Belt squeal

[rdanford]

About a week ago the alt belt started making some noise...got bad enough this week that I changed it today. Squeal is still there....any ideas?

[akaFrankCastle]

Serp or V set up?

[rdanford]

V-set...all stock 1977 302 with no ac

[ClayJ]

I just changed to the 130 amp alt and introduced belt squeal. It only last about 1 second during startup. There are supposed to be some expensive belts that will stop the squeal. Something about v-belts with notches in the wide edge of the belt that increases pressure on the un-notched portion of the belt.

I havent tried to do anything to squealch the squeal yet.

[rdanford]

I need to figure someting out...its my daily driver...nothing has changed, had the same setup for last 15k miles without any issue

[akaFrankCastle]

Sorry, missed the "alt" portion of your post before.

Make sure the belt is properly tensioned. The typical V-belt should show about 1/2" of "deflection" when you press it with your thumb.

Also check out your pulleys and make sure the bolts are snug.

[rdanford]

Belts are new as of today...pulley's cleaned...bolts snug.

Does not squeal at start-up or idle...squeal increases at RPMs increase; bad alt bearings?

[BFD305]

I would guess going bad alternator or alternator bearings. I may still have the one off our 76 laying around, but won't know until I get off shift Tuesday AM. I am just across 34 bypass from you. Are you still across from the green one or have you moved? Have not your for a while.

[rdanford]

That'd be great...yes, still live on 51st Ave...Bronco has been in the garage for the last 2-3 months...Let me know

[ClayJ]

As I said, I just did the 130amp 3G upgrade, that means I have a known good 2G alternator sitting around. It's yours if you want it.

[rdanford]

Clay, I'll keep you posted...will be heading down to C/S in a couple weeks to see the in-laws....Thanks

[rdanford]

On the way to church today, it stopped...don't know if the belt settled or something, but all is good now....Thanks again guys!

[Rox Crusher]

On the way to church today, it stopped...don't know if the belt settled or something, but all is good now....Thanks again guys!

divine intervention is a great solution

[airbur]

http://shop.advanceautoparts.com/webapp ... RP2035____

[BFD305]

Royce - I looked and we still have the alternator that came off the 76. If it starts squeeling again or you want a spare let me know. Plus it would give us a reason to check out your bronco. You have a mustang too, don't you?

[rdanford]

I'll take you up on the alternator...let me know of a good time for you to stop by or me to swing by your place. The mustang is my brothers, a 67 with 83k original miles. Thanks again!

[airbur]

I was having this same issue. I used the belt conditioner above and that worked for a while but the squeal started back up again. I thought the belt was tight but decided to see if I could get it tighter. I loosened both the upper and lower bolts on the alternator and took a big pry bar and wedged it under the alternator. I was able to get some serious leverage and tightened the belt up quite nicely. No more squeal for now.

[ClayJ]

I was having this same issue. I used the belt conditioner above and that worked for a while but the squeal started back up again. I thought the belt was tight but decided to see if I could get it tighter. I loosened both the upper and lower bolts on the alternator and took a big pry bar and wedged it under the alternator. I was able to get some serious leverage and tightened the belt up quite nicely. No more squeal for now.

Careful or you'll have no more alternator bearings later.

[hockeydad4-22]

My son was having a huge issue with his alt belt on his 66 stang, I mean the squeal was not onoly annoying, it was embarassing. He tried all the above measures, even tried scuffingthe belt and pully with 100 grit paper. No help. Finaly I stoped by the part store on my way home and bought another new belt. Problem solved and he has a spare for road trips.

[rdanford]

Belt is new...tight to specs...pulley cleaned...belt conditioner applied...its a 50/50 chance its going to squeal on me...going to try a different alternator here shortly

[Rox Crusher]

depending on how much squeeling (slipping) the belt has experienced it may have gotten glazed even if "new"

I would try a new belt

[ZOSO]

depending on how much squeeling (slipping) the belt has experienced it may have gotten glazed even if "new"

I would try a new belt

Yep just what he said. I have had this problem with the supercharger belt on my cobra. Never put so many belts on a vehicle.

[rdanford]

Scott...Got the alternator installed tonight and the squeal is gone...my old pulley has a great polish to it, pulley would almost stop at idle....Thanks again guys!

[BFD305]

Awesome. Glad it worked, and it was good to meet you. Jonah is hoping to take his maiden voyage on Monday. We will see!?!?!

[freeheelbillie]

On the way to church today, it stopped...don't know if the belt settled or something, but all is good now....Thanks again guys!

divine intervention is a great solution

The Lord drives an Early Bronco!? For us mere mortals EB's teach us patients and the virtues of lacking vanity hahahahahhaahahha