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Topic: Scrapping noice

in Forum: C3 Engines


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Scrapping noice (1/13)
 8/22/23 3:09pm
Joe ManueleGold Member
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Danbury, CT - USA

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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 (2/13)
 8/22/23 6:55pm
NorskyLifetime Member
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West Burke, VT - USA

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Maybe a brake caliper that hasn't released?



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Re: Scrapping noice (3/13)
 8/22/23 8:45pm
Joe ManueleGold Member
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Thanks but that isn't it. Brakes have been check and and are good.

Re: Scrapping noice (4/13)
 8/22/23 9:04pm
BillHanna
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Cana, VA - USA

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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.

 



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Re: Scrapping noice (5/13)
 8/22/23 9:21pm
Joe ManueleGold Member
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Interesting. How did you confirm thats what it was?

Re: Scrapping noice (6/13)
 8/22/23 10:55pm
BillHanna
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Cana, VA - USA

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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. . .).



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Re: Scrapping noice (7/13)
 8/23/23 7:12am
Adams' AppleLifetime Member
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Duncanville, TX - USA

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Fan hitting the shroud...



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Re: Scrapping noice (8/13)
 8/23/23 7:16am
Joe ManueleGold Member
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I will definitely check that out and thanks. 

Re: Scrapping noice (9/13)
 8/23/23 7:17am
Joe ManueleGold Member
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Thanks but thats not it. I know that sound from experience unfortunately....lol

Re: Scrapping noice (10/13)
 8/23/23 9:22am
manchestersharkLifetime Member
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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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Re: Scrapping noice (11/13)
 8/23/23 9:48am
Joe ManueleGold Member
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Danbury, CT - USA

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Thanks so much for replying but I am sure it is not that. It seems to be coming from underneath the car but you know how car noises are, you think they are coming from someplace and it ends up being somewhere else. I saw some stuff on the interent that it could be the universal joints which I am going to check out this weekend along with a couple of other possibilities.

Re: Scrapping noice (12/13)
 8/29/23 1:30am
spinalman
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Lancaster, PA - USA

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Check you engine mounts. A broken mount will reposition your engine on acceleration causing something to rub that you otherwise don't hear.

Jan Gerhart

Re: Scrapping noice (13/13)
 8/29/23 9:19pm
Adams' AppleLifetime Member
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#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


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Something I forgot to mention before, but I've seem many times...check the harmonic balancer on the engine. If the rubber ring(elastomer, actually) between the outer ring and the center of the hub is deteriorated, it can allow the outer ring to spin out of position, and scrape/rub on the timing cover. Sometimes they will also vibrate, since the balancer is out of whack, but not always. Just a thought....



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