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John Deere Tractors Discussion Forum
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5-2 Powerblock in a '46?

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02XLT4X4

10-16-2007 19:30:16




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I have a line on a 5-2 Powerblock for a John Deere B. A little research shows this is for the 1947-1950 B. But we have a 1946 model that could use a overhaul, and heck while we are there it would be kind of fun to stick this powerblock in if it would work without too much of a hassle. Just eyeballing the block's boltpattern looks similar if not the same, aside from the water manifold that looks like is different is there any other reason this wouldn't go together?

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buickanddeere

10-17-2007 20:41:58




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-16-2007 19:30:16  
LP pistons from a 50, Roberts cam, five angle valve and seat job, blend the valve bowl rough spots/edges, port match the manifolds to the head & a dry air cleaner conversion. A gasoline manifold if you can find one. Leave the power-bloc for a newer tractor. There can be lots more putt in yours.Nothing like speaking quietly & carrying a big stick.



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02XLT4X4

10-17-2007 10:11:36




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-16-2007 19:30:16  
Given the work involved and that it will be a weaker tractor afterwards I don't think it is worth it for this tractor. Really whatever it has for power now is enough to do what it needs too, a little more never hurt thoughthird party image.



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Mike M

10-17-2007 09:40:06




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-16-2007 19:30:16  
It has been done before.

For a working tractor you can also bore out your original block to accept the 4 11/16" pistons from a later B. If you you still have the old all fuel pistons in your B you will notice a BIG !!! improvement. Or reproduction GAS pistons for your model may also be found and will give similar results.



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02XLT4X4

10-17-2007 08:10:17




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-16-2007 19:30:16  
No it isn't for pulling, it is still a working machine. Since I could get it for cheap I was just pondering how it would go in if at all, mainly just for the neat factor when I restore it and a little more power.



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jd b puller

10-17-2007 09:44:30




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-17-2007 08:10:17  
See WTW's post. Pay particular attention to the part about not having all the bolts installed. On the early styled tractors, they used the block as a part of the frame structure. If you're going to be doing anything heavy with it, such as cultivators, cornpicker, etc. Might have issues with things such as plowing just for those instances when you cross the furrow it puts quite a jolt on things. You'll need to find a 47-52 water manifold, and cut the ear off of it so everything will fit thru there. Then you'll have to cobble something together to make the hoses work - I was thinking that you just need to get a new upper rad hose. Rear flange is the same, as is the head pattern.

If you can get if for "cheap" make sure it's not a leaker, as the o-rings sometimes leak that hold the sleeves in. I've been told that KW block sealer will resolve that, but never tried it myself. Also, make sure it isn't worn out, then you'll need to overbore and put bigger pistons in it. Good luck finding oversized PB pistons. You can use Lycoming pistons, but then you'll need to modify your rods to get the length right and adjust the wrist pin down to 1.125". Good luck.

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WTW

10-17-2007 07:36:25




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-16-2007 19:30:16  
Sir, A 5-2 Power-Block has the same rear and front bolt patterns as the 5-1 block (correct block for your application). The differences is the water manifold shape and bolt pattern, Lack of frame mounting bolt holes in in rear flange of block to bolt rear of side of frame to and lack of frame mounting bolt holes in in bottom of block to bolt bottom of frame rail to. I have drilled and taped the bottom holes in the 5-2 block for frame but it is important not to drill to deep. There is not enough casting in the rear flange to drill and tap side frame holes, they will have to be left out. If you plan on mounting any implements like cultivators or loaders I would not recommend doing this. For pulling you can get by. The only other thing you will have to do is make a custom oil fitting and tap threads into the back of block for oil passage for pressure fed rocker oil line connection. Good Luck DW

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jdjerry

10-17-2007 04:59:22




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 Re: 5-2 Powerblock in a '46? in reply to 02XLT4X4, 10-16-2007 19:30:16  
I am not too sure about the B but the difference in the A powerblocks is the bolt pattern. I would have to go look to be sure but I think the one has a different bolt pattern on the bottom of the block ant the other is a totally different bolt pattern from the rest of the A blocks.



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