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Harry Ferguson Tractors Discussion Forum
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burnt points

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Mark from the f

04-09-2008 04:21:17




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Greetngs,
I went out after all winter and TO35 fired right up. Took the little one for a SHORT drive (supposed to be a LONG drive)/
About 10 minutes into our drive, she sputtered and backfired BIGTIME>
Couldn't get her to fire.
Pulled distributer cap-looking for moisture and the points were toasted and the rubbing block was melted.
It is a 12 v. with genny. Never had any problems before. Could something go out from setting all winter?-doubt it.
I never shut down tractor, like to leave ignition on with points closed to burn them. It was running when she POOPed out.
Could my adjustment screw on points work loose and slowly collapse points?
Changed to a set of used points with proper gap and she took right off.
I've driven this tractor for hours last year so I don't believe its a "needs a resistor" problem.
It is 12 volts with 12 volt coil and VR.
I would think if it had a 6 volt coil, she would have done this last spring when I got her.
Just curious, dont' really have the time now to tear into her, but thought I'd shoot this out to you fellas.
Mark

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gerard

04-09-2008 13:54:52




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 Re: burnt points in reply to Mark from the fort, 04-09-2008 04:21:17  
Take dist cap off and crank engine over with ignition on. Should be a small spark at points. If it"s a blue flash, condenser is shot.



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Jerry/MT

04-09-2008 09:51:30




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 Re: burnt points in reply to Mark from the fort, 04-09-2008 04:21:17  
Make sure your voltage regulator is set correctly. Excessive coil input voltage will increase point current and cause points to burn. When you replace points, start up the engine and watch the ammeter. Whn the battery is charged after the start, the current should be around 4 amps max. Then use your voltmeter and measure the voltage at the generator output or at the battery. It should be roughly between between 13-14 volts If it"s higher, you need to readjust the VR. Since the primary circuit carries about 3.5 ohms total resistance and for every 1 volt increase, the point current goes up 0.36 amps so a 3 volt increase in regulated voltage can increase the point current by over 1 amp.

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Gerald J.

04-09-2008 08:16:52




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 Re: burnt points in reply to Mark from the fort, 04-09-2008 04:21:17  
Point life is short when the condenser is bad.

Gerald J.



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