john deere b crankshafts

[mrhud]

i have a b82051 that has a crank that is realy bad would have to be welded i have a b 212731 that is going to scrap unless i can use the rods and crank in the hand start early b any know the differances. thanks Hudco

 

[Paul_IN]

Although I don’t have each to examine side by side I expect the late B crank will not work in your early styled B because of differences in the clutch. The early B clutch pulley is narrower and I'm guessing the crank is a little bit shorter.

 

[buickanddeere]

Have the crank welded and ground as a stroker

 

[41B-boy]

B&D,
I have no dog in this fight, but would you be so kind as to explain that? What exactly IS a stroker, and how does it matter.
Just hoping to learn something. Unfamiliar terms to me...

Thanks, Fr. Bob

 

[mrhud]

just want it done and gone not biulding a puller

 

[mrhud]

rods are poured babbit but they can easily be machined to fit a snap in bearing shell

 

[Fixingfarmer]

It will not fit had to help someone last year put the old crank back in we tried the reverse new to older styled but I kept the crank on a pallet that didn’t fit. Which casting number did you need?

 

[Loosehandle]

Have the crank welded and ground as a stroker

I'm guessing that it's the clutch disc splines that are bad, weak spot in a mid B

 

[Fixingfarmer]

 

[Fixingfarmer]

The clutch mechanism is different as well that’s laying on the pallet next to it since this one was tighter he was going to try to use it but it didn’t fit and wouldn’t work till we switched it back

B1308r is what appears to be cast into this one

 

[mrhud]

its about .040 oval shaped on the rod jounals it was ran with a broken oil line going to the govenor and ruined it thats re done now the crank needs done to finish it

 

[mrhud]

dont know that it is all buttoned up and out back in the bone yard iwill guess by the sn crank would be ab592r nicetractor all new rubber on spokes good origanal paint no dents the owner died about five years ago

 

[JOCCO]

Ok sir there are basically 3 cranks for the B unstyled early, mid production 1941-1947 and late 1948-1952. They will not easily interchange, (unless you are building a custom stroker modified machine) Try to find one with the same casting number as yours. As old as they are you may need to have it ground but still cheaper than welding one up. Al so the first two mentioned ones take babbitt rods and shims The last takes inserts. You may need to have the rod journals done too. There are some exceptions.

 

[mrhud]

the one i have is a 1940 the doner parts are1948 so the doner will go to scrape and i wil have to look for a crank

 

[Fixingfarmer]

Yep that sounds like the same issue this guy had almost down to the year and this one I have likely won’t help

 

[JOCCO]

If you have the means to have one ground look on evil bay. You might find one that is good as is. Also beweare that the splines on both ends are as big of an issue as journals. Also on your rods same thing might be cheaper to find one than do rebabitt and recondition. Those 1939/40 B were nice mine was a 4 speed.

 

[used red MN]

B&D,
I have no dog in this fight, but would you be so kind as to explain that? What exactly IS a stroker, and how does it matter.
Just hoping to learn something. Unfamiliar terms to me...

Thanks, Fr. Bob

Fr. Bob, this video will explain it starting at about 6:30. A “stroker” crank increases the distance the piston travels back and forth aka the stroke. In most cases the rod center to center length has to be shortened or a piston purchased that has a higher position for the wrist pin in relation to the piston top to accommodate the stroke change. Crankshaft welding and stroking video

 

[41B-boy]

Fr. Bob, this video will explain it starting at about 6:30. A “stroker” crank increases the distance the piston travels back and forth aka the stroke. In most cases the rod center to center length has to be shortened or a piston purchased that has a higher position for the wrist pin in relation to the piston top to accommodate the stroke change. Crankshaft welding and stroking video

much appreciated!