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Starting troubles

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Kristof

01-04-2008 10:50:24




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I've sorted out my waterproblem (as I posted in a previous message). The copperpaint did the trick alright :).
But now, after my rebuild I've completely assembled the engine, only one problem, I've been trying all day to get it to run, but she's letting me down...
I think I'm not getting any response from my H4 magneto. I noticed that the conductor that runs over to the ignition keeps using up power (It constantly draws about 22Amps, even when I'm not trying to run the engine)
About the fuel, for what I know I do think the fuel is getting thrue, it only needs a little adjustment...

Does anyone has any pointers?

Kind Regards,

Kristof

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Janicholson

01-04-2008 15:06:44




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 Re: You are welcome in reply to Kristof, 01-04-2008 10:50:24  
I am glad to be of assistance.
The spark should click at TDC #1 cylinder. JimN



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CENTAUR

01-04-2008 11:16:43




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 Re: Starting troubles in reply to Kristof, 01-04-2008 10:50:24  
DISSCONECT the (conductor) as it is a ground to shut down the MAGNETO if it is used as your ignition. IF the MAG is used as a distributor then it will be different. CENTAUR



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Janicholson

01-04-2008 11:12:59




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 Re: Starting troubles in reply to Kristof, 01-04-2008 10:50:24  
disconnect that wire now. jimN



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Janicholson

01-04-2008 11:12:53




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 Re: Starting troubles in reply to Kristof, 01-04-2008 10:50:24  
disconnect that wire now. jimN



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Janicholson

01-04-2008 11:21:17




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 Re: Starting troubles in reply to Janicholson, 01-04-2008 11:12:53  
Sorry for the short answer. The long answer is that a magneto should never be connected to power. The terminal on the Mag is used to ground out the primary windings inside the mag so the tractor can be stopped. The mag may be toast. 22 amps is about the amount it would draw through the system as it was being fried. Sorry about the blunt truth, but it is that way. The switch on the electrical box (for a mag) is a ground only device. It is grounded when pushed in, and open when out. If the points and primary are not burned up it will run with nothing connected to the Mag at all. Please keep us informed, some of the responders may have parts to repair it if it is toast, or Magman can for sure fix it. JimN

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karl f

01-04-2008 16:51:51




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 Re: Starting troubles in reply to Janicholson, 01-04-2008 11:21:17  
when selling universal ignition switches i always lose customers at work when i ask if their ignition is mag or battery--maybe they think someone under 40 (27 and look 18) doesn't know his stuff. "it's just a *&(^(%^*%^&*%^ lawnmower/farm tractor" and walk out.
also have had them try to warranty a briggs mag when the switch they had was the culprit, or any combo of switch/mag.

the problem is no one knows mags even exist. I don't believe magnetos are even covered in most tech college programs anymore.

my motto after interesting customer encounters is "just because you can turn the wrench doesn't mean you should use it"

nothing wrong with not knowing and learning from it, but it's the not knowing and refusing to learn...


karl f

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Kristof

01-04-2008 11:28:10




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 Re: Starting troubles in reply to Janicholson, 01-04-2008 11:21:17  
Hey,

Eurm, I think it's still intact as I measured out the entire thing. But I don't know how to wire up my tractor, as it's previous owner kinda blew it on the electrical bit... Can U tell me how to do it? Where should I connect the ignition to then? Kind regards,

Kristof



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Janicholson

01-04-2008 12:06:56




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 Re: Starting troubles in reply to Kristof, 01-04-2008 11:28:10  
Sure!
The Ignition System is self contained. there is no connection to the battery or starter, or any other electrical system. The Mag generates its own Voltage, then converts it to spark volts.
The electrical box on the steering post has a mushroom shaped button that is a grounding switch. The switch body is grounded to the box, and a single wire runs from it to the mag side terminal. When the awitch is our, it is open. allowing the mag to produce primary voltage. (tractor runs) When it is in the wire is grounded. this prevents the mag from generating spark.
The wiring diagrams can be found in the archives (use the search for box above, and type in Mob M Diagrams. Good luck, The 22 amps even for a few seconds might have toasted the mag. The points at least. THe manual is necessary for mag servicing, it needs to be kept in time internally. JimN

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Kristof

01-04-2008 12:22:57




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 Re: Starting troubles in reply to Janicholson, 01-04-2008 12:06:56  
FORTUNATLY
we're dealing with original farmall equipment here B).
After an entire day of those good old 22Amps the mag is still intact!!
Couldn't be more happy, thanks a whole lot janicholson, appreciate the help!
I've got my sparks, now it's just a matter of working the carburator and I bet I'll get it running tomorrow.

Kind regards



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Andy Martin

01-04-2008 13:08:54




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 Re: Starting troubles in reply to Kristof, 01-04-2008 12:22:57  
Glad your magneto is still alive.

You don't have to have the wire connected to use the magneto. Without the wire attached, you just have no way to kill the spark. You can still kill the engine by idling down and trying to take off in 4th gear, or with the brakes set, or last resort, pull the choke (and wash the cylinder walls with gas).



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KRUSS1

01-04-2008 15:10:56




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 other, better ways to kill the engine in reply to Andy Martin, 01-04-2008 13:08:54  
Two other ways to kill the engine are:
Shut off the gas flow (a good idea anyway)
Use a screw driver with an insulaied handle and simply short it from the screw on the mag to any other metal.



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Andy Martin

01-04-2008 19:33:29




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 Re: other, better ways to kill the engine in reply to KRUSS1, 01-04-2008 15:10:56  
You know I ground mags all the time, usually with a piece of baling wire, but these days a lot of folks are very safety conscious and would rather kill the engine prior to getting off the tractor. I've got where I hesitate to recommend something others might deem unsafe.



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JT

01-04-2008 16:41:52




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 Re: other, better ways to kill the engine in reply to KRUSS1, 01-04-2008 15:10:56  
Unless I am in a hurry, that is the way I kill all my mag fired tractors. I don't like to leave gas in the carb.
Jim



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