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Author Topic:   Belts that will not stay on?
uforacing51
Dirt Freak

Total posts: 349
posted August 11, 2002 11:50 PM
O.K. crew people...
I was running first in the heat and got a flat, happens to everyone, but I was leading the feature and the car just kept getting hotter and hotter. I got another flat and took it in and it looked like old faithful by then. Didn't hurt the engine but found a brand new fan belt had turned around and come off. the pulleys are in alignment and I use a single belt for the power steering and a single for the fan. the belt for the fan has to be out of the pulley just a smidge cause I can't find a belt that fits perfectly. there is no alternater, AND I can not keep the darn belt from coming off, what do I do???? getting kinda frustrated as I have not had a car that good in some time. I should have won the main but got beat in the garage. and I hate that.

pappyoutlaw
Dirt Full Roller

Total posts: 31
posted August 12, 2002 08:33 AM
If the rules will allow you to run aluminum pulleys, that is the way to go. I had the same problem untill I put aluminum pulleys on. They have a deeper groove and the belts will stay on.

powerglides
Dirt Full Roller

Total posts: 69
posted August 12, 2002 09:14 AM
Just some things to look at. Is the lower pulley bent,does the fan hit the shroud,is the belt tight enough,does one pulley have a dent in it. I only use napa or gates belts.

racer17j
Dirt Forum Champ
Total posts: 1565
posted August 12, 2002 01:15 PM UIN: 54865418
how do you have your belt for the power steering is it on bolth pullies or just the top or bottom? and this is just all of a sudden probelm right never had it happen before.if it's just on one i would check the other pully and make sure it's alright. if your steering is on the bottom only i would check the water pump grab your fan and and see if it moves at all see if maybe the bearing is out of it and by the belt being out you mean it's wider than the groove?and last are you using after market pullies or stock?

merlinmech
Dirt Full Roller

Total posts: 51
posted August 12, 2002 03:43 PM
If you're using stock pulleys, try using a 3/8 belt. It's narrower and will usually stay in the grooves better.

DirtDobber
Dirt Forum Racer

Total posts: 79
posted August 12, 2002 04:37 PM
What kind of fan are you running? try a 4 or five blade fan you maybe loading your belts too much and causeing then to slip a bit. Another thing does your power stering have the third point brace - the one that usually bolts the pump to the exhaust manfold. Without it the pump WILL flex and pop the belt. Been there done that.

marty
Dirt Maniac

Total posts: 111
posted August 12, 2002 04:56 PM
Like powerglides says - use good belts (some brands stretch a lot).
I also run a alternator. I run the belt around the crank pulley/fan & alternator. This way if the belt comes off I get an early warning when the charge light comes on in the cab & I can watch the gauge more closely.

jammin
Dirt Administrator

Total posts: 5556
posted August 12, 2002 06:23 PM UIN: 16262997
Top Cog Belts from Dayco

jammin

uforacing51
Dirt Freak

Total posts: 349
posted August 12, 2002 07:01 PM
Oh Man, thanks for all the good ideas, O.K. here goes...
Powerglides, both upper and lower pulleys are in good shape. Fan isn't hitting the shroud anywhere. and pulleys are straight but stock.
Merlinmech, and Jammin, It was a brand new belt, a drive rite belt from Champion Auto. Hmmm...?
DirtDobber, 6 blade 17 inch fan from Performance Bodies, brand new cause of an accident 2 weeks ago, had to put new frame horns on the car, could this be causing a problem? I stuffed the front end into the radiator... destroyed the radiator. Hmmmm?
racer17j, power steering is just on bottom, was a problem before then I cured it till the accident, put all identicle stuff on and now its a problem again, wonder what I did? everything is stock and pump is good, belt is out by just a 16th of an inch, but is kinda tight hmmm?
Marty, Great Idea!!!!
I am thinking of using the aluminum pullys and belts. I have purchased a modified for next year (99 Harris from the forum!!) and can use them for next year also, only 3 races left in season and I will miss 2 of them cause of commitments to the military. So next week end is it, like the idea of the reduction too, as the 3 core radiator that I was running did the trick for the heat, now the 2 core that was the replacement to get me through the night is the one that gets the call for the rest of the season.
Thanks for all the great ideas and info, will let you all know how your ideas faired after end of my season.

