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Resizing v belt #4738493
04/25/18 02:29 PM
04/25/18 02:29 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline OP
RichardS  Offline OP
Joined: Jan 2017
Posts: 632
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.


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
Re: Resizing v belt [Re: RichardS] #4738503
04/25/18 02:42 PM
04/25/18 02:42 PM
Joined: Mar 2018
Posts: 61
Missouri
Oily_Thing Offline
Oily_Thing  Offline
Joined: Mar 2018
Posts: 61
Missouri
Sounds like a geometry problem. I suck at math, so maybe someone else will comment with the right answer.


2013 Cadillac XTS4 3.6
2015 Dodge Durango Limited 3.6
2011 Kawasaki Vulcan Voyager 1700
Re: Resizing v belt [Re: Oily_Thing] #4738507
04/25/18 02:48 PM
04/25/18 02:48 PM
Joined: Aug 2002
Posts: 14,456
Silicon Valley
PandaBear Offline
PandaBear  Offline
Joined: Aug 2002
Posts: 14,456
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

Last edited by PandaBear; 04/25/18 03:16 PM.

"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Resizing v belt [Re: RichardS] #4738521
04/25/18 02:55 PM
04/25/18 02:55 PM
Joined: May 2006
Posts: 759
Portland, Oregon
Joshua_Skinner Offline
Joshua_Skinner  Offline
Joined: May 2006
Posts: 759
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.


2015 Nissan Frontier S King Cab, 2.5L, 5MT
Pennzoil Platinum 5W-30 in the crankcase. Red Line in the gearboxes.
Re: Resizing v belt [Re: RichardS] #4738522
04/25/18 02:55 PM
04/25/18 02:55 PM
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de

Last edited by Trav; 04/25/18 02:58 PM.

ASE L1, Master. Deutsch Meisterbrief.
Re: Resizing v belt [Re: RichardS] #4738589
04/25/18 03:43 PM
04/25/18 03:43 PM
Joined: Jun 2003
Posts: 17,493
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,493
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.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Resizing v belt [Re: RichardS] #4738630
04/25/18 04:25 PM
04/25/18 04:25 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline OP
RichardS  Offline OP
Joined: Jan 2017
Posts: 632
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
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG
Re: Resizing v belt [Re: RichardS] #4738632
04/25/18 04:26 PM
04/25/18 04:26 PM
Joined: Sep 2004
Posts: 7,609
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,609
Marshfield , MA
Re-use the old pulley

Last edited by andyd; 04/25/18 04:28 PM.

'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Resizing v belt [Re: RichardS] #4738634
04/25/18 04:28 PM
04/25/18 04:28 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline OP
RichardS  Offline OP
Joined: Jan 2017
Posts: 632
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
Re: Resizing v belt [Re: RichardS] #4738638
04/25/18 04:33 PM
04/25/18 04:33 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline OP
RichardS  Offline OP
Joined: Jan 2017
Posts: 632
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
Re: Resizing v belt [Re: RichardS] #4738759
04/25/18 06:42 PM
04/25/18 06:42 PM
Joined: Jun 2003
Posts: 33,282
ME
eljefino Online content
eljefino  Online Content
Joined: Jun 2003
Posts: 33,282
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.

Re: Resizing v belt [Re: RichardS] #4738806
04/25/18 07:22 PM
04/25/18 07:22 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline OP
RichardS  Offline OP
Joined: Jan 2017
Posts: 632
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
Re: Resizing v belt [Re: RichardS] #4738969
04/25/18 09:00 PM
04/25/18 09:00 PM
Joined: Jul 2013
Posts: 1,753
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,753
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.


Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: Resizing v belt [Re: RichardS] #4739032
04/25/18 09:43 PM
04/25/18 09:43 PM
Joined: Dec 2016
Posts: 6,466
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,466
Waco, TX
What method is available to adjust the belt tension?!?!?!!?


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Resizing v belt [Re: RichardS] #4739786
04/26/18 04:32 PM
04/26/18 04:32 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline OP
RichardS  Offline OP
Joined: Jan 2017
Posts: 632
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
Page 1 of 2 1 2

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