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#4515867 - 09/14/17 07:53 AM Alternator noise with new belt
callbay Offline

Registered: 05/29/05
Posts: 815
Loc: Ozark Mountains
2011 Ford Fusion with 2.5 4 cyl. 91,500 miles.

The alternator was making a noise that sounded like a bearing. I checked carefully with an engine stethoscope to make sure it was the alternator.

When I installed the new alternator I put on a new belt while I was at it. The new belt was a Gates but I had to get the belt tensioner to the max to let me let the belt on. it does not seem overly tight now though.

The new alternator makes a bearing noise now although not as load as the old one. I thought the belt would break in and stretch some but with 250 miles on it the alternator still makes some noise.

Any thoughts?


#4515873 - 09/14/17 08:03 AM Re: Alternator noise with new belt [Re: callbay]
JohnnyJohnson Offline

Registered: 10/22/09
Posts: 2910
Loc: Wet side WA
New Alternator or rebuilt Alternator? What's the warranty?
2004 Corolla 122703
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: Castrol EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74202
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18

#4515876 - 09/14/17 08:04 AM Re: Alternator noise with new belt [Re: callbay]
Chris142 Offline

Registered: 06/05/03
Posts: 16978
Loc: Deplorable in apple valley, ca
Bad clutched pulley?
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Can am maveric edge 5w40
57 case tractor 15w40

#4515904 - 09/14/17 08:41 AM Re: Alternator noise with new belt [Re: callbay]
JMJNet Offline

Registered: 09/06/07
Posts: 950
Loc: TX, USA
With parts quality now, you almost cannot assume a new part as good unless it is tested.

Sounds like nothing wrong except you get a bad alternator?
Did you test to see if it generates amp as per the specification?
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel

#4515909 - 09/14/17 09:00 AM Re: Alternator noise with new belt [Re: callbay]
WobblyElvis Offline

Registered: 09/23/14
Posts: 1391
Loc: Toronto Canada
With the engine running spray the inside of the belt with a little water. If the noise changes, it's related to the belt not the bearings.

#4515955 - 09/14/17 09:53 AM Re: Alternator noise with new belt [Re: WobblyElvis]
Lolvoguy Offline

Registered: 02/06/14
Posts: 2394
Loc: Canada
Originally Posted By: WobblyElvis
With the engine running spray the inside of the belt with a little water. If the noise changes, it's related to the belt not the bearings.

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