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Farmall & IHC Tractors Discussion Forum
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Way to check a coil?

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BB

02-28-2004 18:06:03




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I have a farmall H and would like to know if there is a easy way to check the coil to see if it is any good. The tractor runs very rough even after I replaced the points and condenser. Runs eratically. It was doing it more after it got warm but now it seems to do it all the time. Thanks in advance for the help!


BB




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Wayne Swenson

02-28-2004 20:04:15




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 Re: Way to check a coil? in reply to BB, 02-28-2004 18:06:03  
Is your intake manifold leaking air??
Start the tractor and when it is acting up, take a can of your favorite "loosen-all" and spray around the manifold. If the engine sound changes it is an indication of a bad gasket or damaged manifold.
Coils can be checked with an ohmmeter or commercial tester.
Why not use an in-line spark tester and observe the spark when the engine is running??
First make sure your plug wires are the original, metal core type; the carbon core ones don't work very well on tractors. Second, find a piece of clear plastic tubing (about 1/4" I.D. and 2" long), then cut a piece of plug wire long enough to go between the coil and the center tower of the distributor cap and cut it in half. Slide the ends of the cut wire into the tubing until they meet in the center. Replace the coil to distributor wire with your new "diagnostic tool" and start the engine. Gradually increase the wire end gap to determine the spark quality. You should be able to easily see if the spark is bright blue and steady indicating all is well. A good system will probably jump a 1/4" or better gap.
This really looks "cool" in a dark shed or at night!!
This will work on either a magneto or battery operated distributor if the coil wire is accessible. You can also try one spark plug wire at a time as a cylinder diagnostic tool.
Try it and amaze your friends with your "electrical diagnostic tool" all for about $1.00 or less.

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Mark

02-29-2004 05:55:17




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 Re: Re: Way to check a coil? in reply to Wayne Swenson, 02-28-2004 20:04:15  
Slick Idea. I was just going to suggest pulling a plug wire (at the dist....don't get shocked) and varying the distance between the cap and wire end and looking for what you said that way.

Mark



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Just Hang On a Minute

02-28-2004 18:48:11




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 Re: Way to check a coil? in reply to BB, 02-28-2004 18:06:03  
Then you will know.



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John *.?-!.* cub owner

02-28-2004 18:33:17




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 Re: Way to check a coil? in reply to BB, 02-28-2004 18:06:03  
Assuming it is still on 6 volts, you cany buy a replacemnt coil from most auto parts stores for about $12. That's about the easiest way to trouble shoot a coil that is supect of not firing properly. Couple of other things to check would be if the spark advance is worn, allowing the distributor shaft to move sideways causing the point gap not to be consistent. Also another possibility would be leaks at the carb mounting or intake manifold.

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