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Car Forum / BMW Cars / February 2005wheel bearings
After reading responses to a previous post, the concensus seems to be that my hummmming sound may be coming from a wheel bearing going south. I jacked up one corner of the car at a time and spun the wheels by hand and could not percieve any problem. Is there any way to really check them short of dissassembly? On disassembly I'm assuming that if this is the problem I'll see pretty dry bearings and maybe some discoloration from heat build up? Any insight would be appreciated, Chris 92E36 w/80k miles Generally speaking, by the time a wheel bearing can be found with no load, it is toast. It will make noise under load for a very long time before you can detect a problem wtihout a load. When I have diagnosed a bad wheel bearing on any of the cars that I have ever owned, I could tell which corner the noise was coming from, and taking out one bearing always did the trick. It is common that one can't tell a bad wheel bearing until he has a good one in his hand, then the difference can be felt. > After reading responses to a previous post, the concensus seems to be that > my hummmming sound may be coming from a wheel bearing going south. I [quoted text clipped - 9 lines] > Chris > 92E36 w/80k miles > It is common that one can't tell a bad wheel bearing until he has a good > one in his hand, then the difference can be felt. That's a very good point. Unless you are a particularly talented tech it's very hard. I should have mention that in my prior post about feeling "very carefully". Sorry if this is off the main topic, but I am suspecting that my rear wheel bearing is failing. Its a E46 330D. Let me explain my problem. When driving at 5-20mph I can hear a ticking/rubbing noise from rear, not a typical droning sound More noticable usually when turning and when accelerating/braking lightly Noise hardly occurs when coasting/free wheeling Rear brakes recently changed and test OK on brake dyno, no binding, even, good force etc Otherwise car drives fine, but the noise is pretty embarrassing Any ideas/help much appreciated MC > Generally speaking, by the time a wheel bearing can be found with no load, > it is toast. It will make noise under load for a very long time before you [quoted text clipped - 21 lines] >> Chris >> 92E36 w/80k miles > Sorry if this is off the main topic, but I am suspecting that my rear wheel > bearing is failing. [quoted text clipped - 7 lines] > good force etc > Otherwise car drives fine, but the noise is pretty embarrassing I have been reading your other post about brake noise. I suggested that you ride the brake or pull hte parking brake handle up a few clicks to see if you can alter the symptoms. But, after reading this post, I suspect you have troubles with a universal joint, of which there are several. The rear axle has 4, two inners that are next to the diff, and two outers that are next to the tires. There are also universal joints, and variations of them, on the driveshaft. I suspect you are hearing a u-joint going bad. You should turn the wheel VERY slowly, and when you feel the slightest "bump" rotate back and forth around that spot. This may help you discern a bearing failure from just a friction stick. > After reading responses to a previous post, the concensus seems to be that > my hummmming sound may be coming from a wheel bearing going south. I [quoted text clipped - 9 lines] > Chris > 92E36 w/80k miles Thanks guys, I'll give it a whirl. Chris > You should turn the wheel VERY slowly, and when you feel the slightest > "bump" rotate back and forth around that spot. This may help you discern a [quoted text clipped - 13 lines] > > Chris > > 92E36 w/80k miles
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