Landseer

Yep, earlier ABS had more finer teeth. Looks right.

Dean_Fuller

Just to update for further reference...it was the rear right wheel bearing. After jacking up the rear and spinning the wheel with the half shaft removed it was obvious the bearing was bad. A Very metallic sound.

Landseer

Thanks for bringing this back up. I think I might be experiencing this on the left side. Gets bad when making a sweeping right. What do you think?

Dean_Fuller

Could be...I have the tool to R&R wheel bearing ON the car. Saves alignment and machine shop to press out and back in. Its HEAVY so shipping is pricey but still cheaper than not using it.

karl ruiter

Hi Dean
What was your source for the tool?

Bill Ball

Dean:

Thanks for reporting back. It's amazing how you can drive around on the bearings when you see how bad they behave when you spin the hub. The rears don't seem to have a classic wheel bearing failure pattern. I used to look for a growling noise that got louder in turns and got worse over several weeks, but mine failed rather suddenly one day without any noticeable warning. Here's a completely dry one on another local car that made almost no noise while driving.

Dean_Fuller

www.sirtools.com

Dean_Fuller

Bill,
You are correct. It doesn't really sound like a typical bearing failure. When it started making noise it was quick. Once I removed the half shaft for boot replacement , repacking I spun the hub...it sounded exactly like your video.

I would venture to guess there are plenty folks driving on bad rear bearings and don't know it.

Mike B

Nice tool, would love to have something like that...just in case. I'm sure ebay is not an accurate pricing guide...for example.

http://cgi.ebay.com/ebaymotors/Sir-T...motiveQ5fTools

Thanks for the update Dean. Far too many times I've read countless old posts trying to diagnose an issue, that others have had, with no update.

dr bob

Couple points--

The rear bearing is a double-row angular ball bearing that relies on a bit of preload. Contrast with the angled roller bearings on the front that can't stand preload for very long. Anyway, with the stub shaft out of the bearing some of the preload is lost, so spinning it that way may not be definitive.

Karl- I have the full B-90 master kit, usually here in Glendale. It's on it's way to the bay area this weekend for Dave A. to use, due back here in mid July when he's done. You are welcome to use it then if you need it. The one I have has all the slots in the case populated, and is therefore an armload to carry or ship.

For those playing along at home, the Sir Tools fixture makes it relatively easy to swap rear wheel bearings without having to remove the carrier and get the pieces pressed apart or together. Relatively easy. It's still a few hours of fun with the car up on stands and the wheels off. But what 928 owner isn't constantly searching for a reason to get the butt up and the wheels off?

Companion duties (WYAIT's) include rear brakes, CV joint service including replacing the boots. Do both side bearings too, since for most of us the two bearings have seen the same service.

Other tools: Big breaker bar and socket for the axle nut, matching torque wrnec with 336 lbs/ft capability for tightening the axle nut, hefty 10mm Allen driver for the inner drive flange bolts, and a mating torque wrench with about 65 lbs/ft capablity for retightening, plus a BFSRP (large snap ring pliers) for the ring that holds the bearings in the carrier. There are a few more things but nothing exotic.