50 AM   #5
p220guy
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Fair enough but I mean how incorrectly can a wheel bearing install go. This shop has been great to me for 9 years now.

Are subaru's anal cars? Iv seen plenty of impacted axle nuts over the years on cars from moter swaped eg/ek honda to gm fbodys...

I'm just saying I find it hard to believe an "over torqued" axle nut would cause wheel bearing failure in under 1000 miles.

Also I don't mean to disrespect anyone (coughscottycough) but i have been in the performance car game for a decade. Although new to subies, I am just trying to learn so please correct me if I am mistaken.
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Old 12-04-2010, 04:12 AM   #6
Uncle Scotty
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subarus are different.....no really

if ya dont know their quirks...and most dont....ya end up with sometimes:


and it could have been several modes of failure, really

I know that some dont know about the snap ring that holds the bearing on the inboard side and they try to press it with it in and bend the knuckle before they realize what is up...or lotsa things....


and the hub may be bad and the knuckle may be bad
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Old 12-09-2010, 02:22 PM   #7
p220guy
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UPDATE!!!!!

So it turns out that the hub was oblonged insted of perfectly round... any idea what can cause that???? (yes... I am looking at you scotty)

I think my wrx thinks it is a VW... I will not stand for this... grr
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Old 12-09-2010, 09:44 PM   #8
Web Foot STi
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Quote:
Originally Posted by p220guy View Post
UPDATE!!!!!

So it turns out that the hub was oblonged insted of perfectly round... any idea what can cause that???? (yes... I am looking at you scotty)

I think my wrx thinks it is a VW... I will not stand for this... grr
How dead was the bearing when you changed it out the first time? A really bad bearing can tear things up. Was the cup, or rollers blue/black?
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Old 12-09-2010, 11:19 PM   #9
p220guy
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I personally didn't do it the first time, I had my shop do it. Iv been to busy and its too cold to save like 100 bux on labor.
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Old 12-10-2010, 09:55 AM   #10
p220guy
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Now that you mention it... the bearing that lasted 700 miles my mechanic said there was little chunks missing from the bearing.
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Old 12-10-2010, 02:22 PM   #11
Web Foot STi
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That could be spalling of the cup and/or rollers, or the rollers breaking up (There is a difference). This type of damage generally take a long time, or sever overloads. If the hub had been damaged with the first bearing failure there could have been "slop" in the bearing lash as a mis adjusted bearing could do this too. Running with the incorrect lash is hard on bearings. There is no lash adjustment on our cars. It is all set with the machining of the parts and their tolerances and locked in place with the proper torque on the axle nut.

If it was hub wear/damage, then shame on the shop for not mic'ing the hub to check for the out of round condition and then telling you that you had to spring for a new hub too.

F.YI: Earlier in my career I tested truck wheel hubs. We ran sever overloads to get the parts to fail in a reasonable length of time. (We also had a bogy for infinite life when we gave up, but we did want to know where and how things broke up if it didn't take more than ~ 3 months.)

I've changed out thousands of busted up wheel bearings. To give you and idea of the volume we had a 55 gal drum in the lab that every few months we would dump in the steel recycling bin. The testing was so sever that some bearings would not last overnight while some would last a week. Properly adjusted bearing life is specified by the B10, or L10 life. The number of cycles that 10% of the product will fail. Since it is statistics you can get "lucky" and get a L1 part, and guess what happens? If anyone wants to know more about the subject search "Weibull". It can be an interesting subject, but doing the graphs manually is a pain.

Hope this explains some of the types of failures possible.

Last edited by Web Foot STi; 12-10-2010 at 06:17 PM. Reason: typos
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Old 12-10-2010, 06:09 PM   #12
p220guy
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Damn dude... thanks you are the man... I just hope with my new hub and bearings I will finally be able to drive and enjoy my car without something breaking.

I swear sometime I think its a vw...

Thanks man
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Old 12-10-2010, 06:17 PM   #13
Web Foot STi
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Quote:
Originally Posted by p220guy View Post
Damn dude... thanks you are the man... I just hope with my new hub and bearings I will finally be able to drive and enjoy my car without something breaking.

I swear sometime I think its a vw...

Thanks man
Just a dumb engineer...
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Old 12-11-2010, 01:58 AM   #14
Buffman
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I think that's one thing i like about my wife's cavalier. Bearing and Hub one entire assembly. No removing knuckle, no pressing, etc. Remove brakes, remove the four bolts (PB blaster and heat +1!!), knock old unit out (obvious fronts require you to remove axle nut), clean area up, install new, loctite and torque bolts, and reassemble

I had to do the rear bearing on my 92 twice. The little spring that goes around the seal got sucked into the bearing and after 15,000 it had enough, and got really loud . I think I had two hours into taking everything off, pressing out and in, and reassembly.
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Old 12-11-2010, 02:03 AM   #15
Web Foot STi
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The '05+ STi has the same type of cartridge hub/bearing assembly up front. The rear is still discreet bearing cups, cones, and seals. I missed it by one year...
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