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Tractorholic
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153 Posts
Discussion Starter · #1 ·
Well I got tired of trying to get the onan to run properly so here is the solution. I needed the dimensions of the b43m before I went ahead with it, but here is what will be my new 2555.
I was luck to make the original electric clutch to fit with a custom made plate to fit the
mag part to the engine block. Then I made spacer for inside and outside to fit the crank and center the pulley on the out put shaft. I set her in place and I determined that I need raise it up to the original shaft center line, what is in there is temp until I machine larger blocks and a plate to go under the engine.

Motor vehicle Automotive exterior Nut Auto part Gas

Today I have to machine the spacer to adapt the drive spline to the new engine. I think I am going to remove and replace the double pulleys at the same time they are very worn out plus there is room to go larger with 5" pulley which will give me 1/3 more drive surface, I will not have to tighten the pulleys as much, when I pulled the old engine out the flywheel side of the engine moves up and down about 30 thousand, looking at how the belt tensioner works it put alot of down force on the front bearing of the motor, kind of stupid system especialy if the engine was not designed to do so. So anybody over doing the tension here will destroy the front bearing.
I am going to have to cut some of the hood support to fit it over the new air cleaner and build a muffler bracket to fit it under the hood. I am looking forward to the power of this thing should be FUN. LOL
 

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Super Moderator
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Looking good. Sure is nice to be able to make positive improvements. Keep up the good work.
 

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Premium Member
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The hydro drive shaft tension/belt setup on these are the worst. You gotta have the belts tight otherwise they slip too easy. Problem with that is like you said it creates unnecessary wear on the crank bearings.
 

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Connoisseur of Rusty Junk
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5,623 Posts
That looks like a great project you have going there ErnRemy! That engine looks mean! Great work on all the fitting too. Keep us posted!
 

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Elf guardian
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7,712 Posts
Is there any room/way to add a carrier bearing in front?
I know it would make belt changing a pita, but........
Just a thought.
 

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Premium Member
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Hey Ern Remy looking good.Looking at your pics brings back when I put the Honda 20 Hp V twin into my 1655.Had too do all the changes your doing now.One thing I found out after it was running etc: the first time I thru the switch for the Electric clutch for the mower the engine stopped running.Guess with the Honda motor when you turn it off it actually grds the coils ,so turning the electric clutch on did just that.A little bit of rewiring and I had it working in no time.One other thing that I did was to change the way the belt tensioner worked.I cut the pivot pin off the motor mount plate and made it pivot off the frame of the tractor instead.The reason for this was to stop the back and forth movement of the splined coupler and charge pump shaft.Since doing that change I've not ever had to deal with the coupler or shaft wearing,in fact I have the coupler set screwed to the pump shaft now.It works just as well this way as what it was made like from new.I think this is what they should have done rather then have had the belt tensioner pivot pin point on the motor mount plate.I'll be watching to see how your doing very interested in what your doing.Larry
 

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Tractorholic
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866 Posts
Looks great, that motor is a beast! Just take your time with the hood, it will make or break the job when its all done. Can you gain enough room by just making those lower bulges wider, or maybe wider and lifted up a bit? It will be a fair bit to make it look stock, but well worth it in the end!
 

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Tractorholic
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153 Posts
Discussion Starter · #8 ·
FirefyterEmt said:
Looks great, that motor is a beast! Just take your time with the hood, it will make or break the job when its all done. Can you gain enough room by just making those lower bulges wider, or maybe wider and lifted up a bit? It will be a fair bit to make it look stock, but well worth it in the end!
The hood does not need to be modified other than cutting back the inside support enough to clear the filter housing there is the rectifier on the side of the engine that needs to be moved but no big deal there. I have had the hood on it already lots of room around the engine it should cool nicely.
 

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Tractorholic
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153 Posts
Well I finally got around to doing some more work on my 2555 here is some pictures of the drive adapter that I am machining. everything is working out fine so far, except trying to figure out how to drill at 90 degrees to each other with some precision. I know that if I had a
rotatory table I could do it quite easy but hey can't have all the cool tools. I am lucky to have a cad/cam program on my computer and drafted up the exact dimensions needed to overlay it on my drive adapter then center punched the drill points.
View attachment 14594 View attachment 14590 View attachment 14595 View attachment 14590 View attachment 14606 View attachment 14604 View attachment 14605
 

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Accumulator
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That's looking good.:thumbs:
 

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Tractorholic
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Very nice job ! Are you just checking the center punch marks compared to the counterbored holes ?
 

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Tractorholic
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153 Posts
Discussion Starter · #13 ·
Alc said:
Very nice job ! Are you just checking the center punch marks compared to the counterbored holes ?
no I also drawn up a center bore diameter line as well, I finished the drilling and tapping this morning all the bolts threaded in by finger the bolt holes have only a 5thou clearance so I must have done something right
 

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Tractorholic
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Nice job getting it done . Al
 

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Red Tractor Nut & Diesel Addict
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Looking very nice Ern! I've had to make a few flywheel/shaft adapters too, and you did better with yours fitting so perfect. I've occasionally had to oblong a hole just a tad. But then being in a rush is not your best friend, so I need to go slower!
 

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Tractorholic
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153 Posts
Discussion Starter · #16 ·
SHE LIVES

LOL Never thought about the engine rap that she has now, very cool, I hammer the throttle and the machine torques side ways and has a rapp like a motor bike. I think I will post a video with sound, this machine is going to be a stump puller from hell.
 
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