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Alternator noise with new belt #4515867
09/14/17 07:53 AM
09/14/17 07:53 AM
Joined: May 2005
Posts: 816
Ozark Mountains
callbay Offline OP
callbay  Offline OP
Joined: May 2005
Posts: 816
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?

Thanks!

Re: Alternator noise with new belt [Re: callbay] #4515873
09/14/17 08:03 AM
09/14/17 08:03 AM
Joined: Oct 2009
Posts: 3,342
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,342
Wet side WA
New Alternator or rebuilt Alternator? What's the warranty?


2004 Corolla 125400
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74277
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18
Re: Alternator noise with new belt [Re: callbay] #4515876
09/14/17 08:04 AM
09/14/17 08:04 AM
Joined: Jun 2003
Posts: 17,488
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,488
Deplorable in apple valley, ca
Bad clutched pulley?


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Alternator noise with new belt [Re: callbay] #4515904
09/14/17 08:41 AM
09/14/17 08:41 AM
Joined: Sep 2007
Posts: 989
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 989
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


Re: Alternator noise with new belt [Re: callbay] #4515909
09/14/17 09:00 AM
09/14/17 09:00 AM
Joined: Sep 2014
Posts: 1,460
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,460
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.

Re: Alternator noise with new belt [Re: WobblyElvis] #4515955
09/14/17 09:53 AM
09/14/17 09:53 AM
Joined: Feb 2014
Posts: 2,527
Canada
Lolvoguy Offline
Lolvoguy  Offline
Joined: Feb 2014
Posts: 2,527
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.


bingo!


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