Hi,
I posted thread previously about wheel bearing. There is a humming noise comming brok back side while my 94 Tercel is in motion. I changed both rear wheel bearings, apply proper torque to fix the nuts etc. Still noise comes. When my car is moving fast I get more noise. Noise doesn't go if car is in motion and I put it in Nutural Gear. Any suggestion What I should look to eleminate this problem.....
Are you sure it's the rear wheels? It's sometimes hard to hear which wheel it's coming from.
Does the noise change when you touch the brakes? (If so it might be loose brake shoes/pads).
Does the noise get louder/softer when you swerve left or right? That can sometimes help locate which wheel it is.
You can try jacking up each of the 4 wheels, one at a time, and spinning them by hand, feeling for which one makes the noise, or feels loose, or rough.
Or, jack up one front wheel, put blocks in front of the rear wheels, start the engine, put the car in gear (so that the jacked-up front wheel is spinning) and listen for noise. (Make sure you have a few feet in front of the car, in case it falls off the jack, and don't ever try this if you have a limited slip differential.
The noise come from the back side. It increases when I accellerate. It starts once I go beyond 20Km/H speed. I Jacked up each wheel as suggested by NickR. There is no noise from front wheels. When I rotate rear wheels, I hear noise and it is different on both side. Actually I did this before changing rear wheel bearings last week and as this noise was coming I thought it is bearings and I changed them. But still noise is there.
One thing I noticed while fixing wheels last week, my drums are rusted and when I put new bearing and fixed the drum and then rotate them with hand to check whether it is too tight etc, I heared a noise (that is differnt than humming though). Is it possible that this noise gets louder when wheels are in speed?
Today morning I went to dealer for road test and he told it is rear wheel bearings. But I don't buy this as I changed both of them just last week...
NickR, when I apply break and car gets slow the noise changes but it gets same as when break is not applied and speed is same.
Jack up the front and support it on stands or blocks. Start the car and put in gear. Accellerate and see if noise is present. Have you checked the transmission oil level?
You can get road noise with poor tires, but that wouldnt explain the noise spining them in the air. So when you spun them in the air, was your brake dragging?
I've double checked the torque on the hub nuts. I've fixed again and still Noise is there.
Sorry for the stupid question, but how can I check whether the break drum is rubbing against the back plate?
Quote:
Originally Posted by NickR
Damned if I can figure it out.
I would double-check the torque on the hub nuts first. If that checks out I would try to see if the brake drum is rubbing against the back plate??
How do you check if the brake drum is rubbing against the back plate? Remove wheel, spin the drum, listen, feel the back plate to see if you can feel any vibration, see if there is at least a little clearance between the drum and the backplate. You could also remove the drum, spin the hub, and see if the noise is still there. Look for wear on the back plate.
"brake dragging" means "binding brakes", i.e the brake being on even when you are not pressing the pedal. Again, jack up the wheel and try to feel if the wheel spins easily.
I read the thread in that link. From my reading of it, the wheel bearings were bad, so they replaced the whole hub assembly, rather than just the bearings. I have only ever heard of bearings going bad, not the rest of the hub.
You could also remove the drum, spin the hub, and see if the noise is still there.
The hub or spindle is a solid peice of tapered metal that the drum mounts on. It doesnt turn. Bad bearings over time can wear down the hub. It wouldnt really be noticable to the eye, because its tapered, and when it wears it down it is still very smooth, yet smaller in circumference.
However, I doubt this is your problem. If it were smaller in circumferance, the tire would knock around slightly when driving.
I never seem to have a good torque wrench handy, so when I tightened my hub nuts, I tightened them just enough until the drum set on the hub.
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