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Registered
Join Date: Jul 2003
Location: Albany,NY area
Posts: 415
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Rear Wheel Bearing Noise?
Just had the 2 rear wheeel bearings replaced ( due to classic symptoms in the right rear).
One the way home, I made a fast right and a "hum" started and got worse as I drove. Sounds like it's from the same source as the mettalic rumble that prompted the change. Later on another drive, the noise got noticeable again after 10-15 miles and built up until I could feel it in the sterring wheel. Definitely some kind of resonance that you can turn on by turning the wheel left and a different sound that the worn bearing. I'm bringing it back and I'm sure my shop will make it right, but I'm curious. My guess is that it's a bad or misinstalled bearing thats causing something to bind and bind more as it gets warm. Appreciate inputs. |
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09-29-2006, 04:53 AM
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Back in New England!
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They may not have packed the bearings completely, or used an improper grease. Was the maintenance done at a Porsche dealership or at a local mechanic?
Are you noticing the problem at slow speeds, or does it only develop after a hard turn or highway driving?
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'78 RoW 911SC Targa converted to a '86-like 3.2L Cab (w/930 body & No A/C) Custom subframe integrated into AutoPower Half Cage, Euro Ride Height, Turbo Tie-Rods, WeltMeister Bump Steer Kit, Sway-Away 26mm Rear Torsion Bars, Koni Adjustable Shocks and Strut Inserts, Two Bar Rennline Strut Tower Brace, Poly Motor Mounts, WEVO Trans Mounts, Modified Conical K&N Intake, ER PB A-arm bushings and 17" CUP3 Wheels. Steve Wong Chip! |
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09-29-2006, 05:41 AM
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Join Date: Jul 2001
Location: Hamden, CT, USA
Posts: 446
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The bearings are sealed. They could have damaged one during installation.
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Tim Lynn 84 911 Carrera PCA E Stock #278 |
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09-29-2006, 05:50 AM
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Join Date: Sep 2004
Location: London UK
Posts: 690
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could be CV joints - I had mine apart recently and they were in a right state.
They might also just need re-packing and new boots
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'89 3.2/3.6 coupe |
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09-29-2006, 05:52 AM
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Location: Albany,NY area
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Bearings are new, installed by an indpendant Pcar specialty shop.
Didn't notice the problem until picking up the car from the shop, 7-8 miles of highway, getting off and making one of my favorite 90deg right turns. I didn't notice at slow speeds before the car was warm, although my wife said she heard it from the start, it just wasn't as loud. This was on a separate drive. CVs were repacked 3-5 K ago when the engine was out. |
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09-29-2006, 06:09 AM
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Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,708
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Quote:
It is possible that the shop damaged the bearing while installing. If so, I'd have both redone. One cannot install the bearings by pushing or pulling, beating in any way, on the center race. ONLY the outer race can be used. If the hub is not frozen when inserted, it can push the bearing apart. If this happens, the bearing shouldn't be used. Likewise on the bearing when installing in the arm; freeze bearing, heat arm. Get this wrong, or do it in a hurry, and problems can develop. |
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09-29-2006, 06:14 AM
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Join Date: Jul 2003
Location: Albany,NY area
Posts: 415
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Just to close the loop.
Turned out to be a sticky front caliper. My shop cleaned it up, now everything is fine. |
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10-03-2006, 04:04 PM
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1978 Porsche 911 3.2L
