John Deere A 8 inch stroker crank issues

kyle m

Member
I am looking for some help here with a 44 John Deere A I am installing a 8 inch stroke crank into. I am having some clearance issues and would like to talk to someone here who has built this set up before. Especially looking for information on what people used for a rod setup. Any help is greatly appreciated. Thanks
 
(quoted from post at 11:13:57 08/30/15) I am looking for some help here with a 44 John Deere A I am installing a 8 inch stroke crank into. I am having some clearance issues and would like to talk to someone here who has built this set up before. Especially looking for information on what people used for a rod setup. Any help is greatly appreciated. Thanks

Using stock rods and an 8" stroke at a minimum requires clearance at the transmission wall. To avoid grinding through the wall, the rods can be c-bored some at the rod bolt and not grind so much in the crankcase. The sides of the rods can also be "polished" to clear the camshaft. Just don't get carried away. Also, you will need to check under the governor and over the pressure regulator. Since its so much work anyway, I decided to just go ahead and put in a 9" stroke. Now, if your going to use a 6-1/2 or 6-3/4" bore, then with the increased dia and spread on the cylinder spacing there is a lot more grinding to fit the cylinder case into the crankcase. This isn't complicated, just brute force, grinding wheels, flap discs, and a whole lot of cleaning. Get some good, tight fitting dust masks, a clean clear grinding shield and expect to spend the better part of a week grinding, checking, cleaning, grinding, checking, cleaning...
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Thanks for the reply. All is good now. Had to clearance more from the
rods than I figured. It makes a complete revolution with no
interference. Thanks
 
couldn't a guy drill and tap use 3/4 fine thread bolts ? Been thinking of doing this set up . How big a bore you going with ?
 
Bore size is .125 over on a stock block. Can't recall exact finish bore size but I can measure let you know. As far as bolts I found out some are using socket head bolts.
 
I have built several A's 7.5 to 9". An 8" x 5.75" should make a good 75 hp. If you want to talk or are looking for help I would be more than willing.
 
(quoted from post at 20:50:19 09/02/15) I have built several A's 7.5 to 9". An 8" x 5.75" should make a good 75 hp. If you want to talk or are looking for help I would be more than willing.

Do you have any videos on these builds you've done? I'm in the drawing board phase of a project like this and am looking for all the info I can to make educated decisions.
 

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