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John deere B crank

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ben haag

09-26-2002 18:48:59




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is a crank for my 1952 john deere b the same as a john deere power block crank?? cna i interchange them??




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WTW

09-27-2002 07:23:13




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 Re: John deere B crank in reply to ben haag, 09-26-2002 18:48:59  
ben, There is no such thing as a "Power-block crank" There is a total of 4 different cranks used in all the "B" series tractors. There is only two different strokes among all four. 1938 and older tractors had a 5.25" stroke and the remaining three cranks all had 5.5" stroke. The big stroke "pulling" cranks are custom altered and are done at machine shops. Time and money will put you about any size you want in your tractor up to the point where you run out of room for it. All "B" cranks can be interchanged with a little work. The later, number four crank, will not gain you anymore stroke than the number two or three will. Tell me what you want to do and I will try to give you some ideas and options. I do a little pulling with a couple of slightly altered "B" John Deere's. Good Luck, Dave W.

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BushogPapa

09-27-2002 07:19:26




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 Re: John deere B crank in reply to ben haag, 09-26-2002 18:48:59  
The cranks are the same...

The power Block gives the "B" a 5" Bore..!!

I wonder how well they start...Our "B" has a High Altitude head, and a +.180 over-bore, and it will not start, without opening the pet-cocks..!! Been that way, since 1960...!!! It would be nice to see how much MORE power it would have with the 5" Block....!!



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WTW

09-27-2002 12:17:07




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 Re: Re: John deere B crank in reply to BushogPapa, 09-27-2002 07:19:26  
My two "B's" both have bored out .125 over 5" Powerblocks. One has 1.5 inch stroke yielding 278 cubic inch 10 to 1 compression. I start it by hand. No compression releases. The other is allot bigger 11 to 1 compression start it with Cummins diesel starter. No compression releases in it either.



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BushogPapa

09-27-2002 19:05:39




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 Re: Re: Re: John deere B crank in reply to WTW, 09-27-2002 12:17:07  
Do you just pull them, or work them...????

I bet they are impressive...!!

I especially like pulling a couple of tons over these hills...!! At about half way up, the front end starts jumping, and I have to throttle back to let it settle down...!!! Both rear tires are fully loaded, and I have a Co-Op loader on it...Blade for the earth-moving jobs, etc...Bucket for the manure...



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ben

09-29-2002 19:31:01




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 Re: Re: Re: Re: John deere B crank in reply to BushogPapa, 09-27-2002 19:05:39  
well i have that john deere B... It has 15.5 x 38 tin rears... IT has a .125 over bore in a standard block. i have a power block for it.. I want to change pistons, sleeves, and crank to the power block. will the crank fit right in??? you guys think thats impressive.. we have a john deere a pusshin twice what a G does and it still has a stock carb and maniflod!! it barks,, everytime i pull it, it acts like i is gonna dye then the power band kicks in and that tractor can be herd for miles!!! it has dual 6 inc semi stack outta the hood... I pull the john deere B... but i need to het the power block in... any suggestions or ideas let me know..

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