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Tractor Talk Discussion Forum

points

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smdv806

02-24-2007 09:15:59




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I clean the points up and my tractor runs good, but shortly it begins to miss again after a few hours and the points turn white. Why does it keep doing this?




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TomTX

02-24-2007 16:13:23




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 Re: points in reply to smdv806, 02-24-2007 09:15:59  
Put on new points, condensor, rotar, dist cap, wires, plugs. Problem will likely be over.



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dan hill

02-27-2007 01:35:50




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 Re: points in reply to TomTX, 02-24-2007 16:13:23  
Avoid parts changing,condenser is suspect ,even if new.



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JMS/MN

02-24-2007 10:38:51




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 Re: points in reply to smdv806, 02-24-2007 09:15:59  
I 'heard' years ago that points had a special coating on them, and taking a nail file to them would take off that coating, so it was only a temporary, one-time fix. Would then burn up faster.



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Walt Davies

02-24-2007 09:48:05




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 Re: points in reply to smdv806, 02-24-2007 09:15:59  
sounds like you are running a 12 volt system without a Balance resistor if so your auto parts store has them doesn't matter what they came off of as they are all the same.

Walt



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Jon Hagen

02-24-2007 10:56:43




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 Re: points in reply to Walt Davies, 02-24-2007 09:48:05  
One comment on Walt's post, ballast resistors are NOT all the same. depending on the application, they vary from .5 ohm to as high as 1.9 ohm. for a 12 volt system, you want about 2.75--3 ohm combined resistance(resistor/coil) in the primary circuit. This can be a true 12 volt coil with a 3 ohm primary winding, or a combined ballast resistor of about 1.5 ohm resistance connected in series with a coil with a 1.5 ohm primary winding. The true 12v coil with a 3 ohm primary winding eliminates the need for a ballast resistor, but leaves you with no option to bypass the resistor during cranking/starting for a temporarily hotter spark to ease starting. Most car/truck point ignition systems used the ballast resistor and 1.5 ohm coil system because of the advantage of stronger spark for starting in cold/damp comditions. Another reason to use the ballast resistor in a 6 to 12V conversion is that it allows you to reuse your perfectly good 6V coil which has the 1.5 ohm primary winding.

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Aaron Ford

02-24-2007 09:29:44




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 Re: points in reply to smdv806, 02-24-2007 09:15:59  
Breaker style points will quickly become pitted if the condenser is malfunctioning. The condenser acts as a shock absorber preventing arcing when the points open. Also contaminants left from filing or sanding can also cause hotspots and pitting. Using the wrong ohm coil may have an effect. Hopefully someone else can chime in and explain this further.

Not sure of your application but breakerless electronic ignition kits are available to retrofit most points style distributors. Costs around 80 bucks. Never have to fool with it again.

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old

02-24-2007 09:25:54




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 Re: points in reply to smdv806, 02-24-2007 09:15:59  
I'd sy replace both the points and condenser. Your condenser is most likely bad and causeing your problems



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Ken Thies

02-24-2007 09:19:29




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 Re: points in reply to smdv806, 02-24-2007 09:15:59  
You probably need to reverse the wires on your coil.
Ken



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KEH

02-24-2007 12:03:20




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 Re: points in reply to Ken Thies, 02-24-2007 09:19:29  

I had a JD 2010 once that kept burning out the points and running bad. Turned out the switch was bad. New switch, problem went away.

KEH



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