New Wheel Bearings Bad? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

litteng · 11-30-2009, 10:42 AM

what was the reason for changing the original ones?

i had a wheel that sounded like the bearing was on its way out, and with the car in the air and no load on the wheel it was determined that the noise was coming from the tires, put a new bearing in anyway and the noise was still there

350 lb-ft? i thought the boxster rear axle nuts went to 250?

Lil bastard · 11-30-2009, 01:06 PM

Probability of a bad bearing out of the box - extremely low.

Probability of Two bad bearings out of the box - infinitesimally low.

Sorry, I'm gonna go with Operator Error on this one.

jcb986 · 11-30-2009, 03:52 PM

They replacement bearing may have been an inferior product made in China or South America. I would have went with Porsche or German made one. Sorry, but when it comes to major parts I will go with Porsche, even if it costs more. :dance:

PS: Since you spun the wheel and heard no noise, why did you do it. A bad bearing does not go quite with a spinning wheel in the air. If ain't broke...don't fix it!!!

releese78 · 11-30-2009, 04:10 PM

The bearings were bad to begin with, which is why I did this along with the inner CV joints and boots (inner boots were torn).

The replacement bearings are FAG brand, which is the OEM manufacturer for Porsche, and they are in fact German made. I think my problem is more than likely that I didnt pull the hub in using the inner races as mentioned. Not a very expensive lesson learned, but a time consuming one. Hopefully this thread helps out some fellow bearing changers! Cheers and thanks everyone for the replies.

Quote:

Originally Posted by jcb986

They replacement bearing may have been an inferior product made in China or South America. I would have went with Porsche or German made one. Sorry, but when it comes to major parts I will go with Porsche, even if it costs more. :dance:

PS: Since you spun the wheel and heard no noise, why did you do it. A bad bearing does not go quite with a spinning wheel in the air. If ain't broke...don't fix it!!!

releese78 · 12-22-2009, 02:12 PM

Quick question...

I bought another set of bearings and the SIR tool, and I'll be changing the rears again tomorrow. To be absolutely sure I do it right this time, I wanted to check on two things.

First, these bearings aren't directional are they? The outer rim of one side is a larger groove.

Second, since they are sealed bearings, I don't need to pack any additional grease do i?

Thanks in advance,

brp987 · 12-22-2009, 05:53 PM

page 42-14 bentley says install bearings with numbers facing toward the wheel hub.

The bearings come ready to install.

gregwils · 12-23-2009, 03:57 PM

Here is a thread on the Pelican board. It's actually for older 911's, but the concepts are similar. The post explains how to build a bearing puller similar to sir tools for less than $20 at Home Depot or Lowes. I did mine (911) using the procedure. It was very simple. Hope this helps.

http://forums.pelicanparts.com/porsche-911-technical-forum/179300-rear-wheel-bearing-removal.html

brp987 · 11-30-2009, 04:03 PM

"but hub may have also been pulled in against the outer bearing race"

That will ruin the bearing, and unfortunately I'm speaking from experience having done the same thing. There is a plastic-like piece inside the bearing that holds the balls in position that won't tolerate much loading.