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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Help with Magneto Diagnosis - John Deere Type E, 3hp


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  #11  
Old 03-29-2015, 07:34:25 PM
guzzi1 guzzi1 is offline
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

I noticed you said the points were closed, they should be open, closed only when tripped. You're shorting out your ignition system. You ignitor springs are not installed correctly. I have just finished rebuilding the same engine.
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Old 03-29-2015, 08:41:41 PM
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

According to John Deere, you are INCORRECT. JD E's with the rotary mag and ignitor are Normally closed.

See attached photos from JD Service bulletin from 1934
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Old 03-31-2015, 12:45:31 AM
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

I know what the manual says but it works best with points open, I'm running 1 engine 3hp with mag/ignitor and the other 1.5hp battery/coil with ignitor and they start and run flawless. Try it you'll love it.
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Old 03-31-2015, 02:16:07 AM
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

As farmsc said,on a J D with mag, points should be closed. When they trip open they make spark. If using a batt and coil points should be adjusted open or you will drain battery very quickly, and if it stops and you don't catch it right away you can fry your coil. Don't ask how I know.
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Old 03-31-2015, 08:27:37 PM
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

Right or Wrong, mine ran perfectly fine with the points open.
https://youtu.be/ZUWEXXaJQ0g
Mag only put out about 1 1/2 volts cranking and barely 5 volts when running, but even burning off all the excess oil the previous owner had put in the crankcase it started and ran great with the points set open.

I set them open when I rebuilt the ignitor because I didn't know yet it the mag was any good or not and ran it on battery & coil the first couple times while I checked things out on it.

After getting it running and checking the mag voltage I switched it over from battery to mag while running and then shut it down to see if it would start on 1 1/2 volts cranking. It did so I left the points open.

I never tried it with them closed though to see if it ran any better one way or the other so I can't confirm or deny what guzzi1 says about them working "best with points open".

All I know is mine ran great open.

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Old 04-02-2015, 01:23:53 PM
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Exclamation Re: Help with magneto diagnosis - John Deere Type E, 3hp

Timing points opening is critical on a mag fired engine. The points must open at exactly the time of maximum magnetic flux. early or late - no spark. If the mag is off 1 tooth, you may not get spark. JD had a problem with weak coils, that's why you find many E type engines with associated mags. You should get a pretty bright flash, dragging the power output across the case of the mag at speed. If you don't get a good flash, I would suspect bad coils or poor brush connections. Even though the mag has fair voltage, if the current isn't there, you won't get good flash. Only way to tell is to remove the mag from the engine and test as I posted earlier. As an experiment, you might try rotating the mag 180 degrees and re-install. Some IHC M engines I have worked on had batter spark - the timing mark on the mag was slightly off center, enough to make a difference.
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Old 04-04-2015, 02:57:09 PM
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

Nforrester makes a great point, time your mag with the "L" rivet. My 3 hp mag timing mark was marked 1 tooth off on the gear which is critical to get the most voltage at the right time for a good spark.
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Old 02-24-2018, 02:05:53 PM
allenrhowe allenrhowe is offline
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

how do you re energize the magnets on a 1 1/2 hp john deere mag
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Old 02-25-2018, 12:54:34 AM
cobbadog cobbadog is offline
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Default Re: Help with magneto diagnosis - John Deere Type E, 3hp

You do need a 'recharger' to re energise your magnets. If you are in a club someone there should be able to help otherwise look in the 'sponsors' page for one near you that can service your magneto.
Or you can get the plans off this site to make your own recharger.
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