Grinding/Roaring Sound from Left Side front

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  #1  
Old 05-12-10, 02:37 PM
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Grinding/Roaring Sound from Left Side front

1996 Geo Prizm 1.6(?) 5 Speed manual trans 112K miles, has a grinding/roaring sound emanating from the front left area. Pitch of the sound varies with speed of the car, not with speed of the motor, Changed the hub/bearings on both front wheels several months ago and it did not solve the problem. Sound does not correlate to vibration or any unusual sensation in the car; in other words, it drives fine, but it has this nasty, loud sound.

Any ideas?

Thanks.
 
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  #2  
Old 05-12-10, 03:29 PM
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I would look at the CV joint and check that the brakes are not dragging. I take it there is no noise when the car is sitting still?
 
  #3  
Old 05-12-10, 03:53 PM
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You know, I'm not exactly sure that there is NO noise when the car is still. The noise is very apparent when it is moving, but there is a lot of noise even when the car is still. It is definitely not in the motor, because the noise is unaffected by revving the motor in neutral while the car is moving.

I checked the brakes and they are fine. The sound is much like an engine at high RPMs, although the engine is not the source.

I will delve into it more to confirm whether it goes away when it is not in motion.
 
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Old 05-13-10, 05:34 AM
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OK, I checked it out. While the car makes a myriad of noises, the one in question is only apparent when in motion. Sounds almost exactly like a hub/bearing, but that was replaced and the problem persists.

There is no "clunking" sound on turns so I'm thinking it's not CV joints and the issue has been consistent for nearly a year.

I've heard "Trans-axle" as a suggestion...ideas?
 
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Old 05-13-10, 08:35 AM
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don't know about the geo.
but a ford focus/escort has an intermediate drive axle with a 'support bearing' that creates a 'hub bearing' type noise.
 
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Old 05-14-10, 05:46 AM
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Not certain if Geo has it too, but I looked in a repair manual I had for a Camry I used to own. It has exactly what you describe.

It looks like it's about the same amount of work as replacing a CV half shaft. Does that seem right?
 
  #7  
Old 05-14-10, 07:27 AM
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I imagine what you have is the same as the Geo Prism with the 1.8. That has just half shafts - a short one on the drivers side and the longer one on the passenger side. They go straight from the trans casing to the hub.
 
  #8  
Old 05-14-10, 07:30 AM
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yes,remove c/v shaft 1st.
then a couple of bolts that hold the support bearing bracket.
may need access to a press, or some thing. to remove & install bearing.
use care if bearing has a protective dust shield.
 
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