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MF135 Electrical problem

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Keith W.

04-29-2001 15:47:57




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My MF135 was running OK until today. It would shut down after running for a while. After letting it sit for a short while it would start and run again for a while then quit. After some quick troubleshooting, I saw that I wasn't getting spark to the plugs, and that when I cranked the engine there was a stream of spark arching from the main coil wire boot at the coil and the small wire (at the terminal) going from the coil terminal to up under the distributor. I pulled the wire out and worked with it and plugged it back in, and it started briefly but sputtered a lot and I could still see the spark arching. I shut it off, worked on it some more, and then when I turned the key, even though there was juice and the lights dimmed when I tried to engage the starter, nothing happened, not even a sound. After a couple of tries it activated the starter and cranked the engine with the same results with the spark. One more time I tried and this time I couldn't get the starter to activate no matter what I tried. I had plenty of juice left in the battery. I noticed also that the coil was very hot, not sure if this is normal. Any suggestions would be very much appreciated, as I'm not a mechanic, just a putterer.

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Keith W.

04-29-2001 17:13:34




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 Re: MF135 Electrical problem in reply to Keith W., 04-29-2001 15:47:57  
Update: After towing the tractor out of the field to where I could work on it better, the problem getting the starter to work fixed itself, now sure how. While cranking the engine, I had a friend look closer at the spark arching on the coil, and he noticed that it was coming out of a small hole in the coil below the boot for the main coil wire and above the terminal for the small wire going to the distributor. I'm assuming the coil got overheated and broke down, and that replacing the coil is the obvious fix. Is this a rare event for the coil to actually burn a hole through it's side or fairly common ? I've never seen it happen before.

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Keith W.

05-05-2001 15:01:41




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 Re: Re: MF135 Electrical problem in reply to Keith W., 04-29-2001 17:13:34  
Another surprise. What looked like a hole was actually just a very fine scorch mark from the arching. I took a clean rag and rubbed it hard and it all came off. Put in new plugs and new wires and it ran like a champ. Even didn't have to choke the heck out of it for 10 minutes like normal to keep it running right. The old plugs were in rough shape, and all were actually loose, didn't have to break them free at all. Acts like a whole new tractor, and runs a lot smoother ! Thanks for all the help from the board and e-mails.

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Jim/Mississippi

05-01-2001 19:57:32




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 Re: Re: MF135 Electrical problem in reply to Keith W., 04-29-2001 17:13:34  
Keith, I'd like to suggest that a fresh set of solid core spark plug wires might be
due for the hard worker. If they are
of high resistance, that could have
been a possible reason for the hole
to have formed in the top of the coil.

Congradulations on diagnosing the problem!



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Tyler(WA)

04-30-2001 10:26:49




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 Re: Re: MF135 Electrical problem in reply to Keith W., 04-29-2001 17:13:34  
It happens but not often. Open spark jumping is a sign of high resistance somewhere downstream from where the sparking is happening. The job of that coil is to provide a high energy potential that is conducted through the center wire to the cap, through the rotor to the plug wire, through the plug wire to the plug and then it's to jump between the anode and cathode of the plug, creating a spark. A bad plug or plug wire, or a bad cap or center wire can all cause what you wittnessed. Of course, insulation breakdown at the coil can certainly do it too. You found that.

Good job Sherlock, you're not a half bad mechanic.

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