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Bolens HT20 going Diesel

ht 20 diesel conversion

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#16 BolensChrisUK OFFLINE  

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Posted January 22, 2017 - 02:46 PM

Looks interesting. I see your logic in repowering a tractor with a blown engine. Thats what I would do if I ever found another HT which is dead.

 

I could not bring myself to cut the chassis rails. Sure I saw a guy who fitted a kubota 2 cylinder to one .

 

I will watch with interest :thumbs:



#17 blackjackjakexxix OFFLINE  

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Posted January 22, 2017 - 03:34 PM

Not questioning your choice to go diesel,the sound and performance is remarkable,nothing like a diesel,I'll also be watching this,I think your big challenge will be the hood,one of our members here is trying to work through that as we speak,he's trying to repair a damaged hood off a HDT1000,hope he will chime in

Edited by blackjackjakexxix, January 22, 2017 - 03:35 PM.

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#18 KennyP ONLINE  

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Posted January 22, 2017 - 04:43 PM

I added 4" to the hood on Alice! That was fun! Had to buy a spot weld tool to drill them out.


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#19 29 Chev ONLINE  

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Posted January 22, 2017 - 05:02 PM

Thanks for all the words of encouragement! The engine is a Petter marine diesel, don't know much about them but the engine is rated to run at 3600 rpm which I thought was pretty high for a diesel, I am anxious to here it run.

I think to make it fit I will both stretch the frame 5 inches, this line the front engine pulley with the PTO, and overhang the front by 4 inches as tractorholic suggests... don't wont to ruin the turning any more than I have to. That of course will mean a 9 inch longer hood. I have the hulk of a 1250 that will be donating frame and hood I think. 

Welcome to the forum.

 

If you stretch the frame will that not change the position of the PTO shaft in relation to any attachments (such as a tiller or deck) that connect to the rear of the PTO and as a result will you not have to lengthen the shaft on the attachment?


Edited by 29 Chev, January 22, 2017 - 05:03 PM.

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#20 bolensnut OFFLINE  

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Posted January 22, 2017 - 05:47 PM

You are correct about the pto in relationship to the attachments, it gave me lots of concern too. I will leave the factory mounts and add a front set of ears 5 inches forward which will allow front mount attachments to fit and I will lengthen the inboard pto by 5 inches therefor mid mount and rear mount attachments should still fit. I will have to make a set of front attachment lift rods with the extra 5 inches too. I am sure there will be surprises but that will be the fun part.


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#21 29 Chev ONLINE  

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Posted January 22, 2017 - 05:54 PM

I assume you have verified that the diesel engine is rotating the same direction as the engine that came out?  Just asking given the fact that you state the engine is a marine application as some marine engines run backwards.


Edited by 29 Chev, January 22, 2017 - 06:25 PM.

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#22 Austen OFFLINE  

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Posted January 22, 2017 - 08:30 PM

Cool project! The engine sits in there nicely. I'll enjoy following along and welcome to GTT! :)


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#23 bolensnut OFFLINE  

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Posted January 23, 2017 - 08:19 PM

We are supposed to get a good dump of snow tonight so I thought I should drag the donor 1250 inside so I don't have to worry about digging it out later. I had been thinking it was going to be a shame to cannibalize it as I had dreams of restoring it someday. I had not looked at is in quite a while and once I uncovered it I realized restoring it was not in the cards, poor old girl doesn't have much left. The good news is there is enough there to allow me to build this project and keep the build looking like something Bolens might have done... if there was ever a tractor built with a British marine engine 

:say_what:

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#24 dropped82 OFFLINE  

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Posted January 24, 2017 - 03:42 PM

We are supposed to get a good dump of snow tonight so I thought I should drag the donor 1250 inside so I don't have to worry about digging it out later. I had been thinking it was going to be a shame to cannibalize it as I had dreams of restoring it someday. I had not looked at is in quite a while and once I uncovered it I realized restoring it was not in the cards, poor old girl doesn't have much left. The good news is there is enough there to allow me to build this project and keep the build looking like something Bolens might have done... if there was ever a tractor built with a British marine engine
:say_what:

Kinda off the re power subject but, do you have anymore pics/info of the grapple on your loader bucket. I have an extra hydraulic spool and was wanting to build something similar.

Eric


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Edited by dropped82, January 24, 2017 - 03:42 PM.


#25 bolensnut OFFLINE  

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Posted January 30, 2017 - 08:20 AM

I highly recommend building a grapple It has been incredibly handy. I was really pretty easy to make, the fingers are 1x2 tubing with all the open ends boxed closed. The cylinder only has a 1 1/2 bore and even then I kept bending the top of the bucket until I added a frame to the inside top to reinforce it. 

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Edited by bolensnut, January 30, 2017 - 08:21 AM.

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#26 bolensnut OFFLINE  

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Posted January 30, 2017 - 08:24 AM

As we all seem to be these days I seem to have been to busy to spend much time in the shop. I have cut up the 1250, prepped the parts to put on the project and welded the frame extensions on... small steps are better than none I guess.

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Edited by bolensnut, January 30, 2017 - 08:26 AM.

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#27 bolensnut OFFLINE  

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Posted February 20, 2017 - 03:37 PM

Hey all. I have been trying to figure out how to drive the hydro, alternator and water pump from the engine flywheel. The hydro driveshaft has a 1.25" bore and the flywheel adapter is 1". I also found the adapter as installed had about .125" of run-out, I don't think it would add to reliability if left like that.

I picked up a 1.25" draw pin and a weld on pulley. After re-machining the hub with pin to run true and accept the pulley it all went together pretty nice and even better; is straight,

Now to build a mount for the accessories.

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#28 bolensnut OFFLINE  

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Posted February 20, 2017 - 07:13 PM

Today was quite productive! The accessory mount got made and the alternator and water pump now have a home. The belt I had hanging in the rafters is a bit too long but it helped with alignment and gives me a good starting point.

The chassis is back together, steering, PTO lever and hydraulic lines are all lengthened. I have the motor properly aligned and the mounts cut and clamped in place. I am trying to decide if I should weld the mounts in; much quicker but then I would not be able to take the frame rails apart without a torch. That said, I have never needed to remove a frame rail.... still not sure.

 

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#29 bolensnut OFFLINE  

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Posted February 20, 2017 - 07:15 PM

more photos

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#30 bolensnut OFFLINE  

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Posted February 20, 2017 - 07:18 PM

At the end of the day I cut an old hood and clamped it onto the tractor for further inspiration; it's going to be a beast. :bounce:  :bounce:

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