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Allis Chalmers Discussion Forum
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C point gap

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shawnspeed3

07-10-2006 09:04:40




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Adjusted the gap on the points to .020 and tractor does not want to start. they were at .030 which seemed a little extreme...am planning to buy a manual, but have not mabe that purchase yet....and it is driving me nuts..any help would be appreciated ....Shawn




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BCnT

07-10-2006 13:28:39




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 could be power screw on carb too... in reply to shawnspeed3, 07-10-2006 09:04:40  
i get a minor miss occasionally too and a small tweak on the power adjuster screw on carb usually makes it go away for awhile until another unknown gets stuck in orifice...after 40+ years even a clean gas tank will shed some particles small enuff to pass thru a filter.
OR you could do like old and i were discussing below...if its a bad wire or cap just run yer hand over them while its running...doesnt take long to pinpoint the problem ;)

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Craig in MO

07-10-2006 10:37:05




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 Re: C point gap in reply to shawnspeed3, 07-10-2006 09:04:40  
Good link that explains mechanical ignition systems. The condenser is explained under the "The Distributor" section about half way down the article



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Craig in MO

07-10-2006 10:21:45




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 Re: C point gap in reply to shawnspeed3, 07-10-2006 09:04:40  
I would suspect the condenser. It is there to help stop the points from sparking. The points have to open fully with little or no sparking so that the voltage built up in the coil HAS TO discharge across the gap in the spark plug. If the points circut does not open properly then you get funky spark. The wider gap will mask this problem. Try the condenser. Good Luck

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shawnspeed3

07-10-2006 09:49:51




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 Re: C point gap in reply to shawnspeed3, 07-10-2006 09:04:40  
Thanks Old, the bushings didn't feel loose. but ya don't know till ya mic it...Just trying to get rid of a little random studder the tractor has ...runs good ,no smoke ,pulls hard with load applied,and then will start a miss here and there..once everything is rolling.checked the fuel system, and everything looks good.. checking the grounds when I get home this eveining. Shawn



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old

07-10-2006 10:04:28




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 Re: C point gap in reply to shawnspeed3, 07-10-2006 09:49:51  
You could also have a few other things wrong. Your coil might be going bad, maybe the condensor, or even something in the carb. I have a C that I call major pain because it always seems to want me to work on it. Every time I turn around I have to fix something or do a little TLC to it but I guess thats part of have old tractors and I have way way to many LOL.

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old

07-10-2006 09:33:37




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 Re: C point gap in reply to shawnspeed3, 07-10-2006 09:04:40  
The manual does say to set them at .020 but you also may have worn bushings in the distubutor which would cause you problems and if they are worn you may need to rebuild it. Something else you might try is setting them at say .025 and see what happens, could be who ever had that tractor set them wide because of slop in the bushings and just used that as a way to get by

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