B Question

[Wrench_one]

Hi guys, Seasons Greetings. I have a B question for the deere guys out here. A friend has a B that he
had me look at and it seem to be backfiring into
the crankcase. My question is is this common? I suspect the rings and cylinder are not so great.
Also can the stock jug be bored out? or would we be better off to buy a power block. Its just a firewood tractor, light use around the farm. Thanks. Ryan K

 

[Anonymous-0]

Carb adjustment, sticky valves, burnt valves just a few problems he might have.Check the compression. The cylinders can be bored. Many different sizes available. A power Block would be very expensive and overkill for a firewood tractor.

 

[jd b puller]

What year B is it?

A PB would be overkill for a firewood tractor unless already had one laying around ready to put in.

 

[johndeereman]

check the carb adjustments if they are ok then look at the ignition plugs mag cap rotor possibly wires but doubtfull could also be out of time

 

[Mike M]

I once bought a Late B that was told in the past it had a history of doing that and blowing out the valve cover gasket too. Nobody could figure it out. I bought it knowing it may have a problem,but it seemed to run good ? I got it home and was giving it the(once over)check up and when looking into # 1 spark plug hole to verify TDC I noticed that the cut outs in the piston top didn't match up to the hole. Someone had the piston rotated around upside down. So I pulled the crankcase cover off and rotated the piston/rods assy. around to the proper spot for the piston notches to align with the spark plug hole. I ended up selling the tractor and heard no more about it other then shortly after the head gasket was seeping. I checked the nuts were all loose so got by with a retorque.
So was the piston position the problem ? I don't know for sure,but they are designed to go in a certain way for a reason. Very easy to verify so it just might be worth a look at yours.