Date: Wed, 17 Nov 1999 17:06:17 -0500
From: Chris Ault <aultnopsamelnetworks.com>
Subject: Re: 94 900S and rear wheel bearings


James H. E. Maugham wrote: > > Johan Karl Larsen wrote: > > > > Is it possible to ajust the rear wheel bearings on a 94 Saab 900S. It > > looks to me that the bearings are tightened to hard. If I jack up the > > card and give the lh wheel a hard spin it will only rotate one, at most > > two times. The rh wheel does not have this problem, it just keeps on > > spinning with 10-20 times less friction. > > The rear wheel bearings are almost exactly the same as the front wheel > bearings in a RWD car and are adjustable. I don't have a 900 and I don't > know what the proper torque is for the bearings but someone on the list > should be able to help. > > Your description would make me change the bearings were it my car. > > Regards, > > James the Elder No, the bearings are not "adjustable", they're not even serviceable. Pop the sealed unit off, look at the bearings, and to put it back on you have to go and buy a new one. What you are noticing on your two wheels is a difference in the gap between the brake pads and the rotors. Typically this gap is very small and the wheel will only spin a bit freely (note your LH wheel). On the other side, the pads are too far from the rotor, and those brakes are probably not providing enough stopping power. Get the brake adjusted or the pads replaced. The self-adjusting mechanism may also be out. As an exercise, remove the pads THEN give the wheels a spin. There ought to be no difference in free-spin now. Unless the bearings are making a grinding sound (which changes in volume on corners) the bearings are fine and I wouldn't spend the $$ or time changing them. FYI, the proper torque is in the neighbourhood of 200 foot-pounds. Basically, as tight as you can get them. Then a bit more. To loosen that nut, I use a 4-foot pipe fitted over my 18" breaker bar, give it all I can and the nut will finally pop. This, of course, is with the wheel on the car, and the car on the ground. Do this with the car on jack stands and you'll roll the car off the stands. -chris

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