2023513 — 2. Mechanic Costs: $400 to $1000. The exact number depends on which front bearing you like to fix or replace. Here is a detailed breakdown: ... In ...

After the recording session ended, I began driving back toward the highway. As I approached a small service station, I debated stopping to have them throw the car up on the lift and check it, but again, since the rumble remained low and constant, I headed home. Still, to err on the literal side of safety, I stayed in the right lane, turned the flashers on, and drove at 50 mph.

Perhaps the down comforter of soft failures is a bad wheel bearing. Loss of lubrication will cause them to wear, resulting in a rumble that sometimes can be more felt than heard (they may also squeak or squeal), but the failure process is gradual. They’ll get louder as wear and play embrace each other in an ever-widening downward spiral, but you’d have to be an idiot not to hear it and address it, making outright failure rare. Wheel bearings are pretty robust in BMWs. After owning over 70 cars, I’ve only ever seen one wheel bearing that completely self-destructed—a ’67 2000CS I bought came with one that had destroyed the stub axle. I had to replace the entire front strut assembly.

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And I’m going to have some sort of voodoo ceremony with that bag of Locktite-coated wheel bearing bolts. I can’t tell whether they were bad juju that triggered the problem or a talisman that warded off disaster, but clearly they played some role outside the normal Western vectors of Newtonian mechanics and Cartesian cause and effect. They deserve reverence.

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Note: We have attempted to foresee any possible problem you may have during your cleaning process, and so these instructions may seem complex at first reading. The bearing cleaning process is logical and simple though, and you should have no problem doing this if you can understand our sequential steps.

High precision bearings like Bones® roll their best after about an hour of use in a clean environment (this initial use is called a “break in period”). If you want your bearings at their peak prior to a competition or a race, we highly recommend you break in your bearings, then clean and re-lubricate them and store in a moisture free container until you are ready to use them. When storing your bearings, be sure there is a light coat on the outer races with our Bones Speed Cream®, or a light oil to prevent them from rusting.

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I intentionally jacked up the car at the right front wheel—the one I didn’t think was making the noise—to get a baseline. I grabbed it at 6 and 12, rocked it, verified it was tight, and spun it. As expected, it was quiet.

Why do I have these and why can I lay my hands on them instantly? As Joseph Fiennes said in Shakespeare in Love, “It’s a mystery.”

Rear wheel bearings on old BMWs are incredibly robust. I’ve only ever had one go bad. It was on a Bavaria that my wife and I took on vacation to Martha’s Vineyard in 1986. We were foolishly driving in near-hurricane conditions and got caught in a tidal surge on the road that runs on the barrier beach between Edgartown and Oak Bluffs and drove through water that was deeper than we expected (as I said, foolish). On the drive home, the right rear wheel bearing began rumbling ominously. At the time, I didn’t own the necessary bearing puller, and had to take the car into the late great Beaconwood Motors who had the back page ad of Roundel for a generation. It was one of a handful of repairs the past 40 years I’ve paid someone else to do.

I was driving my 2003 E39 530i up to do some recording in Chelmsford, about 30 miles north of me, when I began to hear and feel a rumbling coming from the left front of the car. It ramped up over several minutes, but then plateaued. If it instead had gotten VERY loud VERY quickly, with obvious metal-smacking-against-metal instead of the more gentle rumble of a worn bearing, that would be the hallmark of loose lug nuts, something you need to pay attention to IMMEDIATELY because you may have only five or ten seconds before the wheel falls off.

Rob’s newest book, The Best of The Hack Mechanic, is available here on Amazon, as are his seven other books. Signed copies can be ordered directly from Rob here.

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I snugged them down, grabbed the wheel at 6 and 12 and verified that the play was gone, spun it and verified that the noise was gone, let the car down off the jack, and tightened them up with a torque wrench.

On newer BMWs, the front wheel bearings are very different than on the 1970s-era cars. About ten years ago, I owned a ’99 E39 528iT wagon that needed struts, control arms, and other front-end work. The E39’s wheel bearings are part of an assembly that includes the front hub—the wheel bearing assembly bolts to the steering knuckle, and the wheel bolts directly to the bearing assembly.

Although bearing rumble is usually quite clear, part of testing for a bad wheel bearing is to jack the car up, set it on stands, grab the wheel at the 6:00 and 12:00 positions, and push-pull it. If you’re hands are at 3:00 and 9:00 instead, play in a front wheel can come from anything in the steering mechanism, but 6-and-12 play pretty much has to be coming from the wheel bearing. In an old-school car with adjustable wheel bearings, if there’s no rumble, you can try adjusting the bearing by pulling the cotter pin and moving the castellated nut by one notch, but play plus rumble equals bad.

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Apr 19, 2019 — I wonder what could cause this repeated failure? Bad alignment? Bad engine mounts? Just really bad luck? Any ideas would be appreciated before I burn through ...

2018718 — Most people don't change wheel bearings as a maintenance item. They wait for them to show signs of failure. You obviously don't want to wait ...

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WARNING! Don’t continue to use bearings that don’t spin freely on your skateboard. If you continue to ride very dirty or un-lubricated bearings, you run the risk of permanently damaging them and/or yourself. Dirt in your bearings will cause pitting of your balls and races, increase friction, cause extra heat, and can eventually cause the bearing to “freeze up” or stop rolling. If this happens to your bearings, the skateboard will stop abruptly, causing you to fall and be injured. So keep them clean, dry and lubricated with Speed Cream.

