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 3Likes
08-01-2013, 06:42 AM
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CC Member
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Join Date: Jan 2011
Location: Rockland County,
NY
Cobra Make, Engine: West Coast Cobra/427
Posts: 853
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Not Ranked
Alternator belt screeching
I changed my alternator last year to a 350 amp single wire unit and I have noticed that if my temp goes to 200 degrees or more despite that my fans immediately kick on the belt of my alt screeches.
Not until it goes down to 180 degrees it quiets down. I used belt dressing but I was told that it could be too aggressive that the belt can come off.
My belt has the inner teeth and fits perfectly in the pulley. Any thoughts?
Sincerely
Lou
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 Basque1
"Cobra--Because life is too short to drive a boring car"
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08-01-2013, 07:52 AM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Check that the alt pulley is in perfect alignment with the crank and water pump pullies. Look at the sides of belt for wear marks.
Also that you can deflect the belt 1/2" in the middle of two pullies. Don't use dressings.
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Chas.
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08-01-2013, 07:59 AM
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CC Member
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Join Date: Feb 2010
Location: Hermosa Beach,
ca
Cobra Make, Engine: ERA#520, Roush 427SR
Posts: 203
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Agree with ERA Chas. A new belt may be in order.
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08-01-2013, 08:04 AM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
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I have used belt dressing in the past and found that it collects dirt and actually may make the belt squeal. I think a clean belt/pulleys is the way to go.
Larry
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Alba gu brąth
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08-01-2013, 09:51 AM
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CC Member
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Join Date: May 2003
Posts: 1,313
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350 amp? Do you have a microwave in the trunk?
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08-01-2013, 09:51 AM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,506
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I bad a solar pro lem when I switched to.a.different salt. The alignment was off about 1/4 inch. Any load caused a god awful squeal. Check the alignment and .make sure it's tight.
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Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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08-01-2013, 10:01 AM
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CC Member
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Join Date: Jan 2011
Location: Rockland County,
NY
Cobra Make, Engine: West Coast Cobra/427
Posts: 853
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Not Ranked
Quote:
Originally Posted by CowtownCobra
350 amp? Do you have a microwave in the trunk?
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 Nah just want to make sure I have enough power to crank the engine when the fans are going and still have power left over.
Lou
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Basque1
"Cobra--Because life is too short to drive a boring car"
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08-01-2013, 10:01 AM
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CC Member
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Join Date: Jul 2005
Location: Carpentersville,IL & Maricopa,,
AZ
Cobra Make, Engine: ACE, 351W, 3550 Tremec, Raging(?) Red W/ White Stripe.
Posts: 2,082
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Quote:
Originally Posted by Danr55
I bad a solar pro lem when I switched to.a.different salt. The alignment was off about 1/4 inch. Any load caused a god awful squeal. Check the alignment and .make sure it's tight.
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Dan, isn't it a ***** when you wake up with a bad hangover and try to write a sensible sentence?  I know, I also have that problem. 
Ralph 
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SPEED WAS HIGH - WEATHER WAS NOT - TIRES WERE WET - X MARKS THE SPOT
Burma Shave 
Last edited by RedSnake351; 08-01-2013 at 10:02 AM..
Reason: Trying to write a sensible sentence.
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08-01-2013, 10:03 AM
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CC Member
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Join Date: Jan 2011
Location: Rockland County,
NY
Cobra Make, Engine: West Coast Cobra/427
Posts: 853
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Thanks guys,
this is a new belt and the alignment is good, this only happens when the temp reaches 200 degrees, then the fans kick on and eventually the squealing goes away, drives me nuts
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Basque1
"Cobra--Because life is too short to drive a boring car"
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08-01-2013, 10:21 AM
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CC Member
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Join Date: Apr 2008
Location: Glastonbury,
Ct
Cobra Make, Engine: ERA2041 sold 2021
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This may sound obvious, but are you sure the belt is tight enough. Mine screeched until I tightened it a little.
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08-01-2013, 10:34 AM
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CC Member
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Join Date: Mar 2003
Location: st louis mo,
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slipping belt
Dont waste your money on belt dressing use the paste style tooth paste
it sounds like the belt has polished the pullies and the tooth paste has just enough grit to take the polish off
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Joe
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08-01-2013, 10:51 AM
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CC Member
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Join Date: Jan 2011
Location: Rockland County,
NY
Cobra Make, Engine: West Coast Cobra/427
Posts: 853
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Quote:
Originally Posted by PeteF
This may sound obvious, but are you sure the belt is tight enough. Mine screeched until I tightened it a little.
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YUp I double checked it and it is very tight. Someone suggested that the chrome pulley might be the issue.
Lou
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Basque1
"Cobra--Because life is too short to drive a boring car"
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08-01-2013, 12:12 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
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Quote:
Originally Posted by Danr55
I bad a solar pro lem when I switched to.a.different salt. The alignment was off about 1/4 inch. Any load caused a god awful squeal. Check the alignment and .make sure it's tight.
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I don't mean to laugh Dan but this was pretty funny!!
Larry
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Alba gu brąth
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08-01-2013, 02:45 PM
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CC Member
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Join Date: Jan 2011
Location: Rockland County,
NY
Cobra Make, Engine: West Coast Cobra/427
Posts: 853
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Quote:
Originally Posted by tnlprt
Dont waste your money on belt dressing use the paste style tooth paste
it sounds like the belt has polished the pullies and the tooth paste has just enough grit to take the polish off
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Toothpaste as in Colgate and crest...seriously 
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Basque1
"Cobra--Because life is too short to drive a boring car"
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08-01-2013, 03:20 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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lou loose the chrome.....JMHO
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Fred B
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08-01-2013, 06:51 PM
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CC Member
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Location: st louis mo,
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Yes as in crest or colgate
It takes less paste than what you put on your tooth brush every morning
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Joe
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08-01-2013, 06:55 PM
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CC Member
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Join Date: Mar 2003
Location: st louis mo,
Posts: 60
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yes Colgate or Crest
use less than what you put on your tooth brush each morning
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Joe
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08-02-2013, 05:11 AM
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CC Member
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Join Date: Jan 2011
Location: Rockland County,
NY
Cobra Make, Engine: West Coast Cobra/427
Posts: 853
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Quote:
Originally Posted by FWB
lou loose the chrome.....JMHO
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I can't it is part of the new alternator and the old alternator's pulley is not interchangeable. I need to find another solution with what I have.
Lou
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Basque1
"Cobra--Because life is too short to drive a boring car"
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08-02-2013, 08:48 AM
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CC Member
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Join Date: Jun 2013
Cobra Make, Engine:
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If tooth paste helps why won't lapping compound work even better to roughen up the pulley groove? Sounds like the chrome is what the issue is. But WTFDIK?
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08-02-2013, 03:47 PM
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CC Member
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Join Date: Dec 2011
Location: Parkville,
md
Cobra Make, Engine: superformance 1022
Posts: 156
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350 amps? My Peterbilt has a 160 amp alternator to charge four 1000 cca batteries and runs all lights AC and stereo. I think you went way too big. JMHO. Tom
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