Alternator pulley not lining up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

barmanvarn · 06-23-2021, 05:49 PM

Had to replace my old alternator today as it started making a horrible racket.

Local parts place had a new one in stock and it SEEMED to be identical to my old one. Only when I got the new one installed did I realize the pulley is about 1/4 inch out of alignment towards the rear.

That being said, I don't see any means of adjusting the alternator forward any. With the way it mounts, it's locked it place between two brackets so it can't move forward or backward.

I've never run into this before so not sure what I should do. Do I try another alternator and hope it lines up? Do I get new upper and lower mounts that would allow me to align the pulley (if they even exist)? Do I have a shop shim the pulley for me?

thanks in advance

body bolt · 06-23-2021, 06:09 PM

Get another alternator and compare it to this one before you leave the store.

barmanvarn · 06-23-2021, 06:19 PM

Quote:

Originally Posted by body bolt

Get another alternator and compare it to this one before you leave the store.

That's for sure my plan for now....just didn't want to spend weeks ordering different alternators only to find out I was doing something wrong. LOL

thanks

body bolt · 06-23-2021, 06:26 PM

This is assuming your original alternator was correct.

gmc684x4 · 06-23-2021, 07:12 PM

Go back to store pull pulley off and swap pulleys

06-23-2021, 05:49 PM	#1
barmanvarn Registered User Join Date: Nov 2014 Location: Sherwood, AR Posts: 189	Alternator pulley not lining up Had to replace my old alternator today as it started making a horrible racket. Local parts place had a new one in stock and it SEEMED to be identical to my old one. Only when I got the new one installed did I realize the pulley is about 1/4 inch out of alignment towards the rear. That being said, I don't see any means of adjusting the alternator forward any. With the way it mounts, it's locked it place between two brackets so it can't move forward or backward. I've never run into this before so not sure what I should do. Do I try another alternator and hope it lines up? Do I get new upper and lower mounts that would allow me to align the pulley (if they even exist)? Do I have a shop shim the pulley for me? thanks in advance __________________ Brian '69 GMC C15 Inline 6, 230ci (possibly 250ci)

06-23-2021, 06:09 PM	#2
body bolt Registered User Join Date: Oct 2020 Location: Albuquerque, New Mexico Posts: 474	Re: Alternator pulley not lining up Get another alternator and compare it to this one before you leave the store.

06-23-2021, 06:26 PM	#4
body bolt Registered User Join Date: Oct 2020 Location: Albuquerque, New Mexico Posts: 474	Re: Alternator pulley not lining up This is assuming your original alternator was correct.

06-23-2021, 07:12 PM	#5
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	Re: Alternator pulley not lining up Go back to store pull pulley off and swap pulleys



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