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Topic: Scrapping noice

in Forum: C3 Engines


Scrapping noice

Posted: 8/22/23 1:09pm Message 1 of 13
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Danbury, CT - USA
Joined: 8/22/2023
Posts: 7
Vette(s): 1978 Silver Anniversary

Sometimes when I accelorate from a standing position, a scrapping noice come from the drivers side front. Anyone experience this? Possible causes?




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Re: Scrapping noice

Posted: 8/22/23 4:55pm Message 2 of 13
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Burke, VT - USA
Joined: 1/23/2002
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Maybe a brake caliper that hasn't released?




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Re: Scrapping noice

Posted: 8/22/23 6:45pm Message 3 of 13
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Danbury, CT - USA
Joined: 8/22/2023
Posts: 7
Vette(s): 1978 Silver Anniversary

Thanks but that isn't it. Brakes have been check and and are good.




Re: Scrapping noice

Posted: 8/22/23 7:04pm Message 4 of 13
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Cana, VA - USA
Joined: 7/3/2016
Posts: 375
Vette(s): 1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box

Is the torque from acceleration twisting the engine enough so a pulley is rubbing?

I had this happen on my '75 where the power steering pump pulley was rubbing on the cross-frame under the pulley.

 




   

Re: Scrapping noice

Posted: 8/22/23 7:21pm Message 5 of 13
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Danbury, CT - USA
Joined: 8/22/2023
Posts: 7
Vette(s): 1978 Silver Anniversary

Interesting. How did you confirm thats what it was?




Re: Scrapping noice

Posted: 8/22/23 8:55pm Message 6 of 13
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Cana, VA - USA
Joined: 7/3/2016
Posts: 375
Vette(s): 1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box

I could see some shinny on the outside of the pulley.  The pulley sits in a bit of a well in that part of the cross-frame, and it is quite close to begin with.

We put a shorter belt on the PS pump, which then caused the alternator belt to be too close to the shaft of the PS pump, so we changed the pulley on the alternator to a double pulley, and moved the belt to the outer part of the pulley so the belt ran in front of the PS pulley (at least that is the way I think I remember it. . .).




   

Re: Scrapping noice

Posted: 8/23/23 5:12am Message 7 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Fan hitting the shroud...




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Re: Scrapping noice

Posted: 8/23/23 5:16am Message 8 of 13
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Danbury, CT - USA
Joined: 8/22/2023
Posts: 7
Vette(s): 1978 Silver Anniversary

I will definitely check that out and thanks. 




Re: Scrapping noice

Posted: 8/23/23 5:17am Message 9 of 13
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Danbury, CT - USA
Joined: 8/22/2023
Posts: 7
Vette(s): 1978 Silver Anniversary

Thanks but thats not it. I know that sound from experience unfortunately....lol




Re: Scrapping noice

Posted: 8/23/23 7:22am Message 10 of 13
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Equinunk, PA - USA
Joined: 10/31/2007
Posts: 2465
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Here's a possibility. Check the fan mounting hub, and pulley to the waterpump. It may be loose. Mine runs very close to the waterpump. The torque on it may be enough to flex it to rub.




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