So my car keeps throwing belts....
Thread Starter
10 Second Club
Joined: Feb 2012
Posts: 1,261
Likes: 6
So my car keeps throwing belts.... Because of my bulk under drive pulley. The pulley on the alternator got a little chewed during install and I'm pretty sure it's what is shredding my belts. Can I go back to a stock alternator pulley? My car idles around 800, and I have no ac of anything. Auto car though. I do have a small sub and amp, but I think I'm going to remove them. Anyone running JUST the crank pulley? Belts are getting too expensive.... Lol
On The Tree
Joined: Oct 2012
Posts: 166
Likes: 0
From: Houston
well...you cant just run no belts, you need the alternator to keep the car running, otherwise youll just drain the battery. so if i understand this correctly you have an underdrive pulley on the alternator? and its chewing up belts? well if you removed and installed the alternator pulley you sure as hell can put the original one back on.
Try and figure out which of the pulleys is out-of-plane.
This is the only reason for shredding belts. Every
belt-to-pulley face "should" be static, no movement,
where there is contact -no scrub, no shred. That's
what you get when everything is in-plane. But if you
force the belt to walk or settle in as it makes contact,
there's your shredding.
This is the only reason for shredding belts. Every
belt-to-pulley face "should" be static, no movement,
where there is contact -no scrub, no shred. That's
what you get when everything is in-plane. But if you
force the belt to walk or settle in as it makes contact,
there's your shredding.
My alernator pulley would not seat correctly and/or was machined to deep. It put angle in the belt system, and it would walk off in about 10 miles. Went back to the stock alternator pulley. Has been just fine.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
I've never been a fan of overdrive alt pulleys, the smaller pulley should be avoided if you like to race your car, since you'll likely be spinning the alternator faster than it's designed for (over-reving). FYI, it's better to just bump the idle speed up a little if the UD crank pulley is turning the alt. pulley to slow.
TECH Fanatic
Joined: Jun 2011
Posts: 1,343
Likes: 8
From: Katy, TX
If you don't have easy access to an impact wrench, here is a good way to do it without damaging the pulley. With this method you may still need to jam the cooling fins to keep the internals from spinning.
You can also use socket with some wrench flats, or grind some on a regular socket, that way you can still use a allen wrench to hold the shaft still while tightening the nut.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
well...you cant just run no belts, you need the alternator to keep the car running, otherwise youll just drain the battery. so if i understand this correctly you have an underdrive pulley on the alternator? and its chewing up belts? well if you removed and installed the alternator pulley you sure as hell can put the original one back on.
Worst reading comprehension ever! 
