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#4738493 - 04/25/18 02:29 PM Resizing v belt
RichardS Offline


Registered: 01/14/17
Posts: 632
Loc: Melbourne, Florida
I use a ride on leave spreader at work thatís powered by a Subaru ea190v

Thanks to a catastrophic failure that destroyed the ignition coil, I had to bolt on a new one. The old pulley that was on the shaft out of the motor was well rusted on, so I just replaced that as well, but with a slightly smaller pulley.

I went from a 3.75Ē pulley to a 3.50Ē pulley, causing the belt to be a pinch too loose.

I have no freaking idea how to size a new belt. So I just get one that .25Ē smaller? I feel like thatís the right answer, but donít want to play a guessing game buying a bunch of belts to see what works. Itís fertilizer season, and Iíd like it to be right the first time.
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2008 Dodge Caliber SE 2.0 117k
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#4738503 - 04/25/18 02:42 PM Re: Resizing v belt [Re: RichardS]
Oily_Thing Offline


Registered: 03/16/18
Posts: 46
Loc: Missouri
Sounds like a geometry problem. I suck at math, so maybe someone else will comment with the right answer.
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#4738507 - 04/25/18 02:48 PM Re: Resizing v belt [Re: Oily_Thing]
PandaBear Offline


Registered: 08/05/02
Posts: 14379
Loc: Silicon Valley
Originally Posted By: Oily_Thing
Sounds like a geometry problem. I suck at math, so maybe someone else will comment with the right answer.


If you know the amount of contact on the circumference the belt land on, yes, but it is probably easier to just look up the application with that new pulley size and get the belt it goes with.

Why did you downsize the pulley? Was it from another engine on the same block? If yes then you should look up the belt that engine use and buy it. I'd trust that approach more than just keep trying till you find a right size.

delete my wrong calculation


Edited by PandaBear (04/25/18 03:16 PM)
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#4738521 - 04/25/18 02:55 PM Re: Resizing v belt [Re: RichardS]
Joshua_Skinner Offline


Registered: 05/08/06
Posts: 754
Loc: Portland, Oregon
Half the circumference of the 3.75" pulley is 5.9". Half the circumference of the 3.5" pulley is 5.5" so I would get a 1/2" shorter belt.
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#4738522 - 04/25/18 02:55 PM Re: Resizing v belt [Re: RichardS]
Trav Offline


Registered: 11/20/06
Posts: 19639
Loc: MA, Mittelfranken.de


Edited by Trav (04/25/18 02:58 PM)
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#4738589 - 04/25/18 03:43 PM Re: Resizing v belt [Re: RichardS]
Chris142 Offline


Registered: 06/05/03
Posts: 17118
Loc: Deplorable in apple valley, ca
Use rope. Measure how long it needs to be in inches then find a belt that long and the correct width.
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#4738630 - 04/25/18 04:25 PM Re: Resizing v belt [Re: RichardS]
RichardS Offline


Registered: 01/14/17
Posts: 632
Loc: Melbourne, Florida
I went with the smaller pulley, because it was the closest size available that fit on a 7/8Ē drive shaft that was available locally.

Had I known quite what I was doing, I would have ordered a pulley when I ordered the replacement motor.

This is the 3rd motor for this machine, so I donít think the original info regarding the belt would apply. The OE motor was a Honda, the second (and now third) are both Subaruís. I donít know that the pulley on the previous Subaru came off the original Honda motor, or if it was added when the motor was swapped.

The motor directly tethers to the gearbox to drive the rear wheels via this belt. The belt that is on there almost fits. Itís able to transfer some of the motors spin to the transmission on the spreader, but even with the belt tensioner, itís just slightly too loose to spin at the same rate, and therefor doesnít give me the necessary torque to move forward without the belt slipping and overheating the pulley on the drive shaft.

Joshua, thank you! I had a feeling my math was too simple to be correct.

