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#4549652 - 10/20/17 08:47 PM How much will a v belt stretch?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
In have an old Exmark 21" mower where the self propel belt keeps coming off. I'm trying to decide if its the belt that's worn out and stretched or the grooved pulleys worn out.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4549658 - 10/20/17 08:49 PM Re: How much will a v belt stretch? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
The belt is completely cracked and doesn't even look like it's a v belt anymore. Lol I have the pulleys to replace, but I'm afraid it will be too much trouble to replace them.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4549661 - 10/20/17 08:52 PM Re: How much will a v belt stretch? [Re: motor_oil_madman]
eljefino Offline


Registered: 06/15/03
Posts: 32631
Loc: ME
Quite possible it's the pullely where they're down there getting blasted by sand. A new belt should fit only on the sides, it should not be "bottoming out".

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#4549672 - 10/20/17 09:04 PM Re: How much will a v belt stretch? [Re: motor_oil_madman]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
My mom's Kia Spectra had a "V" belt for the alternator and it kept squealing and then one winter it popped off all together.
Turned out the two pulleys were off alignment slightly causing it to rub. Replaced the Alternator Pulley and all we well.

Check for perfectly straight alignment with a sharp straight edge against the side sides of the pulleys.
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'15 Dodge Journey - 90,000 KM's - SSO 5w20
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#4549761 - 10/20/17 11:22 PM Re: How much will a v belt stretch? [Re: StevieC]
earlyre Offline


Registered: 11/22/11
Posts: 3857
Loc: Lima, Ohio, USA
Originally Posted By: StevieC
My mom's Kia Spectra had a "V" belt for the alternator and it kept squealing and then one winter it popped off all together.
Turned out the two pulleys were off alignment slightly causing it to rub. Replaced the Alternator Pulley and all we well.

Check for perfectly straight alignment with a sharp straight edge against the side sides of the pulleys.


sounds like my old sonata,at one point the generator belt was down to what looked like a frayed hairy rubberband.

one shop replaced both belts 3 times in 6mos, cuz they kept squealing. they finally gave up on the parts store belts, and ordered the OE part from the dealer. it never squealed again.
_________________________
Mine:
09 Mercury Sable : 6qts AutoQuest(Meijer/Warren) 0w20, WIX 51516
Mine to Maintain:
03 Pontiac Vibe : 4.5qts VWB 5w30,WIX 51394

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#4549972 - 10/21/17 08:56 AM Re: How much will a v belt stretch? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
Last time I checked the pully on the crank is held on by a set screw. Is it pressed on also?
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4549988 - 10/21/17 09:16 AM Re: How much will a v belt stretch? [Re: motor_oil_madman]
JTK Offline


Registered: 08/14/03
Posts: 10559
Loc: Buffalo, NY
Originally Posted By: motor_oil_madman
Last time I checked the pully on the crank is held on by a set screw. Is it pressed on also?


If not, it will likely act as if it's pressed on now. Depending on the age of the mower and amount of corrosion, they can be a real pain to remove short of cutting them off with a grinder.
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2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)

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#4550022 - 10/21/17 09:52 AM Re: How much will a v belt stretch? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
Well then I'll throw a new belt on and sell it. Just wondering how difficult it would be since I already have the parts I bought a while back.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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