Belts wont stay on pulleys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Srubydo1986 · 04-15-2007, 02:16 PM

I have a 1986 silverado and whenb ever i rev the motor high the belts fall off the pully, and well that wont do.

My truck is all v belt setup, not part sepertin, part v belt. My pulley appear to be lined up and i cant tighten the belt any freather (they are all the way for the bracket and the belt are tight as crap). So how do i solve this problem will i need smaller belts or is something else wrong.

This will be my 3rd belt swap cause nothing seems to work right.

P.s. Truck is an ac truck but without the compressor and all bracket are out of a non ac truck. Ill take pics soon.

BaddBusa2005 · 04-15-2007, 02:59 PM

i had that same problem with my vbelt setup. I ended up just buying the most exspensive belt on it.... I think it was a good year gator back

killthewabbit · 04-15-2007, 03:05 PM

Same here. I replaced my belt with a Pro-Cog that I got from Advance and never threw one again.

Srubydo1986 · 04-15-2007, 03:25 PM

hmm guess that make sents i have the duralast 8.99 belts. That might be way i can seem to keep them on.

Or my truck is just so powerfull that i cant keep it together

or maybe not

knightlife · 04-15-2007, 04:45 PM

check your pulleys....make sure they line up, if they dont...then your truck will throw the belts everytime (been there, and it sucks out in BFE oklahoma lol). if they are off "alignment", use washers to correct the problem

Srubydo1986 · 04-15-2007, 10:25 PM

well i found one problem i took the fan pully from my 327 block i had laying around but i didnt take the crank pully causeing some issues for the line up. After that was fixed i managed to get the power steering to stop falling off but the fan and alt belt is well bent it curves. Dont know if this cause the belt wanting to rotate in the grove so the botom is up but it stys in place.

I get another one and see what happens and most likey a better one. BUt i didnt know gator back made a v belt.

**N2TRUX** · 04-15-2007, 11:56 PM

Take a look at all your brackets too. I had a problem like this in the past and it turned out to be a cracked bracket the flexed as the motor was revved. At idle everything looked fine but when the engine torqued from revving up it caused a misalignment and threw the belt.

Srubydo1986 · 04-16-2007, 10:34 AM

ill take a look i dont think any are cracked but it doesnt hurt to look.

04-15-2007, 02:16 PM	#1
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Belts wont stay on pulleys I have a 1986 silverado and whenb ever i rev the motor high the belts fall off the pully, and well that wont do. My truck is all v belt setup, not part sepertin, part v belt. My pulley appear to be lined up and i cant tighten the belt any freather (they are all the way for the bracket and the belt are tight as crap). So how do i solve this problem will i need smaller belts or is something else wrong. This will be my 3rd belt swap cause nothing seems to work right. P.s. Truck is an ac truck but without the compressor and all bracket are out of a non ac truck. Ill take pics soon. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

04-15-2007, 02:59 PM	#2
BaddBusa2005 Registered User Join Date: Feb 2006 Location: Cleveland, TN Posts: 440	Re: Belts wont stay on pulleys i had that same problem with my vbelt setup. I ended up just buying the most exspensive belt on it.... I think it was a good year gator back __________________ 1981 Custom Deeluxe SWB 5.3/4L60e 3.73 and Auburn. Mustang Dyno 265hp/258tq

04-15-2007, 03:05 PM	#3
killthewabbit Spear and magic helmet! Join Date: Oct 2006 Location: Nashville, TN Posts: 1,226	Re: Belts wont stay on pulleys Same here. I replaced my belt with a Pro-Cog that I got from Advance and never threw one again. __________________ -- Will

04-15-2007, 03:25 PM	#4
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: Belts wont stay on pulleys hmm guess that make sents i have the duralast 8.99 belts. That might be way i can seem to keep them on. Or my truck is just so powerfull that i cant keep it together or maybe not __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

04-15-2007, 04:45 PM	#5
knightlife Dark Heart Motorsports Join Date: Apr 2007 Location: 29404 DKFX Posts: 683	Re: Belts wont stay on pulleys check your pulleys....make sure they line up, if they dont...then your truck will throw the belts everytime (been there, and it sucks out in BFE oklahoma lol). if they are off "alignment", use washers to correct the problem __________________ How Deep Can YOU Bleed..? 1985 Chevy Blazer K5- 6.2 N/A, 400 turbo trans CUCV, 12v converted... a new chapter 2005 GMC Sierra Crew Cab 6.0 powwwaa!!! custom jumpseat install w/ captain seats, Hypertech tuner, MSD Blaster Coils, CB and twin antenna's, all electric interior, touch screen in dash. custom center console, with jump seat replacing original console. 1500 HD!

04-15-2007, 10:25 PM	#6
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: Belts wont stay on pulleys well i found one problem i took the fan pully from my 327 block i had laying around but i didnt take the crank pully causeing some issues for the line up. After that was fixed i managed to get the power steering to stop falling off but the fan and alt belt is well bent it curves. Dont know if this cause the belt wanting to rotate in the grove so the botom is up but it stys in place. I get another one and see what happens and most likey a better one. BUt i didnt know gator back made a v belt. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

04-15-2007, 11:56 PM	#7
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: Belts wont stay on pulleys Take a look at all your brackets too. I had a problem like this in the past and it turned out to be a cracked bracket the flexed as the motor was revved. At idle everything looked fine but when the engine torqued from revving up it caused a misalignment and threw the belt. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

04-16-2007, 10:34 AM	#8
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: Belts wont stay on pulleys ill take a look i dont think any are cracked but it doesnt hurt to look. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

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