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1928 Farmall tractor first time out in 5 years
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Frequently Asked Questions...
farmall tractor producing no spark?
I have a farmall tractor that was converted to 12v years ago but when my dad and I tried to start it, it would not start. Now we concluded that there was compression and fuel but no spark. Now we took apart the distributor to find out that the cam was not hitting to make that short, so there was a problem, then we did a small tune up replacing the spark plugs, the internals to the distributor, and the distributor cap. When we put it all back together we checked to see if there was a spark and still no spark, so we hooked up an ohm meter to the coil wire and another to ground. When you turn the key it is 12.7 volts but as soon as the engine turns it is only 9 volts. This sounds like the issue but I don't want to change out the coil and spend that money to find out that that is normal. Any help would be greatly appreciated!
Answer:
This sounds like you have a coil issue and have to replace it. Being that you converted it to a 12 volt system is the deal breaker. The coil on most cars usually last a very long time but in your case the coil is suspect and must be updated to meet your battery. You also stated that your battery reading was 12.7 It should be 12V stone cold sitting. I'd also suspect the voltage regulator after you replace the coil. If your reading was after the engine was running then, that's okay. it's when you get past 13.8-14V with the engine running there's a problem ie: alternator /regulator I'm not sure what year your vehicle is but if its old the coil has oil in it to cool it. Check for any signs of leaking or openings that shouldn't exist. Newer cars don't use oil to cool them.
After you replace your coil you might want to check the wires too for cracks and spark.Check the lead wire comming out of the coil to a ground spot on the engine and see if you get spark.
If there is no spark after changing the coil your wires are at fault too. An ohm meter is useless and you can't go by it being that you updated. Your coil needs to put out an even greater spark now.
All of this is common when changing over an electrical system. Change the coil. Then check the wires out real carefully.
























































































