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860 starting problem solved?? long post

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ken in wisconsi

11-08-2004 06:45:43




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Acting on advice from the board, I replaced all battery cables with hairy 2/0 cables and had the starter overhauled because of slow turnover. I purchased tuneup parts from the supplier on the left side of the board. New battery, plugs, plug wires, points, condenser, distributor cap and roter. The engine turned over nicely, started, and ran for a short time (badly), and wouldn't re-start. I pulled the distributor cap and noticed brass shavings laying atop the dust cover, but couldn't see any marks on the contacts of the distributor cap where the rotor may have "scraped" the contacts. Replaced the cap and tried to start again. Nothing. I pulled the distributor cap again and found that the rotor had broken in half, obviously from hitting the contacts in the cap. I put the old distributor cap and rotor on and checked the spark which seemed yellow and weak. Tried the starter and the tractor started right up. Went to work pulling a tree from the woods and the tractor simply stopped running after about 15 minutes. It started up again, but would only keep running (badly) if I played with the choke. This began to sound like a bad coil so I went to town and got a new one. The coil was stamped, "12V must use primary resister wire or resistor in system". The mechanic at the shop said this meant that if the coil was used in a 12V system that a resistor was needed, otherwise, not. Since I have a 6V system, I installed the coil, treated the carburator to a carb cleaner bath and tried the starter again. Fired up and ran immediately. I ran the tractor for about 45 minutes, doing light work and it ran well and was able to idle at the slowest possible throttle setting, which it hadn't done before. So I have three questions, and solicit opinions. 1. Should I contact the supplier of the cap and rotor. They obviously were not matched, unless there is some other reason why the rotor broke.
2. Was my starting problem really the coil all along? 3. Will the new coil fail if I do not have a resistor in the system. Thanks for any opinions.

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gusc

11-09-2004 22:05:41




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 Re: 860 starting problem solved?? long post in reply to ken in wisconsin, 11-08-2004 06:45:43  
3. As txblu says you don't need an external or internal resistor with a 6v system. All coils are 6v but if they are used with 12v systems they are marked "12v" and must use an external or internal resistor to keep the coil voltage around 6v except when starting or when at high rpm, they then get the full 12v or close to it.



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Matt Smith

11-08-2004 15:27:57




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 Re: 860 starting problem solved?? long post in reply to ken in wisconsin, 11-08-2004 06:45:43  
Did you reuse the metal clip from the old rotor button? That may be why you had metal shavings. The new rotor didn't seat squarely on the shaft.



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ken in wisconsin

11-09-2004 13:37:18




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 Re: 860 starting problem solved?? long post in reply to Matt Smith, 11-08-2004 15:27:57  
I don't know what you mean by rotor button, or metal clip. Neither the old rotor nor the new one had a metal clip. I'm preety sure the rotor was scraping on the dist. cap contacts. I e-mailed the supplier on the left of this board to refund me the price of the dist. cap and rotor but havn't heard from them yet. I'll let the board know if they do/don't respond within a week.



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paul

11-09-2004 16:08:58




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 Re: 860 starting problem solved?? long post in reply to ken in wisconsin, 11-09-2004 13:37:18  
There is a little metal spring clip that Ford used between the dist shaft & the rotor. You need that in there, or the rotor flops around.

--->Paul



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ken in wisconsin

11-10-2004 08:30:12




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 Re: 860 starting problem solved?? long post in reply to paul, 11-09-2004 16:08:58  
Thanks, Paul. I guess I'll have to track down one of those spring clips. I did notice that there was a lot of play in the rotor, but didn't know why. Now that I know a clip is needed, I'm a little surprised that the tractor runs as well as it does.



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Bob

11-08-2004 07:00:52




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 Re: 860 starting problem solved?? long post in reply to ken in wisconsin, 11-08-2004 06:45:43  
I'm not sure about the 860, but some of the Cases had variations in the distributor, and some models could use more than one cap. Of course, there could have been a problem with the new parts, or possibly the cap did not sit down straight, and that caused the damage.

A bad coil can sure cause lots of grief!

The 12 Volt external resistor coil should be just fine on 6 Volts. If the coil is close, but not close enough for your 6 Volt use, I would expect shortened breaker point life, rather than coil failure.

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txblu

11-08-2004 07:08:11




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 Re: 860 starting problem solved?? long post in reply to Bob, 11-08-2004 07:00:52  
The I2R losses could overheat the coil which could kill it. (Notice the rubber word could). Course who knows. Lot of variables.

Mark



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txblu

11-08-2004 06:55:08




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 Re: 860 starting problem solved?? long post in reply to ken in wisconsin, 11-08-2004 06:45:43  
1 yes
2 Could have been or fuel clog which you corrected.
3 No, not on 6 volts.

Mark



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