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Farmall H backfires

S

Shop teacher 94

New User
Got a question for you all. I just bought a 43 Farmall H, it ran decent until the other day when it just died...I was pushing some half sunk RR ties out of the ground. I got it started again, but it Ran real Rough...then started backfiring, compete with a bit of flame coming out of the stack. What would cause this?

I am new to the Farmall, so if you have an idea, you may need to put it in real detail, so i can understand them.

I did replace the plugs...gapped at .025. # of the 4 plugs were fouled up. looking like it ran a bit rich.

From looking through the forum, it looks like the next logical place to go is the points...but I have no idea what I am looking for or where they are located.

Thanks in advance.

Dusty
 
You say you were pushing ties out of the ground. I assume you were using a front mounted bucket. You may have stripped the timing gear since the hydraulic pump is mounted at the front of the distributor. Others here are more familiar with the issue.
 
Check the carb and make sure you don't have any loose screws.

I have an A around here with a vice grip on the main adjustment screw on the carb. I was mowing and it did just what you described. That thing is loose and adjusted itself VERY rich all by itself. When it is running you can watch the jet slowly turn itself out. Vice grip keeps it working until I am not too busy to fix it.
 
had that same problem, turned out to be champion plugs. It could also be condenser,or coil. possibly broken point set. If you have a magneto, it could be something different. Distributor is located on the right side of the engine, just below 2 and 3 sparkplugs. Magneto ignition is located in the same place. It also could be a broken distributor cap , one time had a stick wind its way up and break it.
Good luck
 
it was converted over to 12 volts, so it has the distributor. I just replaced the plugs...Champion again...condenser and point set. would that be in line with the distributor?
 
Might be a dumb question...but how do I know when I have the carb adjusted right. I did adjust a little to lean it out...but it still smokes a bit, and back fires when warm.
 
do you have an external resistor for the coil? If not it is probably the coil. Make sure that your ignition wires are not crossed. Do you have the correct point gap? Make sure that your rotor is not hitting the distributor cap. I have had this problem with some new parts. If all your ignition is ok, then try carburation . I changed my Champion plugs out for AC or AUTOLITE. Some people like the Champs, I do not.
 
Not sure what you mean by the external resistor to the coil. I need to figure out if I can post some pictures on here...That mayhelp a bit.
 
OK Guys. Here are a couple pics. If I got this right. This is the distributor. The points I need to adjust are in there somewhere. or maybe a coil???

Is that correct?
a120961.jpg

a120962.jpg
 
That is a magneto not a distributor. It has points and condenser, but they are inside and behind a set of gears. I would rather think it was a slightly different issue than having you get into that unit just now. Bumping around with a loader can dislodge both water and trash in the fuel tank. Open the drain in the bottom of the carb to see if a solid stream of fuel comes out. If not, I would clean fuel system lines and the screen at the carb inlet, and the sediment bowl. The person who discussed issues with timing gears didn't know you had a non live Liftall Belly pump system that is not associated with gear damage.
Removing the distributor cap and checking for carbon tracks, cracks, or moisture is a good idea. Let us know what you find. Jim
 
Mags never have electricity going to them, the wire goes to a Kill switch (dash switch) that grounds the mag to stop it from making spark. Do not add electricity to it, it will smoke internally and be an expensive fix. Jim
 
Ok. So it is a Magneto. I will take a look at the carb tomorrow. I have cleaned the sediment bowl that is inline on the fuel line. Looked into the gas tank found the outlet hose for the fuel. That does not look blocked. So a screen on the inlet side of the carb...before I take a shot at the magneto. Thanks....glad I found this blog.
 
According to the pictures he posted of the mag ignition, there is no "live" hydraulic pump between the mag and the timing gears.
 
Before I did anything else, the first thing I would do is get rid of the champion plugs and put in some autolites then give it a try.
 
That really looks messy.

Change things ONE AT A TIME.

Points, gapped correctly.
Condenser
CAP
Wires
Coil

Make sure you have a good blue spark at the plug.
 
OK...I have some success today. Reset the point gap to .013. put it back together...fired right off. ran for a few minute and died. waited a few minutes then it popped right off again...ran a mid idle for 15 minutes...I was waiting to see if it backfired again. Good news...no backfire....bad news...it died again.

So I guess I need to be looking at the fuel supply as well. If I remember right someone mentioned a screen on the inlet side.

So I guess that is where I start.


Thanks Guys.
 
Screen in the inlet side looks good. Took some carb cleaner to it anyway. No Fire. Can anyone tell me about the fuel mixture. I do get some smoke out the stack...blue. To rich to lean? Thinking rich.
 
Sett the main Jet adjusting screw to mid way. then set the Idle air adjusting screw to mid way. Tractor fired. Died...i tapped on the magneto...fired right up. Thinking the magneto is sticking....is that possible?
 
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