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John Deere Tractors Discussion Forum
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1947 D Carb adjustments and ideas for backfire

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schultz

04-10-2014 05:16:13
198.208.159.20



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I'm not familiar with the JD line but a friend inherited a 47D and when it warms up it randomly backfires out the right stack. The stack is not hot to the touch like the left side so I'm thinking it's not firing, but why? Fuel/Spark? I figured I'd start with plugs/wires and then start going from there. Does anyone have any suggestions on this? I figure the last thing on the list was valve lash. Is this easy to do / get to on these?

Thanks for all the help
Brent

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JRSutton

04-10-2014 18:32:56
71.174.108.245



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 Re: 1947 D Carb adjustments and ideas for backfire in reply to schultz, 04-10-2014 05:16:13  
A carb out of adjustment can do it. Checking it is very quick and simple.

I'm pretty sure the carb on the D has two needle adjustments you can do by hand - a load needle and an idle needle. (should be marked on the carb - look closely).

Open the idle needle up a few clicks and see if it makes a difference. If not, go a little more. If you're blowing black smoke, you've gone too far And if it's still backfiring, put it back where it was and look elsewhere.

(if you get lost on where you're at with it, just crank it all the way in, then back out 1 1/2 turns and it should be good).

If you're still backfiring - I'd look at the plugs, and while they're out do a compression check on each cylinder.

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Mike M

04-10-2014 12:26:32
24.140.0.120



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 Re: 1947 D Carb adjustments and ideas for backfire in reply to schultz, 04-10-2014 05:16:13  
A 2 cyl Deere with a single induction carb. will not always fire on both cylinders unless it is under a load. The right hand cyl. is the weak side. Having a dual stack set up on a D could possibly make them backfire at times worse then normal ? I never had one with that set up.



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Earl-IL

04-10-2014 11:37:48
50.81.209.158



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 Re: 1947 D Carb adjustments and ideas for backfire in reply to schultz, 04-10-2014 05:16:13  
What mag is on this tractor ?



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schultz

04-10-2014 12:36:06
198.208.159.20



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 Re: 1947 D Carb adjustments and ideas for backfire in reply to Earl-IL, 04-10-2014 11:37:48  
That I do not know, I'll have to take a look and get a picture.



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Gtx1967jewison

04-10-2014 10:45:25
70.198.1.218



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 Re: 1947 D Carb adjustments and ideas for backfire in reply to schultz, 04-10-2014 05:16:13  
If not an ignition issue, then it's just lean.



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John Deere D

04-10-2014 07:24:05
199.66.168.59



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 Re: 1947 D Carb adjustments and ideas for backfire in reply to schultz, 04-10-2014 05:16:13  
Start by swapping the spark plugs and verify if the problem changes to the other cylinder. Remove the distributor cap and make sure contacts inside cap are clean and shinny. Make sure rotor is firm on mag armature (not loose)and all metal parts of rotor are shinny. Make sure there is no moisture inside Mag Cap. If you have access to a multi meter check each spark plug wire for resistance (ohms). Spark plug wires should have a metal conducting core NOT CARBON if your D has a Magneto. Make sure the seat (point where the spark plug bottoms out on the head) are clean and shinny. When you purchase new Spark Plugs be sure to purchase plugs with NO resistor. Check to see that the two outlets on the Mag Cap where the spark plug wire plugs into are clean and shinny. Usually the top spark plug wire on the Mag runs to the left cylinder Spark plug, and the bottom spark plug wire runs to the right cylinder spark plug. Right and left are viewed as if you are on the tractor operating it from the drivers seat.

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