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Author
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Topic: Metallic Grinding Noise
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Velocity0
Journeyman Posts: 86
From: Burnaby, BC Canada
Registered: Apr 2001
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posted 06-06-2001 01:26 AM
   
Hey there.I have a Metallic Grinding noise that is consistant with the vehicle speed coming from the Mid to rear area of my car. It only happens during accelration or when there is more than 1 person in the car..Basically when the rear of the car goes down. Like weight transfer. I thought it was wear in the universal joints, so I changed them but it is still there. Could it be the wheel bearings? Has this noise ever happened to anyone else? Thanks,.
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steve'66
Gearhead Posts: 2511
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-06-2001 10:14 AM
Does your driveshaft have rub marks on it? Could be a broken rear spring, or rear wheel bearings. Does it have drum brakes in the rear? What year/model car is it?SteveW
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Velocity0
Journeyman Posts: 86
From: Burnaby, BC Canada
Registered: Apr 2001
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posted 06-06-2001 12:38 PM
It's a 1980 Hatchback.
Drum Brakes in the rear, yes.Someone suggested that it could be the wheel bearings..BUt wouldn't they grind all the time and not just when their is extra weight at the back? No my driveshaft doesn't have rub marks on it.
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Velocity0
Journeyman Posts: 86
From: Burnaby, BC Canada
Registered: Apr 2001
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posted 06-06-2001 12:40 PM
I was thinking last night.....
Could it be possible that the yoke on the driveshaft is rubbing against the transmission?
That could acount for the weight transfer as the driveshaft would move into the transmission more when the car is lower in the rear.
I don't know how this could happen unless the engine was moved back an inch or so.
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Gearhead
Gearhead Posts: 960
From: Look up... waaaaay up!! No, no, no... not that far.
Registered: Mar 2000
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posted 06-06-2001 01:12 PM
One thing that you might want to check is the counterweight attached to the differential. I had a grinding noise coming from my first 79 5.0 at one point and it turned out that the small metal brackets had broken and that allowed the counterweight to move a bit and come in contact with the U-joint/driveshaft. I fabricated new brackets in about 5 minutes and the problem was solved.Just something else to check. ------------------
Cheers,
Ian
M&M Member #395
-------------------
'79 Mustang Indy 500 Pace Car
Ian's Pace Car Website
Vancouver Island Mustang Association Website
Indy Pace Car Registry of Mustangs Official Website "If you get to thinking you are someone of some importance and influence, just try ordering another persons dog around." - Author Unknown
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steve'66
Gearhead Posts: 2511
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-06-2001 01:53 PM
The only exposed moving metal parts in the rear of the car are the driveshaft and brake drums. Loose wheel bearings could let the drums scrape the backing plates, but it would probably be worse around turns.  SteveW
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lyle29464
Gearhead Posts: 233
From: Mt. Pleasant S.C. C. S. A.
Registered: Mar 2000
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posted 06-06-2001 05:29 PM
If you apply a litle park brake while moving forward and backward it might help you locate it.
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Velocity0
Journeyman Posts: 86
From: Burnaby, BC Canada
Registered: Apr 2001
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posted 06-07-2001 03:35 AM
well...Problem solved
I took 2 hours out of my day and went over the Drivetrain completely thoroughly.
It turns out, my Parking brake cables were a little loose (HAving not been adjusted in quite sometime.) and they were rubbing against the driveshaft. I had taken the shaft out and I noticed a little bit of rust on each of the cables.Thanks for the help.
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steve'66
Gearhead Posts: 2511
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-07-2001 11:33 AM
Very  Had to be something simple.  SteveW
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