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Farmall & IHC Tractors Discussion Forum
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H Burning Points

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Walter

11-11-2003 15:03:55




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Hello,
I recently bought an H which belonged to my father. It runs good except for burning points. I have set the gap to .018 (the best I can remember), but I don’t think gap is the problem. There is some side play in the distributor shaft. Is this my problem and how do I fix it if it is?

Thanks,
Walter




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riverbend

11-14-2003 18:49:48




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 Re: H Burning Points in reply to Walter, 11-11-2003 15:03:55  
I had trouble with my H burning the points until I added a second condenser. Connect the lead to the wire to the coil on the outside of the distributor and trap the clamp under the coil mounting bracket.



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dlp

11-12-2003 17:05:05




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 Re: H Burning Points in reply to Walter, 11-11-2003 15:03:55  
The coil needs to be for a point system, not an electronic ignition. The ohm value is different. Just a thought.



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Allan

11-12-2003 04:03:10




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 Re: H Burning Points in reply to Walter, 11-11-2003 15:03:55  
Walter,

I just happened to think of something.

The primary side of the coil is not wired backwards is it?

That will cause points to pit really bad as they are "cross hand-shaking" with that condenser (the leveling effect of the condenser is reduced and from an electrical standpoint is almost 'removed' from the system).

Another thing: Is your overall system voltage running way too high? This usually shows up at the battery first (boiling), but can sometimes go unnoticed for awhile.

At a high idle, the regulator ought to hold a 12v system at around 14.2v; a 6v system at roughly 7.5.

Lastly, is that distributor shaft *real bad? Is the tractor running poorly? Can you move the shaft to the point of actually opening and closing the points? Is the dwell erratic?

Is this a performance problem we are fighting or is it just eating a lot of points?

Just an idea or two,

Allan

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walter

11-12-2003 04:27:44




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 Re: Re: H Burning Points in reply to Allan, 11-12-2003 04:03:10  
It is wired correct I have downloaded diagrams. The tractor is just runnin on a 12v battery that I recharge - I plan to convert to alternator. I can wiggle the distributor shaft around it is not a whole lot, but i think it could effect the points.



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Doug in OR

11-11-2003 20:53:57




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 Re: H Burning Points in reply to Walter, 11-11-2003 15:03:55  
Generally, this indicates one of these three things: Bad coil. Bad condensor. Wrong voltage to the coil. If you are running 12 volts, you may need a resistor in series with the coil. If you are running a 6 volt system, it will be either the coil (partially shorted) or the condensor. If you have a *good* ohmmeter, check the resistance across the coil leads. It should show about 1.7 ohms. Considering the small value of resistance, you need a good, accurate meter. If you do not have a good ohmmeter, change the condensor. If that does not cure the problem, it leaves you with not much else to change except the coil.

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TomH

11-11-2003 16:17:20




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 Re: H Burning Points in reply to Walter, 11-11-2003 15:03:55  
How long does it go on a set of new points? Old ones that have been filed don't last at all.



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walter

11-11-2003 20:53:04




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 Re: Re: H Burning Points in reply to TomH, 11-11-2003 16:17:20  
it burns them fairly quickly. I use new points don't think i can file them straight and smooth enough.



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Rich

11-11-2003 15:46:12




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 Re: H Burning Points in reply to Walter, 11-11-2003 15:03:55  
Point gap on Dist.should be .020. Are you runing 12 volt? If so you need a resistor in the line from switch to coil if you are still useing the 6 volt coil. If you are useing 12 volt coil put res.between coil and dist. Just my thoughts.



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Allan

11-11-2003 16:16:36




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 Re: Re: H Burning Points in reply to Rich, 11-11-2003 15:46:12  
Walter,

I agree with Rich. It is not the "gap" so much that is burning your points, but rather it is one of two things. Either you have too much voltage, like Rich says or you have a defective condenser.

People seem to think you can just change these old gals over to 12v and dump the resistor.

That's fine if you only run the tractor a few hours a year. But if you plan on working it, the resistor has to be there or the problem you are experiencing shows up. That voltage across the points has to be kept as low as possible for long point life.

Also, against what everyone seems to think, that condenser does not need to be replaced every time you change points....there is nothing there to wear out. As far as the circuit is concerned, it is nothing more than a tiny storage battery.

When you find one that wears points in a nice long-life(d) fashion, keep it.

Tryin' to help,

Allan

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Walter

11-11-2003 20:50:55




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 Re: Re: Re: H Burning Points in reply to Allan, 11-11-2003 16:16:36  
I have replaced the condenser and it has a resister on the wire between the coil switch and the coil.



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Wayne Swenson

11-11-2003 21:28:15




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 Re: Re: Re: Re: H Burning Points in reply to Walter , 11-11-2003 20:50:55  
Is the resister the correct ohm value?
Get a new one @ NAPA & see if it solves the problem.



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Randy Osterberg

11-11-2003 17:37:04




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 Re: Re: Re: H Burning Points in reply to Allan, 11-11-2003 16:16:36  
Look at the condenser as your problem. It is actually a capacitor that acts as a "shock absorber" across the points to cut down on arcing.



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