Welcome to the North American Subaru Impreza Owners Club Tuesday May 22, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 01-16-2018, 07:38 PM   #1
corona672
Scooby Newbie
 
Member#: 262902
Join Date: Nov 2010
Location: Arlington, VA
Vehicle:
'04 WRX Hybrid
It's a wrap!

Default STi Wheel Bearing Clearance

I just upgraded from the press in style bearings to 05-07 STi hub assemblies. I ordered new assemblies and noticed radial play in the bearing.

Is there a tolerance on these bearings for radial clearance? Not the best setup - but I measured with a feeler gauge approx .008 inches of total deflection.

I took a video - note the bearing was at about 40 degrees F here and the measurement was done at room temp.



The only thing I can think of that would have damaged the bearing is wheel stud install. I was very cautious to gently tap out the old studs by putting the bearing in a jig of wooden blocks under the hub face so less force would be transitioned to the bearing itself. I didn't notice if there was play before I did that but when the old studs were out and before the new ones went in I became nervous studying the play. Anyone have a new bearing they can refer to, or have a similar experience? Bearing spins smooth as silk and sounds fine.
* Registered users of the site do not see these ads.
corona672 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-16-2018, 08:39 PM   #2
Elbert Bass
Scooby Specialist
 
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

Default

If you were hammering on the hub without the axle bolted in you could have caused the inboard inner bearing race to move a bit. That would explain the freeplay. Install the axle, torque the axle nut and you should be fine.
Elbert Bass is offline   Reply With Quote
Old 01-16-2018, 08:46 PM   #3
2slofouru
NASIOC Supporter
 
Member#: 90539
Join Date: Jul 2005
Chapter/Region: South East
Location: Lake Charles
Vehicle:
My BOV goes
COVFEFE!

Default

If it's designed anything like the original, there will be some play until you torque the nut, because of the two separate inner races and bearings.
2slofouru is offline   Reply With Quote
Old 01-16-2018, 09:36 PM   #4
corona672
Scooby Newbie
 
Member#: 262902
Join Date: Nov 2010
Location: Arlington, VA
Vehicle:
'04 WRX Hybrid
It's a wrap!

Default

Quote:
Originally Posted by Elbert Bass View Post
If you were hammering on the hub without the axle bolted in you could have caused the inboard inner bearing race to move a bit.
Hammering sounds so cruel, I prefer 'encouraged' . The idea was by fixing the hub while encouraging the stud to come out, it would reduce any moment on the bearing itself.

Quote:
Originally Posted by 2slofouru View Post
If it's designed anything like the original
Yes its the OEM bearing from an 07 STi. Is that a NTN bearing? I might be able to dig up some clearance charts from them.

I agree I'd like to try and torque them down and verify - I'm going to need some more parts first.
corona672 is offline   Reply With Quote
Old 01-16-2018, 10:23 PM   #5
2slofouru
NASIOC Supporter
 
Member#: 90539
Join Date: Jul 2005
Chapter/Region: South East
Location: Lake Charles
Vehicle:
My BOV goes
COVFEFE!

Default

I meant the original press in bearing. They have two center races and one large outer. When they aren't installed/torque'd between the axle and nut, they have some play because the two inner races can move a little. When you torque the nut, it presses the center races together and drops the clearance way down. This is why it's important to use a good torque wrench and the correct spec.

The style you are installing should also have two separate inner races. They shouldn't separate if there is an inner hub pressed between them though, unless you hit it pretty hard. Using something to support the rear of the hub is the correct way to do it.

Sometimes the inner races of the previous style bearings can pop a little loose or even come out if you jar them. It's easy to snap them back in by hand though.
2slofouru is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 09:36 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.