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loosing the fan belt #226173
02/15/09 09:33 PM 02/15/09 09:33 PM
Joined: Jul 2005
Posts: 25
milton pa
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mikegeyer340 Offline OP
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milton pa
how do i keep the waterpump/fanbelt from turning insideout/jumping off the pulleys @ higher RPMS.
Car is a 1973 challenger with a 1970 440 with some mods. Temp was 240 when i saw it do you think i hurt it.

75 dart sport 340 ? @ ? shady dell 418 ci 73 challenger 440 12.93 @ 106 (gone)
Re: loosing the fan belt [Re: mikegeyer340] #226174
02/15/09 09:36 PM 02/15/09 09:36 PM
Joined: Nov 2007
Posts: 21,840
Kirkland, Washington
Pacnorthcuda Offline
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Are the pulleys in alignment? Is the belt the correct size? (WIDTH)??? Too wide a belt will ride too high in the pulley and not be as secure
Re: loosing the fan belt [Re: Pacnorthcuda] #226175
02/15/09 09:39 PM 02/15/09 09:39 PM
Joined: Jul 2005
Posts: 25
milton pa
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mikegeyer340 Offline OP
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milton pa
yes pulleys r in line belt is exact replacement 4 the 1 i took off this summer old belt never came off nothing else changed

5028123-challenger4.jpg (69 downloads)
75 dart sport 340 ? @ ? shady dell 418 ci 73 challenger 440 12.93 @ 106 (gone)
Re: loosing the fan belt [Re: mikegeyer340] #226176
02/15/09 09:39 PM 02/15/09 09:39 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Check the alignment of the pulleys and the alt(if
using one)... your out of alignment. Also you can
get deep pulleys for most engines, use the shortest
belt possible
EDIT
Also, check the alignment when the belt is tight,
sometimes when you pull it tight it will twist the alt

Last edited by MR_P_BODY; 02/15/09 09:44 PM.
Re: loosing the fan belt [Re: MR_P_BODY] #226177
02/15/09 09:42 PM 02/15/09 09:42 PM
Joined: Jul 2005
Posts: 25
milton pa
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mikegeyer340 Offline OP
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milton pa
the belt did squeel after i put new 1 on but never jumped til i drove her 2 day. n old belt never jumped

75 dart sport 340 ? @ ? shady dell 418 ci 73 challenger 440 12.93 @ 106 (gone)
Re: loosing the fan belt [Re: mikegeyer340] #226178
02/15/09 09:47 PM 02/15/09 09:47 PM
Joined: Jul 2005
Posts: 25
milton pa
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mikegeyer340 Offline OP
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milton pa
im going 2 go check thing out a little more 2morrow

75 dart sport 340 ? @ ? shady dell 418 ci 73 challenger 440 12.93 @ 106 (gone)
Re: loosing the fan belt [Re: mikegeyer340] #226179
02/15/09 11:00 PM 02/15/09 11:00 PM
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT Offline
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First 240 shouldn't hurt anything...Second I've cured the slinging belt/rolling belts issue on quite a few cars by adding a long bolt to the lower alternator bracket that is positioned just outside the belt path..When the RPMS go up & the belt trys to grow it touches/rubs the bolt & never gets enough growth to flip or fly off...Back in the prehistoric age it was a common fix that worked..I don't know why it isn't done by people anymore...
Re: loosing the fan belt [Re: 1_WILD_RT] #226180
02/16/09 12:54 AM 02/16/09 12:54 AM

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Anonymous
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What kind of fan are you running?
Re: loosing the fan belt [Re: ] #226181
02/16/09 01:02 AM 02/16/09 01:02 AM
Joined: Oct 2004
Posts: 3,097
back in Georgia
dthemi Offline
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try a cogged V belt. Try a top cog and if twists try a bottom cog.
Re: loosing the fan belt [Re: dthemi] #226182
02/16/09 03:05 AM 02/16/09 03:05 AM
Joined: Oct 2003
Posts: 7,143
my own world
theraif Offline
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Had that issue would carry exta belts in the car till one day i pull the alt off the 69 new yorker and havent did it since befor that it was a new napa alt
Re: loosing the fan belt [Re: dthemi] #226183
02/16/09 05:53 AM 02/16/09 05:53 AM
Joined: Jan 2003
Posts: 8,180
Detroit, MI
CokeBottleKid Offline
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Detroit, MI
Quote:

try a cogged V belt. Try a top cog and if twists try a bottom cog.