In contrast, soft failures are things that either give you ample warning before they fail completely, or their failure doesn’t immediately drag the car into the breakdown lane. A textbook soft failure is when the alternator or voltage regulator dies. Even though the battery is no longer being charged, the car can continue to run for some amount of time off the battery alone. On a vintage car like a 2002, you can likely drive for hours during daylight before the battery no longer has enough juice to light the spark plugs. On a late-model car loaded with electric motors and control modules, you might have more like fifteen minutes to an hour—enough to get to a rest area, possibly even a repair shop.

On 1970s-era BMWs, there are inner and outer front wheel bearings with each sitting in its own race that’s pressed into the hub. Since the front discs on these cars sit on the inside surface of the hub, and since the bearings lift out of their races and present their greasy private parts to you when you pull the hub off the spindle, the advice is that, if there’s no documentation on how old the bearings are, to replace both sets of bearings on both sides when the front discs are replaced.

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Bearing No. Tapered bore. Mass (kg). Axial load factor. Abutment and fillet dimensions (mm). Self-aligning Ball Bearings. Bore Diameter : 10〜60mm. Page 2. 207.

I then jacked up the left front wheel and rocked it at 6 and 12. Yup, play. Then I spun it. Yup, rumbly. No doubt—a bad left wheel bearing. I set the car back down and began to walk back to the computer to order the bearings, vividly recalling how much of a pain in the butt they were to replace in the 528iT wagon ten years ago. I wondered if maybe still having those eight spare bearing bolts had made the whole thing a matter of fate.

Rob Siegel has been writing the column The Hack Mechanic for Roundel Magazine for 35 years, and is the author of eight books available on Amazon. He currently owns thirteen cars. Yes, his wife knows about all of them.

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Best solvent for cleaningbearings

And so, just to be certain, to placate my left brain and make sure I didn’t go to all that work unless it was absolutely necessary, I took a 1/2-inch ratchet and a 17mm socket and checked the wheel’s lug nuts.

Congratulations on acquiring a set of Bones ®Bearings, known world-wide as the best brand of skateboard bearings available. All Bones® Bearings are Skate Rated™ to our precision “tolerances” to give you the absolute maximum speed and life possible, not “ABEC” rated like bearings designed to operate in motors or normal machinery. The superb quality of Bones® chromium bearing steel races with their mirror like “super finish,” removable, non-contact rubber shields, high speed, precision molded ball retainers, and Bones Speed Cream® lubricant provide unequalled roll and ease of maintenance. So, carefully install them in your wheels and you’re ready to roll.

My ever-rational left-brain shot back indignantly. “You can’t be serious,” it sneered. “You actually had a wheel fall off that 1600 back in 1984. And you’ve had two close calls, both more recently than you’d like to admit. You know what loose lug nuts sound like, and this wasn’t it. And you learned your lesson. You conditioned yourself to always tighten lug nuts with a torque wrench. It’s not loose lug nuts. Really. It’s not. It can’t be. You are not that careless.”

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To make sure this doesn’t happen again, I’m instituting a new system of checking the lug nuts on all four wheels after I’ve done any work where a car is jacked up for any reason.

Your new Bones® Bearings are the most accurately manufactured part of your skateboard, with clearances and tolerances considerably smaller than 1/1000th of an inch. That means that a single hair is thicker than the clearance between the balls and the races inside the bearing, and a hair will clog it up and slow you down. Because you skateboard outside through dust, sand, water, mud, etc; your bearings will eventually get dirty and/or wet. When they are dirty, you will notice they don’t spin freely when you flick the wheel and you may also notice they are getting noisy. At this point you have two options: clean your bearings or replace them.

I can only speculate what happened. Due to the space constraints in my garage, when I swap winter/summer wheels, I’ll usually pull one end of the car in, jack it up, swap both wheels, snug the lug nuts with a ratchet, let the car down, torque the nuts, air the tires, then pull the car out, flip it around, and do the other side. I must’ve gotten interrupted. Maybe I received a text I felt that I needed to respond to. Maybe my wife was leaving and I walked outside to kiss her goodbye. Maybe I had back pain and took a break. I don’t know.

The Housed Bearing - 2 Bolts known as UCFL205-H-SKF SKF has a shaft diameter of 25 mm and a fixing spacing of 99 mm. This part number is produced in cast ...

Still, to be careful, I pulled into the right lane, slowed down, and listened. The somewhat rapid onset was uncharacteristic of a wheel bearing, but the other symptoms fit. Since I had a recording appointment with a fiddle player, I preferred to keep going, unless of course I couldn’t for safety reasons. The rumbling remained at a constant low level, so I assumed it was a wheel bearing doing the soft failure thing, and continued on.

Then I checked the lug nuts on the right front wheel. While none were loose to the point of being free-spinning, all were substantially below the 88 foot-pound torque spec. The rears were fine.

202185 — If you ignore bad wheel bearings, your wheel could stop working while driving, or you could have issues steering your car. In addition to the ...

In the repair world, there are “hard failures” and “soft failures.” Hard failures are things that instantly drag a car to a stop when they break. Broken ball joint? The worst type of hard failure—the front wheel folds under the fender like a broken ankle and you lose control of the car. Bad fuel pump? Usually a hard failure—it either pumps or it doesn’t. (Okay, there are some exceptions. The one my E39 wigged out on a low tank in hot weather, then recovered. I replaced it anyway.)

When I arrived home, I pulled the nose of the car right into the garage, then hopped on the laptop to get a set of front wheel bearing on order. I looked on FCP Euro, and was more than a little surprised to find that a front wheel bearing kit with German FAG wheel bearing assemblies now cost $312. Of course, I still had that set of bolts, so I could save myself the $4.29 per bolt right there. I mean thirty-four bucks is thirty-four bucks, right? One FAG bearing was $139. I began entertaining replacing just the left bearing, then price-shopping other manufacturers, when I decided that I should be certain that the wheel bearing was really the problem.

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