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Stationary Engines Discussion Forum

Re: Ford 172 stationary power unit

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JOB

05-01-2013 17:18:25
74.36.135.98



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I am not electrically smart when it comes to ignitions systems. I did not know it would make a difference in voltage if the points were open or closed. The numbers above is with the points open. With points closed I get 5.91 volts on the side of the resistor going to the coil. On the switch side I have 11.22 volts. On the distributor side of the coil I get .079 volts. Isn't that kind of low on the distributor side of the coil?

To shine up the points I used an already used piece of sand paper. I use the same process on the points in a wico Mag that I have not changed the points in, in over 30 years. It still runs great, but only gets used 10 to 15 hours a year.

I am leaning towards a bad coil, I don't want to buy a new one if that is not the problem. I would like to know how to test the coil. Last summer when I had this problem I was running the machine and all of a sudden it sounded like someone turned the key off. So I was thinking now that the coil got hot and failed. I should have thought of that last summer. Just a guess. I should have checked for spark out of the coil wire immediately when the engine shut down. But did not know any better.

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Bob

05-02-2013 07:43:10
64.255.159.192



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 Re: Ford 172 stationary power unit in reply to JOB, 05-01-2013 17:18:25  
You wrote "On the distributor side of the
coil I get .079 volts. Isn"t that kind of low on
the distributor side of the coil?"

NO! Not with the points closed.

Connect a spark tester (spare spark plug) to the secondary terminal (tower) on the coil and using an insulated tool, open and close the points.

You should see a small spark at the points each time they open and a good, hot spark coming out of the coil each time.

If not, the coil MAY be bad and the condenser is a possibility.

Here is a link to the John Deere FOS manual for ignition systems, as posted on the Farmall Cub site. That MAY give you some further insight into this.

http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/FOS-20%20Chapter%206-Ignition%20Circuits/index.html

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JOB

05-02-2013 17:25:30
74.36.135.98



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 Re: Ford 172 stationary power unit in reply to Bob, 05-02-2013 07:43:10  
Thanks for the help Bob, I Tried the opening the points with a screwdriver and having a grounded spark plug, and could not get a spark.

I borrowed a coil off a similar engine and put it on the 4 cylinder engine and had the same luck with the screwdriver. I then took the coil wire and held it a 1/4 inch or so from ground and spun the engine with the starter motor. Had plenty of spark. I am now up and running but one coil short.

I now understand how the ignition system works sort of. The points act as a switch, but how does the opening and closing of the switch make the coil fire? Thanks again Bob I need that chipper off and on all summer.

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Bob

05-03-2013 00:48:33
64.255.159.192



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 Re: Ford 172 stationary power unit in reply to JOB, 05-02-2013 17:25:30  
Quoting Removed, click Modern View to see

The buildup of a magnetic field in the coil when the points are closed and it's collapse was points open, causing a spark from the secondary winding is explained in the first 3 pages of the previously linked manual FAR better than I could!.



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JOB

05-03-2013 01:21:13
74.36.135.98



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 Re: Ford 172 stationary power unit in reply to Bob, 05-03-2013 00:48:33  
I looked at that link. If I would have done that when you first posted it I would not have had to ask so many questions and take up your time. When it mentioned John Deere I thought it pertained to John Deere. I should have known all ignition systems work basically the same way. Thanks Bob



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