The Dayco topcog belts I think they're called are the cure. I had the same problem with my old 496, perfect belt alignment but the damn thing would turn belts inside out the first time you flogged on it. Ended up buying one of those top cogs (had used them on a 318 previously) and no more jumping . It did squeal every time you free revved it though, I just attributed it to the fact I powder coated my pulleys

Re: loosing the fan belt [Re: mikegeyer340] #226184
02/16/09 10:16 AM 02/16/09 10:16 AM
Joined: Jan 2008
Posts: 1,213
Minn
S
SportF Offline
pro stock
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If it ran very long in the upside down or twisted way it may take that set and do it everytime reguardless. May want to go with a new belt, as recommended above.
Re: loosing the fan belt [Re: SportF] #226185
02/16/09 10:39 AM 02/16/09 10:39 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Quote:

If it ran very long in the upside down or twisted way it may take that set and do it everytime reguardless. May want to go with a new belt, as recommended above.



If the belt twisted upside down... its a throw away,
there's only 1 thing that can flip a belt... thats
misalignment where the belt is loaded on one side of
the pulley. I make my own pulleys for my crank and alt,
I do like to make them a little deeper
Re: loosing the fan belt [Re: SportF] #226186
02/16/09 02:57 PM 02/16/09 02:57 PM
Joined: Jan 2003
Posts: 2,158
Hamilton,Ohio
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POZEST Offline
top fuel
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Hamilton,Ohio
Quote:

If it ran very long in the upside down or twisted way it may take that set and do it everytime reguardless. May want to go with a new belt, as recommended above.


Re: loosing the fan belt [Re: POZEST] #226187
02/16/09 03:48 PM 02/16/09 03:48 PM
Joined: Jan 2004
Posts: 368
Detroit,MI
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BADDART Offline
enthusiast
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Detroit,MI
My belt was jumping off after the new engine went in.Same pulleys,belt,etc.Went from rb to low deck.
I found the alignment to be off about 1/8".Alt was slightly crooked.Could not see it with your eyes,had to use a straight edge.It only took one washer under the front two alt bracket mounts to cure the problem.Also,you stated this problem happened after a new belt went on.The old worn belt probably sat deeper in the groove and covered up the alignment issue. Chris
Re: loosing the fan belt [Re: BADDART] #226188
02/16/09 06:26 PM 02/16/09 06:26 PM
Joined: Jul 2005
Posts: 25
milton pa
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mikegeyer340 Offline OP
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milton pa
thanks guys i didnt make it 2 the garage 2day but i will get another new belt n check alignment.
I have no idea what fan is on it the car is the way i bought it 2 years ago except 4 a gear swap.

75 dart sport 340 ? @ ? shady dell 418 ci 73 challenger 440 12.93 @ 106 (gone)
Re: loosing the fan belt [Re: mikegeyer340] #226189
02/16/09 08:27 PM 02/16/09 08:27 PM
Joined: Oct 2005
Posts: 1,927
Seaford, Va
Kindafast Offline
top fuel
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I had that problem last year. I found out my harmonic balancer had a crack in it at the snout. The balancer would wobble at high rpms. You might want to check it .

6.50 @105.26
Re: loosing the fan belt [Re: Kindafast] #226190
02/17/09 01:57 AM 02/17/09 01:57 AM
Joined: Jan 2003
Posts: 27,421
Balt. Md
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383man Offline
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Yes throw the belt away and get a new one. I found out the hard way that once a belt has thrown it will keep doing it even if you fix the problem and the belt looks good. Ron
Re: loosing the fan belt [Re: 383man] #226191
02/17/09 02:48 AM 02/17/09 02:48 AM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
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Quote:

Yes throw the belt away and get a new one. I found out the hard way that once a belt has thrown it will keep doing it even if you fix the problem and the belt looks good. Ron




Does the same apply to serp belts?

**Photobucket sucks**
Re: loosing the fan belt [Re: 70Cuda383] #226192
02/17/09 08:41 AM 02/17/09 08:41 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Romeo MI
Quote:

Quote:

Yes throw the belt away and get a new one. I found out the hard way that once a belt has thrown it will keep doing it even if you fix the problem and the belt looks good. Ron




Does the same apply to serp belts?



Holds true on any belt but you will see the effect
less with the serp belt(greater surface area). If you
lay the belt on its side and it has a arc in it, its
bad. The arc tries to steer the belt and pitch it off
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