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Simplicity 725 Repower


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#1 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 07:00 AM

I have a 1962 Simplicity 725 it's the Montgomery ward badged Squire. The 7.25 HP Briggs and Stratton engine has a spark issue I just can't seem to overcome. While searching for forums to find some help on this issue I ran across a forum in which a guy said he'd like to see a diesel mod of one of these tractors. Well I'm a diesel mechanic and enjoy metal fabrication as well as all the work my many attachments do. So in short "challenge accepted" I have the engine and my 1962 is going to have a 10hp diesel transplant.

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#2 jms180 ONLINE  

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Posted May 18, 2014 - 07:32 AM

Welcome to the site. Sounds like a great project. We like pictures.



#3 superaben OFFLINE  

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Posted May 18, 2014 - 08:23 AM

What type of diesel is going in?

 

Ben W.



#4 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 08:24 AM

uploadfromtaptalk1400419307907.jpg in the foreground you can see the new diesel engine. In the background I have the tractor raised to modify the engine pan. I will post more soon. I predict this will take me about two weeks due to time and funds.

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#5 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 08:28 AM

It's the Chinese Myanmar clone there are lots of YouTube videos of this engine. And the rpm range is the same as the 725. The torque is higher and physical size is very close. I'll try to update as I go in case someone else would like to revive their tractor as well.

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#6 boyscout862 ONLINE  

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Posted May 18, 2014 - 09:35 AM

Welcome to the site. Watch your rotation. I have a 725 that the guy got the rotation wrong. He was so pissed that he sold me the tractor for $40. You may have issues with room for the engine. Good Luck, Rick


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#7 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 09:49 AM

The rotation is correct, and the crankshaft diameter and length are correct as well. The crank height is perfect when the plate spacers are removed.

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#8 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 09:50 AM

I'm having a machine shop make the coupler to connect the flywheel to the driveshaft.

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#9 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 10:00 AM

BTW I may be spending a lot on this project however considering the collection of implements I have. And the fact that there is nothing built today that compares to the compact power of this tractor I think it's money well spent. I have the snow thrower
Mower deck
Rear tiller
Under body grader
Snow/Doser blade
Mold bore plow
duel rear wheels
Front and rear counter weights
Wheel weights
And tire chains.

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#10 VintageIronCollector ONLINE  

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Posted May 18, 2014 - 10:18 AM

BTW I may be spending a lot on this project however considering the collection of implements I have. And the fact that there is nothing built today that compares to the compact power of this tractor I think it's money well spent. I have the snow thrower
Mower deck
Rear tiller
Under body grader
Snow/Doser blade
Mold bore plow
duel rear wheels
Front and rear counter weights
Wheel weights
And tire chains.

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Got some nice attachments for your 725. Seems to be a year-round tractor with all of those attachments.



#11 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 10:31 AM

I believe the diesel addition is going to be well worth it in the long run. Electric start. Glow plug. Should still be able to rope start thanks to the decompression valve. @ 3000 rpm this motor will provide equal HP to that of the 725 Briggs with more torque. Equalling less power loss and I'll have an additional 600 rpm if needed pushing up to the 10hp rating. And approximately half the fuel consumption. I'm not an environmentalist but this project wreaks of recycling and that makes me feel green.

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#12 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 02:03 PM

uploadfromtaptalk1400439738826.jpg uploadfromtaptalk1400439759399.jpg uploadfromtaptalk1400439776510.jpg uploadfromtaptalk1400439791008.jpg here are some before pictures.

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#13 Jeremy Jacobson OFFLINE  

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Posted May 18, 2014 - 03:54 PM

uploadfromtaptalk1400446401268.jpg the height of the crank as you can see is the same. And both engines spin ccw.

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#14 Jeremy Jacobson OFFLINE  

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Posted May 23, 2014 - 12:05 PM

uploadfromtaptalk1400864637291.jpg uploadfromtaptalk1400864657523.jpg the hub that will join my new diesel engine to my old tractor.

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#15 Jeremy Jacobson OFFLINE  

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Posted May 23, 2014 - 09:34 PM

uploadfromtaptalk1400898829465.jpg uploadfromtaptalk1400898847064.jpg uploadfromtaptalk1400898860865.jpg uploadfromtaptalk1400898876921.jpg uploadfromtaptalk1400898894500.jpg uploadfromtaptalk1400898907376.jpg

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