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John Deere Tractors Discussion Board

1939 John Deere B question. engine rebuild help needed

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Posted by Jonathan Gurley on July 01, 2013 at 00:48:27 from (

Ok guys,, long story short, me and my dad bought a restored(repainted) 1939 john deere B from a family friend,, tractor ran perfect ,, well after a couple weeks I went out to start the tractor and some shuttered when tractor first started then tractore shut off,, to skip ahead I pulled the crankcase vent cover off and low and behold the left piston and rod are laying in the bottom of crankcase,, they are both ruined,, the left cylinder skirt is ruined, it appears that over time or some time in the last 50 years somebody either didn't put any cotter pins in the nuts of the connecting rod or they fell out, there was no cotter pins in either connecting rod of the two and we think a nut backed off the rod bolt and finally turned loose,,we found one bolt laying in the crankcase untouched, it could have ran for years with only one rod bolt as far as we know.. ,,, so here is my question, the right side piston, rod etcetc is fine,, my question is whats the best way to go about this as far as rebuilding,, I have been looking a 1305r block(used for $300) ,, I have found a used b5r rod($75 with wrist pin and shims) that is suppose to be the right rod for the engine and I have not located a piston b1308R,, am I gathering right stuff in the right way,, and the crank journal on the left side has one scuff on it, it is visible but you can BARELY feel it,, I have let several mechanic buddies look at it, half say it could be a problem other half say throw a rod on it and run it, because babbits are not that precise to start with and tractor only turns 900 rpm,, this is just a crank every couple of weeks tractor,, Im just sort of overwhelmed with the hole ordeal.. any guidance or advice would be appreciatted.


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