Just as an FYI, because I feel like the question is bound to come up: it went through 2 motors in 9 years because my predecessor didnít believe in changing oil on OPE, or any other basic maintenance, so they got ran into the ground on their first fill, and then replaced. Though I started following the 50 hour OCI in the handbook, 4 years on its first fill surely did its damage. Anyway, the second motor bought the farm when a magnet came loose and made contact with the flywheel, shredding things as it fired out from the protective cover.
_________________________
2008 Dodge Caliber SE 2.0 117k
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2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

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#4738632 - 04/25/18 04:26 PM Re: Resizing v belt [Re: RichardS]
andyd Offline


Registered: 09/25/04
Posts: 7433
Loc: Marshfield , MA
Re-use the old pulley


Edited by andyd (04/25/18 04:28 PM)
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#4738634 - 04/25/18 04:28 PM Re: Resizing v belt [Re: RichardS]
RichardS Offline


Registered: 01/14/17
Posts: 632
Loc: Melbourne, Florida
Trav,
Thank you! Iíll take a look at those, and hopefully itíll pan out.
_________________________
2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

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#4738638 - 04/25/18 04:33 PM Re: Resizing v belt [Re: RichardS]
RichardS Offline


Registered: 01/14/17
Posts: 632
Loc: Melbourne, Florida
AndyD,
Trust me, Iíd have loved to. But hours of hammering, pulling, and a night bathed in penetrating oil wouldnít free up the pulley or key, so I surpassed my abilities with the tools available.

If youíre a snowbird, and down this way for the winter, Iíd be glad to DM you the address to give you a crack at it!
_________________________
2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

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#4738759 - 04/25/18 06:42 PM Re: Resizing v belt [Re: RichardS]
eljefino Offline


Registered: 06/15/03
Posts: 32883
Loc: ME
Cut the old belt at a 45 degree angle then cut little bits off it until the new one fits. Duct tape it together and bring it to NAPA to compare to new ones.

If you can read the number of the old one that will give you a starting point. Remember you want a belt to ride on the upper sides of the pulley and not bottoming out.

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#4738806 - 04/25/18 07:22 PM Re: Resizing v belt [Re: RichardS]
RichardS Offline


Registered: 01/14/17
Posts: 632
Loc: Melbourne, Florida
Eljefino,
Thankfully I have spare belts of the current size, as I doubt anything on the belt currently in service could still be readable. Iíll havw to give your method a go if the - 1/2Ē doesnít do the trick. Since thereís a tensioner pulley, Iím not sure how snug it needs to be without that tensioner tightening it up

I donít understand the description of where the belt should ride. The groove the belt rides in is exactly sized to match the size/shape of the belt.
_________________________
2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

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#4738969 - 04/25/18 09:00 PM Re: Resizing v belt [Re: RichardS]
jhellwig Offline


Registered: 07/01/13
Posts: 1595
Loc: Ottumwa, Iowa
Originally Posted By: RichardS
AndyD,
Trust me, Iíd have loved to. But hours of hammering, pulling, and a night bathed in penetrating oil wouldnít free up the pulley or key, so I surpassed my abilities with the tools available.

If youíre a snowbird, and down this way for the winter, Iíd be glad to DM you the address to give you a crack at it!


If the motor is junk cut the shaft off behind the pulley then drive it out easy as pie.
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#4739032 - 04/25/18 09:43 PM Re: Resizing v belt [Re: RichardS]
Linctex Offline


Registered: 12/31/16
Posts: 6189
Loc: Waco, TX
What method is available to adjust the belt tension?!?!?!!?
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#4739786 - 04/26/18 04:32 PM Re: Resizing v belt [Re: RichardS]
RichardS Offline


Registered: 01/14/17
Posts: 632
Loc: Melbourne, Florida
Jhellwig,
I lack the tools necessary to quickly, or easily, cut through that much steel. Iíd have to hacksaw it, and I donít have that in me.

Linctex,
None that I could see. Thereís a tensioner/guide that isnít adjustable, and both pulleys are not able to be moved farther away from each other to take up the slack.
_________________________
2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

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