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Slipping fan belt pulley MOD???
Posted by: anthonyvsalgado ()
Date: July 10, 2018 11:07PM

My fan belt pulley kept slipping and throwing the belt. I would tighten it down but could only tighten it so much without stripping out the threads. I became frustrated with this and created a different pulley system that solve the problem. Not sure if anybody else has this problem, if you do I may be able to help. I can share the measurements and clearances for the bolt adjusting pulley, eliminating the prying motion and the slipping.



Edited 1 time(s). Last edit at 07/11/2018 08:13AM by MattNall.

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Re: Slipping fan belt pulley MOD
Posted by: anthonyvsalgado ()
Date: July 10, 2018 11:21PM

If there are any questions my email is anthonyvsalgado@aol.com
I'll be faster at responding...

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Re: Slipping fan belt pulley MOD
Posted by: Spectre ()
Date: July 11, 2018 04:44AM

Overtightening is a major cause of throwing a belt.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Slipping fan belt pulley MOD
Posted by: jjohnsonjo ()
Date: July 11, 2018 05:09AM

No need to pry anything, you should be able to turn the alternator with one finger when cold. Tighter than that you will throw belts.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

Image and video hosting by TinyPic

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Re: Slipping fan belt pulley MOD
Posted by: Lane66m ()
Date: July 11, 2018 05:37AM

Be prepared for reduced life of alternator bearing, fan bearing and idler pulley bearing due to the increased tension on them.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: Slipping fan belt pulley MOD
Posted by: OttawaCorvairGuy ()
Date: July 11, 2018 05:50AM

Lane66m Wrote:
-------------------------------------------------------
> Be prepared for reduced life of alternator
> bearing, fan bearing and idler pulley bearing due
> to the increased tension on them.


Been there done that.

The time was mid 80's with first wife or fiancée at that time. Newly rebuilt Generator, New belt, Tune-up and long road trip. I had moved to Colorado and we were driving the 63 Coupe there. Somewhere in KS, I lost a bushing on the Generator (Belt too tight) and had to charge the battery over night and drive as far as we could on the charge while not putting much or a load on the generator and not overheating the engine too. Fun times..

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Re: Slipping fan belt pulley MOD
Posted by: Huntsville ()
Date: July 11, 2018 07:18AM

I think he is saying that the adjustment of his tensioner is slipping.



Danny Robertson
Huntsville, Al
'64 Spyder (Daily Driver)
'63 Rampside (Rotisseried and in Progress!)

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Re: Slipping fan belt pulley MOD
Posted by: rowin4 ()
Date: July 11, 2018 07:34AM

I have found that once a belt comes off it usually will continue to come off for some reason even with the corvair odd belt system. As stated above over tightening will cause the problem. A new belt is in order even if you have a fix in place. Do not over tighten. Most everyone keeps a spare in the glove box with a wrench if needed.

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Re: Slipping fan belt pulley MOD
Posted by: MattNall ()
Date: July 11, 2018 07:54AM

Welcome to the CCF! You forgot to check the box in the post to email you with replies. I did it for you..

We need lots more info....as only newbies have this problem..

What belt are you using?





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Slipping fan belt pulley MOD
Posted by: corventure Dave ()
Date: July 11, 2018 08:14AM

The stud or the threaded hole in the Delcotron adapter, that retains the belt idler pulley bracket can also be rethreaded with a thread insert quite easily. However the Delcotron adapter will have to be removed to do this properly. Many of us just change out the adapter. Late alternator adapters are getting a bit more scarce because many have installed alternators in place of the Early series generators. But they re still out there.

That all being said... Anthony, I would like to see what you have created. I always like to see people being creative and inventive. That's just the spirit that got me through the days when I was in school back in the 1960's and 1970's, driving my Corvair with little money to spend on repairs and no Corvair parts venders like we have today. Pictures please if possible. smileys with beer

Corventure Dave

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Re: Slipping fan belt pulley MOD???
Posted by: 66vairman ()
Date: July 11, 2018 08:28AM

X 2 on what Matt said.

Over the decades the issues of Corvair fan belt problems and solutions have been discussed.

On my cars I made sure all the fan belt issues were addressed and I've never had a fan belt come off.

BTW the auto parts stores fan belt list from the manufactures for the Corvair is STILL incorrect.

A fellow with came to our club meeting with his recent Corvair purchase and said his fan belt was coming off. We found the wrong fan belt on the car and a few other issues. Fortunately someone had a correct spare belt and we put it on and showed him how to properly adjust it.

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Re: Slipping fan belt pulley MOD???
Date: July 11, 2018 02:01PM

WAY too loose is better than a little too tight. Tighter belts WILL throw (when everything else is like it should be)
Although our Robson spring loaded idlers are popular a stock street Corvair will usually not need one.
The comments about bearing failure when too tight are valid as well.

But we've ignored the obvious question - How do you know your belt is "slipping"?

Lon Wall

Fireman Sumpter Valley Railroad #3 and #19
svry.com
www.pacificmodelloggerscongress.com

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Re: Slipping fan belt pulley MOD???
Posted by: Spectre ()
Date: July 11, 2018 04:34PM

I think after re-reading the OP's post, the problem is the idler pulls moving after he tightens it down.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Slipping fan belt pulley MOD???
Posted by: anthonyvsalgado ()
Date: July 11, 2018 04:44PM

I purchase belts from California Corvair. I appreciate everybody helpful info on how how over tightening is a cause for throwing belts--Thank you. My problem was the pully kept slipping and losing tension and subsequently throwing the belt.



Edited 1 time(s). Last edit at 07/11/2018 05:46PM by MattNall.

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Re: Slipping fan belt pulley MOD???
Posted by: Spectre ()
Date: July 11, 2018 05:22PM

Show us your mod.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Slipping fan belt pulley MOD???
Posted by: MattNall ()
Date: July 11, 2018 05:49PM

Normally this never happens if the belt is left loose... We need those pics!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Slipping fan belt pulley MOD???
Posted by: 66vairman ()
Date: July 11, 2018 06:14PM

anthonyvsalgado Wrote:
-------------------------------------------------------
> I purchase belts from California Corvair. I
> appreciate everybody helpful info on how how over
> tightening is a cause for throwing belts--Thank
> you. My problem was the pully kept slipping and
> losing tension and subsequently throwing the belt.

A slipping idler pulley is unusual. I have seen some with a missing washer and then the nut chews up the slot.

Do you have a belt guide on the pulley?

A failing bearing (fan, pulley, alternator/generator) can put a lot of tension on the belt. Did you check the bearings with the belt off?

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Re: Slipping fan belt pulley MOD???
Posted by: anthonyvsalgado ()
Date: July 11, 2018 10:53PM

Sorry for the delay. I will post the pictures of my mom as soon as I get the opportunity. Thank you for your patience

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Re: Slipping fan belt pulley MOD???
Posted by: joelsplace ()
Date: July 11, 2018 11:31PM

Hmmm. Do we want to see your mom?

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Re: Slipping fan belt pulley MOD???
Posted by: Wagon Master ()
Date: July 12, 2018 05:28AM

Why yes.
Yes we do.

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