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Tractor Talk Discussion Forum

1945 B John Deere Runs Poorly

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JD Howard

10-20-2004 15:55:24




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My question is what would be causing the B to run on the flywheel side and only run part of the time on the pulley side. It seems to foul the spark plug and smoke when the petcock is open on the pulley side. Would the cause be the mag or the carb. It has a rebuilt motor, new carburetor, and a rebuilt magneto.




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Allan in NE

10-20-2004 17:17:19




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 Re: 1945 B John Deere Runs Poorly in reply to JD Howard, 10-20-2004 15:55:24  
Howard,

I agree with Bushhog Papa. She's supposed to run lopesided at idle.

Heck! That's probably the nicest part about those ol' Johns.

Allan



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BushogPapa

10-20-2004 16:39:07




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 Re: 1945 B John Deere Runs Poorly in reply to JD Howard, 10-20-2004 15:55:24  
I suppose you are generally new to 2-Cylinder JD's..??? On the older single carbureted JD's, the "Lead cylinder" is the left ( flywheel side), and the trailing is the Rt side.. The Left Cylinder draws nearly all the available air/fuel mixture, and leaves nearly none for the Rt cylinder while it is idleing... With the petcocks open, mine seldom fires on the rt cylinder at Idle..Very Normal.... If your mag is a little weak, it may promote plug fouling on the rt cylinder, too..

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Sloroll

10-20-2004 19:14:37




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 Re: 1945 B John Deere Runs Poorly in reply to BushogPapa, 10-20-2004 16:39:07  
I'm missing something. I am not dissagreeing but I am confused. wouldn't the same fuel air volume by stroke be drawn through the carb? I could understand if the mixture had farther to travel to one cylinder rather than the other as the vortex may grow weaker for the distant cylinder allowing the fuel to somewhat "un" vaporize. With your reasoning a farmall would hit hard on number one cylinder then fire less on 3,4,2. The intake stroke for the leading cylinder would be somewhat less strong as the engine has coasted for two strokes and slowed somewhat. Does the carb load up on the coasting two strokes? The second intake stroke in my mind should be more vigorous because of the increased speed and draw during the lead power stroke. I am a self taught tinkerer so I am always learning. I wish I would have listened to Grampa more. I'm tired so don't want to think about it in bed. I'm just happy my little farmall purrs along. I retard the spark a bit on it to for parades. I guess all my parading has been on retarded tractors.

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Allan in NE

10-20-2004 20:16:14




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 Re: 1945 B John Deere Runs Poorly in reply to Sloroll, 10-20-2004 19:14:37  
Hi Bill,

"Retarded tractors"..... LOL!!!! Good one!

I don't know too. :>)

But, it has to do with that single barrel carb on the older Johns, like you say, "favoring" the flywheel side cylinder at idle because it has a tendency to pull more of a fuel charge for a longer duration of the crankshaft's rotation. Ugh! That sounds dumb! :>(

Anyway, when they dropped on the 2 barrel carb, the problem was cured. Darn! Hope somebody comes in here and helps me with my weak-kneed try at explaining this..... ...

What I'm tryin’ to say is that the single throated carb made the off-side cylinder act like a "hit-n-miss" engine part of the time, hence the Johnny-Pop sound.

(I really don't know whether to hit the send button on this one or not)....:>(

Allan

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Rod F.

10-21-2004 04:17:58




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 Re: 1945 B John Deere Runs Poorly in reply to Allan in NE, 10-20-2004 20:16:14  
Hi Allan,
Yeah, I liked the retarded tractors bit too....
I'm not sure that I can fully explain the problem with the Deere, but it does make some sense to me. Think for a minute about intakes, carbs, heads and porting, especially in a race engine. Most of these intake systems have a point at which they are optomized to flow, right? They determine largely how well the engine breathes and where it makes power. Get enough lift to the cam, and the darn thing will shake the fenders just trying to idle. My guess is that the old Deere's intake system flows better at full power than at idle. Wouldn't be much good to work better at idle and not at full power. Then mabey they wouldn't have been so popular. Now, mabey I'm wrong, but at least I threw some gas on the fire. Have a good 'un.

Rod

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Sloroll

10-20-2004 16:14:24




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 Re: 1945 B John Deere Runs Poorly in reply to JD Howard, 10-20-2004 15:55:24  
My Old 36 B would run the same way. Many times the spark proved itself to me. What I did was retard the spark just a bit. It ran real smooth then. It was great for parades and dinking about. When I went to plowing meets or ran the belt I advanced it a bit. It ran very even under pull so all was fine. I think playing with the valves a bit may help too. If the cylinders are drawing air unevenly they will be getting a different Air/fuel mix. The carb may be favoring one side over the other. These of course are shade tree remedies. Nothing to technical for me.

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Harley

10-20-2004 19:46:17




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 Re: 1945 B John Deere Runs Poorly in reply to Sloroll, 10-20-2004 16:14:24  
I've had the same trouble on the few JDs I've messed with. They sound like they are only running on half a motor. I think if I could find those other two cylinders, get them to firing, that JD might just have a tractor there. Harley



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1945 A

10-22-2004 09:49:08




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 Re: 1945 B John Deere Runs Poorly in reply to Harley, 10-20-2004 19:46:17  
They were made that way...
By design, the left cylinder fires, then 180 degrees later, the right fires, not enough time to allow availibility for a "full charge" of air/fuel mixture for the right side. At full throttle, there"s more mix availible, through air velocity, and the secondary or "load" needle setting on the carb.
I kind of like the sound--- (okay, I admit I"ve got one :)), and the 382? cubic in. is enough power to do what I need. Mine"s an "A" with a "power block"...

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