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Re: Repeated Wheel Bearing Failure
Posted by Thor Carlson (more from Thor Carlson) on Mon, 18 Sep 2000 10:03:26
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

> We haver replaced the right front wheel
> bearings on our '90 SPG (135,000 miles) FOUR times in the past year.

Either:

a. Bad or wrong bearings

or,

2. Improper installation.

Those wheel bearings should be good for 100/150k miles...
==================
Message from volvop1900no39sdcx6spamx782hotmail.com
my best thoughts so far center on the possiblity of the engine/transmission 
assembly being slightly off center or poorly mounted.  (perhaps a bad 
trans/engine mount-- that is hard to see the condition of-- is letting the 
assembly lean on corners, pressing the shaft out of place ??? or something 
similar ?)

ill post if i learn something difinitive and hope you might do the same

thanks

jay
==================
Message from Terry Markovich <tmarkovno39sdcx6spamx782bellatlantic.net>
Sufficient torque must be used when installing the wheel bearing.  I did =
the same thing myself when I replaced the bearing TWICE on my 1990 9000, =
and they only lasted a few months.  Then I looked up the specs and found =
I was not even coming close to the correct spec.  I assume that =
under-torquing allows the bearing to come apart eventually.  The third =
bearing was torqued to specs and is still working well after 200K miles.

Terry Markovich
1995 900SE
1999 9-5 wagon
==================
Message from JoelSchnno39sdcx6spamx782cs.com
I remember several (15+) years ago Dodge Omnis and Plymouth Horizons
experienced frequent and repeated wheel bearing failure. The cause was
traced to a poor or missing battery ground connection somewhere. Evidently,
electricity was arcing through the bearing and creating tiny spot welds
which were immediately sheared when the car was moving. This destroyed the
bearing races and rollers (balls?). Check the bad bearings for signs of
this.
==================
Message from Larry West <viggenno39sdcx6spamx782compuserve.com>
Improper torque of the hub nut upon reassembly. The hub nut needs to 
be torqued to 220 foot-lbs (or so, don't have the exact figure 
handy). Failure to do this means insufficient bearing preload, and no 
real support for the bearing. This figure should not be guessed at, 
but it should be read with a proper torque wrench (i.e. wailing on it 
with an impact gun IS NOT sufficient)

Also, Saab recommends that the nut be replaced EVERY TIME it is 
removed. If that is not done, then it's possible that the CV will 
loosen up inside the bearing.
-- 
Larry West
NJ Saab Owner's Club
==================
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