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My alternator i believe is making a noise but still charges fine looks to be the original 99 alternator. I read the sticky above but will the replacement autozone alternator cause any codes or will it function just fine as it should? I noticed these have a big pressed pulley type vs the f-body ls1 bolt on pulley design. Also can you run i believe what i read the 145 amp 02-04 alternator direct fit and replacement? I read some guys other thread about balancer wobble. Any idea if a bad balancer with old rubber would make whats sounds like a marble tensioner or pulley that may sound like the alternator area but end up being a balancer? I guess ill try removing the belt to see if the noise goes away. With the belt off would there not be enough tension to cause the balancer wobble issue or help diagnose the problem?
Last edited by Justin Raney; Aug 28, 2021 at 02:17 AM.
It does sound to be around the alternator side or just inside of it isnt a normal squeak like i had from my old 98 ls1 camaro from 2009-2014 The tensioner would make a squeak had replaced it and i think maybe regreased or the idler pulley by pulling the seal. Sounds more of a marble wobbling type of noise at low 700 prm-1000 then goes away when revved 2-3k. Any idea if a 3/8ths hose by ear would actually work and locate the noise spot on? Mine has that big old pulley type of pressed on pulley does sound on the drivers side of engine but could be coming from center or balancer down under the alternator. Man thats a nasty pulley so its pressed on and off? 76$ any idea if you did need a replacement autozone has a 102amp duralast for 168$+13$ core and looks to have the nut style stud pulley similar to f-bodys unless the pictures arent correct. I can maybe get a 10 second video tomorrow with it running only does it at lower rpms sometimes and can only hear it with the hood up.
Last edited by Justin Raney; Aug 28, 2021 at 02:57 AM.
It does sound to be around the alternator side or just inside of it isnt a normal squeak like i had from my old 98 ls1 camaro from 2009-2014 The tensioner would make a squeak had replaced it and i think maybe regreased or the idler pulley by pulling the seal. Sounds more of a marble wobbling type of noise at low 700 prm-1000 then goes away when revved 2-3k. Any idea if a 3/8ths hose by ear would actually work and locate the noise spot on? Mine has that big old pulley type of pressed on pulley does sound on the drivers side of engine but could be coming from center or balancer down under the alternator. Man thats a nasty pulley so its pressed on and off? 76$ any idea if you did need a replacement autozone has a 102amp duralast for 168$+13$ core and looks to have the nut style stud pulley similar to f-bodys unless the pictures arent correct. I can maybe get a 10 second video tomorrow with it running only does it at lower rpms sometimes and can only hear it with the hood up.
yes here is a video i may lay them in different post because i did one time it just left the urls. It goes away when revving just at idol i believe. My phone will only take 10 second videos why i took a few different videos to post.
May i ask if the coupler pulley looks like a solid pressed on piece does it have bearings? Does sound maybe more like its in the alternator brush area is there bearings in there? It may be the pulley. Looks to be the original 99 alternator?
May i ask if the coupler pulley looks like a solid pressed on piece does it have bearings? Does sound maybe more like its in the alternator brush area is there bearings in there? It may be the pulley. Looks to be the original 99 alternator?
Have a look to determine the type of decoupler pully you have...
GATES TRAINING: Alternator Decoupler Pulley - How to Inspect and Replace (full version)
Great thanks for the information. May i ask how long you think it would last like this? Is it cheaper to replace the whole alternator or the pulley itself? Does sound more like a decoupler pulley from idol or once you let the revs go back down and pulley catch up to the rpms? Do they normally have a cover on there as in the video or are they already exposed showing the splines of the decoupler pulley? Also when i looked at autozone there pictures showed what looked to be a solid bolted on pulley similar to the f-body or i guess a six speed car pulley with 102amps and duralast being the only option. Also my balancer has old rubber or cracks but nothing out of the ordinary i noticed when doing some work to the car up front. I will probably change it when i do a cam in the near future or if it fails which would be way too far ahead or catastrophic failure from what i read out of the dorman balancer for 60$ or ac delco for 75$ and the dayco 1117N balancer for around 90$ on amazon. I was reading threads and everyone suggests the dayco balancer in relation to stock replacements? Also more importantly related to this thread a new replacement alternator is 400$ or does the duralast 170$-190$ work just as fine eliminating the decoupler pulley. Im assuming the autozone or local auto part store replacements all have the solid pulley type. On an f-body i believe the solid pulley works fine for auto cars better i never had one too compare. Lastly is there place that sells the decoupler pulley cheaper or is 76$-80$ the cheapest?
Last edited by Justin Raney; Aug 29, 2021 at 05:13 PM.
Hey thanks i have a t50 but do you have any idea if the 33 spline 17mm alternator decoupler tool they have advertised on ebay is the correct one for gm?
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Originally Posted by Justin Raney
Hey thanks i have a t50 but do you have any idea if the 33 spline 17mm alternator decoupler tool they have advertised on ebay is the correct one for gm?
Thats the tool I have. I used it to remove my pulley so I could put my 8 rib pulley on my alternator
I took the belt off to free spin some pulleys and the alternator pulley is lacking grease as well as tensioner. I checked with a 3/8th hose and the noise is coming from around the alternator pulley bearing opening. I had regreased the tensioner pulley that had no grease and there is no noise from it with a hose or anything on that side of engine just right on the alt pulley you can hear the noise. I ordered a new old stock continental 49908 for 29.75$ off ebay this morning so hopefully does the trick. I was able to regrease the nsk tensioner bearing as it had no grease.
Are these correct before ordering Gates/AC delco 38008 tensioner pulley and dayco 89007 idler pulley for the main belt drive? Rock auto has the dayco tensioner for 11.81$ on sale More Information for DAYCO 89337 (rockauto.com) vs amazon for 43$. Is it better to purchase the whole tensioner? Does look to be a different design from stock.
alternator noise?
