alternator belt help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drewfever1020 · 01-12-2009, 09:26 PM

i tighten the belt on my alternator and its good but after a few drives it gets loose!
why is that? do i need new pullys? and when i punch it, i can smell the rubber from the belts? why?

Tx Firefighter · 01-12-2009, 09:46 PM

Unless your adjustment is slipping, you have a bad belt.

I'm a huge fan of Gates brand or Dayco Top Cog belts myself. They never stretch for me after I put them on.

drewfever1020 · 01-12-2009, 10:57 PM

but it couldnt be my adjustment cuz i tighten the hell out of it

Tx Firefighter · 01-12-2009, 11:00 PM

Well, tight or not, is the adjustment slipping ? Mark it someway and see if it moves over time. Is the bracket cracked ?

PanelDeland · 01-13-2009, 06:24 PM

One thing I see all the time is people who think just because a belt is still together and isn't cracked that it is good.A V bely runs on the V.If it's in the bottom of the pulley tightening it will only help for a short time.
\V/ the sides should contact and be slightly pulled down into the V of the pulley.If the belt goes all the way to the bottom of the pulley it is either the wrong width belt or it's worn out.Unless you have deep groove pulleys the belt should be even with the outer diameter of the pulley or just slightly below.One way of telling if the belt is bad is if the V is glazed.
The other side of this is that a belt that is overtightened will place undue stress on the bearings supporting the pulleys.

01-12-2009, 09:26 PM	#1
drewfever1020 Registered User Join Date: May 2008 Location: san antonio, texas Posts: 412	alternator belt help! i tighten the belt on my alternator and its good but after a few drives it gets loose! why is that? do i need new pullys? and when i punch it, i can smell the rubber from the belts? why?

01-12-2009, 09:46 PM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: alternator belt help! Unless your adjustment is slipping, you have a bad belt. I'm a huge fan of Gates brand or Dayco Top Cog belts myself. They never stretch for me after I put them on. __________________ I'm on the Instagram- @Gearhead_Kevin

01-12-2009, 10:57 PM	#3
drewfever1020 Registered User Join Date: May 2008 Location: san antonio, texas Posts: 412	Re: alternator belt help! but it couldnt be my adjustment cuz i tighten the hell out of it

01-12-2009, 11:00 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: alternator belt help! Well, tight or not, is the adjustment slipping ? Mark it someway and see if it moves over time. Is the bracket cracked ? __________________ I'm on the Instagram- @Gearhead_Kevin

01-13-2009, 06:24 PM	#5
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: alternator belt help! One thing I see all the time is people who think just because a belt is still together and isn't cracked that it is good.A V bely runs on the V.If it's in the bottom of the pulley tightening it will only help for a short time. \V/ the sides should contact and be slightly pulled down into the V of the pulley.If the belt goes all the way to the bottom of the pulley it is either the wrong width belt or it's worn out.Unless you have deep groove pulleys the belt should be even with the outer diameter of the pulley or just slightly below.One way of telling if the belt is bad is if the V is glazed. The other side of this is that a belt that is overtightened will place undue stress on the bearings supporting the pulleys. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

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