jammin
Dirt Administrator

Total posts: 5556
posted August 12, 2002 07:08 PM UIN: 16262997
It doesn't matter if it is a brand new belt...I am not sure of the brand you have, but I do know that if there isn't enough fiber in the belt, it will stretch no matter how new it is. I went thru this a long time ago, I went to Top Cogs and not had any trouble since. The quick revs that a dirt car usually has makes the accessories change rotation speed very quickly, slow fast slow fast for ever turn, this is what causes the stretch usually. The more horse you get and less rotating weight you have, you will notice it more and more. The top cog belts are cheaper than Napa belts by the way.

jammin

uforacing51
Dirt Freak

Total posts: 349
posted August 12, 2002 07:46 PM
Interesting...
the belt must have come off while I was racing in the heat, the cars temp just kept going up while I sat in the lineup waiting for the mod main to end. I didn't hear the winding up of the fan when i gunned it. these things happen when you are a 1 man show for the evening. I wish the light would have come on while I was in the pits instead of sunday morning. I almost tipped it over when I spun, (in the heat) it got up on two wheels!!, I see some mud in the lower pulley this afternoon too, I think I will put some screen under the fan for this weekend.

[This message has been edited by uforacing51 (edited August 12, 2002).]

SLEEPY GOMEZ
Dirt Maniac

Total posts: 199
posted August 12, 2002 09:13 PM
Several of you were right about some things. Dayton Top Cog and Gates Green Stripe are the better belts. No dents or wobbles in pulleys. But the one thing I have found over time is this. The belts must be in alignment, perfect alignment, not close. Use straight edges to check twist alignment and pulley to pulley alignment. The accessory mounts must not flex under load.

I have never seen belts come off when the pulleys are in PERFECT alignment UNDER POWER. That is unless the belt is damaged like jammin mentioned. I have seen some new belts recently which have stretched due to mfg flaws. Check your new belts after each race for a while. SLEEPY

o5racer
Dirt Maniac

Total posts: 115
posted August 12, 2002 09:47 PM
I think your biggest problem is that your belt for the fan is not tight enough. You said your self it is not all the way in the pulley. Either run a small alternator so you can set the tension on the belt, or do like i did and get an idler pulley/ tensoiner from an older ford. make a small bracket on the drivers side and bolt on the tensioner. small, dont weigh much and the belt is always tight.

Tim Weiss
Dirt Roller

Total posts: 12
posted August 13, 2002 09:28 PM
these are all very good replies had same problems last year and lost many races and head gaskets and heads. invested in the aluminum pulleys have not lost a belt all year

uforacing51
Dirt Freak

Total posts: 349
posted August 16, 2002 01:01 PM
The pulleys are in good shape and don't wobble but, as far as in alignment, well they very well could be out of alignmemt. All of the pulleys are monte carlo except the top one, I used it to get the reduction we all desire. I used a spacer to get it close but maybe not close enough still. No matter though as I have the new ones in hand and they will be on the car tonight. I will let you know how things go, the weather is calling for 60 or less by race time saturday so I don't think I will be worrying about a hot day. LOL.

uforacing51
Dirt Freak

Total posts: 349
posted August 19, 2002 11:55 AM
WELL, How about that,
Thanks to all of you that offered suggestions to cure the heating problem. I used the billet pulleys from performance bodies and the car ran great. It ran so great that I lead every lap of the heat race and every lap of the main event. I won the main for the first time in my life. I hate to admit that, but I have never won a main in 20 years of racing. But I have won a main now and I won it convincingly. I have finished second so many times I don't think Harry Gant could hold a candle to me. The odds were very much in my favor, LOL. Thanks again to all who made comments, I looked at them all and made sure your idea was either a yes or no on the car.

AC156
Dirt Freak

Total posts: 295
posted August 19, 2002 12:05 PM
congratulations!!!

uforacing51
Dirt Freak

Total posts: 349
posted August 19, 2002 12:12 PM
There is not a better feeling in the world then when you are leading and the car will go anywhere you want it to and stick. I am told that it was the best race in some time at the track because the rest of the field (11 cars total) were about a half a lap behind me, but nobody got lapped and only 3 cars fell out. It was a very competitive race.

dobber
Dirt Roller

Total posts: 5
posted August 27, 2002 12:11 AM
The way to keep your belts on are to slow down the number of revolutions: Use a small pulley on the crankshaft and larger size on the accesories. Believe me this is the only way if your turning over 5500 rpm. Their are different sizes avalable right out of the parts junkyards. Their are 3 different size stock pulleys for the crank some with 1,2 and 3 belt groves. their are 2 different sizes for pwr. steering and altnr.

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