axial_al Posted January 31, 2005 Share Posted January 31, 2005 My F14 cranks right up when cold (almost any temp), but If I want to restart within an hour or two, forget it. I have replaced wires and plugs, points and condensor. Anyone know if the coil could be at fault? Any F4 experts out there know of anything else it could be? The motor was overhauled recently and is in good condition. Thanks for any help. Link to comment Share on other sites More sharing options...
Old-F20 Posted January 31, 2005 Share Posted January 31, 2005 i dont think its your mag Link to comment Share on other sites More sharing options...
Farmall Power Posted January 31, 2005 Share Posted January 31, 2005 The coil could be bad but I would take the points out and clean them up, they can get a film on them really eazy. It could be a bad coil too but it also could be something else, carb not adjusted right or not enough gas, does it have spark when you try to start it latter ?F P Link to comment Share on other sites More sharing options...
axial_al Posted January 31, 2005 Author Share Posted January 31, 2005 The coil could be bad but I would take the points out and clean them up, they can get a film on them really eazy. It could be a bad coil too but it also could be something else, carb not adjusted right or not enough gas, does it have spark when you try to start it latter ?FP <{POST_SNAPBACK}> It seems to me the spark is weaker when the tractor is all warmed up. First thing I thought of was the condensor as they can do funny things when warm. Hate to tear into the coil, but am at wits end. I use it to run the auger to load out sometimes and it is frustrating to have to pull it to start! Thanks for the advice. Link to comment Share on other sites More sharing options...
nosih Posted January 31, 2005 Share Posted January 31, 2005 Try replacing the coil. It sounds like the insulation in the coil is breaking down. if you continue to run the tractor like this, the tractor will probably run until enough heat builds up in the coil to cause the coil to short. Link to comment Share on other sites More sharing options...
w6_gas Posted February 1, 2005 Share Posted February 1, 2005 It is more than likly to be the coil. Take the cap of and take an ohm meter from the coil output (center piont) and put the other lead to the mag case and you should have about 7000-9000 ohms. If any less your coil is weak. Link to comment Share on other sites More sharing options...
kfox Posted February 1, 2005 Share Posted February 1, 2005 The next time you have it warmed up good and it won't start, take the fuel line loose at the fuel pump and crank it over to see if your getting a good supply of fuel. I went through this problem years ago, and it about drove me nuts ken Link to comment Share on other sites More sharing options...
superdaughter Posted February 1, 2005 Share Posted February 1, 2005 The magnet could even be loosing some of its magnetism and need to be regenerized, those old magnets are supposed to get better with age (one of the few things in life that do) but they can still become weak. As others have said the coil is a possibility too. Link to comment Share on other sites More sharing options...
chip man Posted February 1, 2005 Share Posted February 1, 2005 The old 'A' my dad had started to quit running when hot, or if he shut it off when it was good and warm, it would not start. It frustrated him to no end, as he had changed everything in the ignition system except the coil in the mag. After a few months he was planning on putting on a fuel pump, thinking that would help,I finally convinced him to buy a coil. I installed it, and that tractor has been very reliable the last six years. Link to comment Share on other sites More sharing options...
cliff Posted February 1, 2005 Share Posted February 1, 2005 I have several of these tractors in my collection and I also repair magnetos in my spare time when I'm not roaming around the country(literally). When I rebuild a magneto for someone I always replace the coil if it is the old asphalt covered style. The new style coils are plastic covered and they won't short out when hot as the old style does. The car manufacturers found this to be a problem as well, so they filled the coil with oil as a cooling agent somewhat like a transformer mounted outside your barn on the pole. If you notice on the newer cars, the OEM's have since returned to the E-CORE style coil, which is the SAME design as the ones in our F-4 and F-6 and the H-4 magnetos. I get mine from Brillman in Virginia. He's a very nice fella and good to deal with, even after I closed my garage. Link to comment Share on other sites More sharing options...
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