|
Brad, Classic symptoms of thermal breakdown of the electrical insulating, tar like petroleum product, contained with in the coil. Works fine for an hour or two, then as the insulating compound starts to break down, leakage current compounds the thermal heating effect, and also starts robbing power from your sparkies. Net result is after a period of time the tractor shuts down and will not restart until the coil has cooled sufficently to electrically insulate the coil windings again(about an hour). If you would like to test your coil the next time you go to work the tractor carry along a cooler full of chilled adult beverages, ensure there is a large amount of ice in the cooler to maintain cold temps. As soon as the tractor starts to sputter and shut down, grab one of those Barley pops, open it and as you remove the coil enjoy a cool one. Now the reason I had you open that can of Hops first, is because it's really tough to open them with gloves on. Darn that coil is hot, bet you're glad you put those gloves on. Ok, now were ready to test the coil, grab another Barley pop, to make room for the coil, cause you're giong to stick that hot coil in the cooler. Since it gonna take about two quick barley pops, to cool that coil sufficiently we'll just walk around the old tractor and check her out. Ok its been about 15 minutes and I said two quick beers, but you are a little slow, so go ahead and hook that coil back up. She fires right up, sounds good. Now the other way to check it is to grab that High Performance $42 coil the BIL stuck on his 641 last month and carry it with us. Now as soon as your tractor dies, jump off there and stick the BIL coil on there, then fire her right up. I bet she'll run all day on that BIL coil. Now since fall is comming along and the BIL ain't gonna need his tractor until the week before Thanksgiving, we'll just stick your old coil back on the BIL tractor. This is the third step in testing the old coil. Since the ambient temperature is going to be a lot cooler by the time BIL fires up his tractor that coil should hold in there much longer. Heck if we have a fairly cold winter, it won't be until late spring time before that coil starts breaking down again. By then I'll have forgotten I'ld borrowed his coil, to check out this cascading current thermal runaway insulation breakdown faulty coil theory. Heck, I bet he'll even buy the beer, when he asks me over to help him troubleshoot why his tractor keeps shutting down after an hour or two of run time, and then fires right up after it cools down for about an hour. Hmmmmm seems as though I've seen this problem before, hey BIL pass me another cool one while we try to figger out why your tractor don't start..."When's the last time you put a new starter on here?"... :O )
|
