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Replaced alternator but kept belt #5192919 08/21/19 12:51 PM
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Deontologist Offline OP
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'06 Camry has been squealing for the last 8+ years. The serpentine belt squeal was so bad in the month or so before the alternator completely gave up. The belt would be constantly squealing anytime the car would be in motion. At a stop light, everyone would be looking at my car. The original alternator finally completely died one night and I decided to replace the alternator.

I would have replaced the belt, but the, um, unhelpful workers at AutoZone sold me the wrong serpentine belt. As a result, I ended up reusing the old serpentine belt.

To my surprise, the squeal is gone! I remember checking the old Denso alternator for play in the pulley, and I found none. The old alternator's pulley spun smoothly. It didn't catch anywhere. It didn't grind. It didn't wobble. It had 0 play.

What happened exactly?

Last edited by Deontologist; 08/21/19 12:51 PM.
Re: Replaced alternator but kept belt [Re: Deontologist] #5192925 08/21/19 12:55 PM
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Elkins45 Offline
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The bearing in the alternator was squealing.

Re: Replaced alternator but kept belt [Re: Elkins45] #5192931 08/21/19 01:00 PM
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HangFire Offline
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Originally Posted by Elkins45
The bearing in the alternator was squealing.

Or, it was causing enough resistance to get the belt to squeal.


Various musings: http://hangfire.net
Re: Replaced alternator but kept belt [Re: Deontologist] #5192963 08/21/19 01:35 PM
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ragtoplvr Offline
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A slipping belt puts a lot of heat in the pulley of the alternator, and can cause the bearing to fail.

Rod

Re: Replaced alternator but kept belt [Re: Elkins45] #5193002 08/21/19 02:16 PM
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Deontologist Offline OP
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Originally Posted by Elkins45
The bearing in the alternator was squealing.


So the bearing was shot but there wasn't any play in the pulley? I thought that bad bearings always meant play/looseness.

Also, does this mean I just exchanged a quality denso alternator for a cheap parts store alternator when all I had to do was change the bearings?

Re: Replaced alternator but kept belt [Re: Deontologist] #5193005 08/21/19 02:18 PM
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JMJNet Offline
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A good alt/starter rebuilder can usually diagnose and change what is needed.

Last edited by JMJNet; 08/21/19 02:18 PM.

  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Replaced alternator but kept belt [Re: Deontologist] #5193057 08/21/19 03:26 PM
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The Critic Offline
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Does your alternator use a decoupler clutch?


2011 Toyota Prius 1.8L - 197K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4 - 138K - Mobil 1 EP HM 5W-30
Re: Replaced alternator but kept belt [Re: Deontologist] #5193166 08/21/19 05:38 PM
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DGXR Offline
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You can spin the pulley by hand, but once you add a significant side load (as the belt would) I bet it will squeal again. So yes this is a bearing failure. Also remember that the electrical system puts a load on the alternator which is in addition to the side load from the belt.

Definitely change the belt asap, they are cheap enough and there is reason to believe yours is damaged.


1995 Corvette coupe LT1 6-speed
2006 Tacoma 2.7 Base SR5 AC
1999 Yamaha YZ400FL
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