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9N ignition woes


 
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Anonymous
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PostPosted: Sun Jun 17, 2007 6:34 am    Post subject: 9N ignition woes Reply to specific post Reply with quote

My FIL brought in the 9N belonging to the guy he buys hay from. It has intermittent spark loss. I've used a test light on it; seems to have power to and through the key switch and down to the coil, but no spark. I've sanded the points and the cap looks clean. Is there a way to test the condensor? Is there something else I'm missing?

It's a 6 volt positive ground system.

Thank you for your time. Opinions and suggestions are appreciated.

Thanks,
Anthony
 
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Bruce (VA)
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PostPosted: Sun Jun 17, 2007 6:47 am    Post subject: Re: 9N ignition woes Reply to specific post Reply with quote

It's probably not the condenser. When the condenser goes, it will usually burn the points up first. Were the points pitted? First, check for continuity inside the distributor. It is very easy to ground the wire to the condenser when you adjust the points. Check the gap; .015 on the frontmount. Next, remove the cork gasket under the coil and reinstall the coil. Put a piece of folded paper under the coil bail to hold it tight. Reconnect the wire on the top of the coil. Try it like this and if it cranks and runs you will know the spring pigtail needs to be stretched or the other flat tab on the coil needs adjusting.
 
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A. Bohemian
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PostPosted: Sun Jun 17, 2007 7:30 am    Post subject: A Comment and A Few Suggestions Reply to specific post Reply with quote

The comment: intermittent electrical problems can be the Devil's Very Own to solve.

I'm going to assume you're not a newbie or tvy syn wouldn't have brought the tractor to you in the first place, so I'll leave out my usual screed about the dashboard ammeter, assuming you know how to use one; bearing that in mind, hear are the suggestions:

(1) A test light can spot some STATIC ignition switch malfunctions, but not all DYNAMIC ones. Try troubleshooting the switch by replacing it. If you don't want to spend the money, you can try putting a jumper across it; but this will not find dialectric breakdown of the switch insulation.

(2) If replacing the switch doesn't do anything, all what Bruce VA said.

(3) If none of what Bruce VA said helps, troubleshoot the coil by replacing it. Again, the test light will only help you check for continuity; it cannot find dialectric breakdown of the insulation between the windings, a common failure mode for coils after the engine has had a while to heat up.

Hope all this helps. If by chance you DON'T know how to use the dashboard ammeter to troubleshoot your problems, well, I admit it's a "hobby horse" of mine, but I am happy to explain it.
 
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A. Bohemian
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PostPosted: Sun Jun 17, 2007 7:31 am    Post subject: A Comment and A Few Suggestions Reply to specific post Reply with quote

The comment: intermittent electrical problems can be the Devil's Very Own to solve.

I'm going to assume you're not a newbie or tvy syn wouldn't have brought the tractor to you in the first place, so I'll leave out my usual screed about the dashboard ammeter, assuming you know how to use one; bearing that in mind, hear are the suggestions:

(1) A test light can spot some STATIC ignition switch malfunctions, but not all DYNAMIC ones. Try troubleshooting the switch by replacing it. If you don't want to spend the money, you can try putting a jumper across it; but this will not find dialectric breakdown of the switch insulation.

(2) If replacing the switch doesn't do anything, all what Bruce VA said.

(3) If none of what Bruce VA said helps, troubleshoot the coil by replacing it. Again, the test light will only help you check for continuity; it cannot find dialectric breakdown of the insulation between the windings, a common failure mode for coils after the engine has had a while to heat up.

Hope all this helps. If by chance you DON'T know how to use the dashboard ammeter to troubleshoot your problems, well, I admit it's a "hobby horse" of mine, but I am happy to explain it.
 
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A. Bohemian
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PostPosted: Sun Jun 17, 2007 7:33 am    Post subject: Sorry for the Double Post Reply to specific post Reply with quote

Sorry nm
 
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Anonymous
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PostPosted: Sun Jun 17, 2007 8:03 am    Post subject: Re: 9N ignition woes Reply to specific post Reply with quote

kinda new here and dont wanna step on any toes but in my 45+ years of turnin wrenches for a living i've seen plenty of condensors go bad with no tell tale signs.
Rotunda had a condensor tester years ago made by Ottatawnwa Tool Co in Iowa...dont know where you'd get one today except ebay or snapon guy mite know.
its easier,cheaper,and faster to just replace the points/condensor if the points look bad...and you cant rule out a brand new condensor being bad straight from the box.
good luck
 
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Den N Ms
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PostPosted: Sun Jun 17, 2007 8:31 am    Post subject: Re: 9N ignition woes Reply to specific post Reply with quote

Antohny,you said I"ve sanded the points and the cap looks clean. Is there a way to test the condensor? Is there something else I"m missing?

Yes if you cleaned the points with sandpaper and did not clean the grit out and polish them after sanding them or it wont fire cotectly.You really need to replace the points.If You really have to sand them to get by ,use some (600) grit only, wet or dry paper ,then wipe,blow all grit out then polish them with a dollar bill,matchbook cover.
 
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Anonymous
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PostPosted: Sun Jun 17, 2007 7:48 pm    Post subject: Re: 9N ignition woes Reply to specific post Reply with quote

Read the whole thread An' I gotta go with Bruce on this one. A bad condensor will burn the points sumpin' awful,and the ignition switches are notoriously problematic. I battled one for the better part of a summer one year until a loss of power lurch caused my knee to bump the key and.... Eureka! It took off again! Felt like a moron because there are plenty of these posts on the board, but unlike you, was too proud to ask for help... Dell recommends replacing crappy switch with sealed marine duty toggle switch...With all the corvettes out there, who's gonna steal a 60 yr. old tractor? I've yet to pull the key on mine, and really don't see the point. Anyone who knows how to drive one could hotwire it in a heartbeat.
 
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Anonymous
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PostPosted: Sun Jun 17, 2007 7:58 pm    Post subject: Re: A Comment and A Few Suggestions Reply to specific post Reply with quote

No, I wouldn't call myself a newbie, but I'd hesitate to say 'expert' as well. Never hurts to learn something new or different. If you don't mind explaining, I don't mind listening!

Thanks,
Anthony
 
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