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scraping noise

Forum: C3 Engines, Driveline and Handling

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scraping noise

Posted: 1/10/07 3:43amMessage 11 of 19
d
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Joined: 3/29/2002
Posts: 17
Vette(s): 1976 White, black interior, all numbers match, Cragars, Headers, clean L48 engine.

Still not resolved.  But still hopeful for the answer.  The wheel bearings looks like the latest idea.

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scraping noise

Posted: 1/10/07 6:27amMessage 12 of 19
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Gloucester, VA - USA
Joined: 1/29/2005
Posts: 1456
Vette(s): 1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition
I know I had noise in the right rear of mine when I got it. It was louder making a turn. Turned out it WAS my bearings.

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scraping noise

Posted: 1/10/07 8:13amMessage 13 of 19
O
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Eastern Oklahoma County, OK - USA
Joined: 1/3/2006
Posts: 1560
Vette(s): 1980 Black L48 T-Tops
After the U-Joint let go at the pumpkin headed to Eureka Springs last Oct, mine has started doing it.  Didn't have the problem before.  I took the driveshaft in to the shop and had it re-balanced and new joints installed, along with a new tailpiece. 

Now on cold start for about 30 sec to 1.5 min or so into the trip straight line or turning, I get the noise and it is timed to wheel rpm irrespective of the engine rpm.

This year, the rear 4 u-joints, e-brake and spring are on the list so we will see if it helps.
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scraping noise

Posted: 1/10/07 10:05amMessage 14 of 19
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Kingston, PA - USA
Joined: 11/26/2003
Posts: 636
Vette(s): 1977 L-82 originally white/buckskin interior. Currently undergoing a frame-off resto. and modifications.YEEHAW!!!
Probably the bearings, when they're cold. After they warm up, the grease takes care of the squeal.
 
Alan
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scraping noise

Posted: 1/10/07 2:41pmMessage 15 of 19
C
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Alice Springs, Australia
Joined: 5/6/2004
Posts: 535
Vette(s): 71 Coupe Black on Black
I'd be really concerned about spindle bearings.  Seeing as the the noise only happens during side load (turning) this makes me think that the spindle is moving in its housing from side to side.
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scraping noise

Posted: 1/17/07 2:39amMessage 16 of 19
C
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New Plymouth, New Zealand
Joined: 3/26/2005
Posts: 232
Vette(s): Silver '81 mostly original C3. Silver interior, bilstiens, big sway bars, headers.
more info... after a bit of playing around the scraping sound is directly related to both (1) right hand turn and (2) load (ie acceleration.) When cold, a right hand turn whilst accelerating is when it is most audible. Button off the gas (still in right hand turn) and it goes much
quieter, almost but not quite gone. Push the gas again
and back it comes. So loading the RH wheel definitely is
a part of it. I'm going for the U Joints... if nothing else they look a whole lot easier to work on than the bearings !
Kiwi Chris

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scraping noise

Posted: 1/17/07 3:39pmMessage 17 of 19
C
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Alice Springs, Australia
Joined: 5/6/2004
Posts: 535
Vette(s): 71 Coupe Black on Black
While you have the axles out put the back wheel on and if you can feel any appreciable play, do your bearings.
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scraping noise

Posted: 1/17/07 4:53pmMessage 18 of 19
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Lawrenceville, GA - USA
Joined: 10/25/2002
Posts: 121
Vette(s): 1968 427 coupe and 96 LT4 six speed Gran Sport clone
How many miles are on the car?  Have you ever re-done the t-arms in any way?  Did the noise start out as a dry squek, perhaps?  If the car has 50 to 60k miles on it, and the bearings were never relubed, could be a serious problem, and the spindle greaser only servicrs the inboard brg., I rebuild t-arms, and lost 3 of the rollers out my outside left brg., what a ride, scared the heck out me, and chewed the crap out of the spindle where the outer bearing is press fitted on, that o.d. on the spindle is 1.375", and mine was 1.125 in just 2 miles after the brg. failed.  My name is Phil, pm me and I'll help you in any way I can-Good Luck!
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scraping noise

Posted: 1/18/07 2:26amMessage 19 of 19
C
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New Plymouth, New Zealand
Joined: 3/26/2005
Posts: 232
Vette(s): Silver '81 mostly original C3. Silver interior, bilstiens, big sway bars, headers.
Hi Phil, have sent you a PM. Chris.
Kiwi Chris

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