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Poor spark - Not no spark.

poor spark

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#1 Endmill OFFLINE  

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Posted September 26, 2016 - 06:11 PM

Hi Everyone

I have a mystery. I have a 1976 7016H Simplicity. It has a 16 H/P 326431-0190-01 engine. It has poor spark. If I hold on to the end of the spark plug wire with my hand, while turning over the engine, I get a slight jolt from the wire. It’s not much of a jolt at all. I have an in line spark plug checker, the type with a light bulb in it. There isn’t enough voltage to light the light bulb. I set the sparkplug checker on another one of my tractors, the light bulb glows as it should.

I have replaced the coil, the voltage regulator and it has a new wiring harness. The coil is gapped at .012. I gapped it at different times .008 through .014 with feeler gauges, and the spark did not improve. It has a new electronic ignition module. I tried the electronic ignition on another tractor, and it worked fine. I tried the points and the spark did not improve. While turning the engine over, I grounded out a new spark plug. It had no spark. I grounded out the sparkplug wire against the engine block the only spark that I could see is when I completely grounded out the wire. If I pulled the wire away from ground, it would not spark. No spark jump. I removed the nut on the flywheel and then examined the 3/16 key. The key-ways on the crankshaft and the flywheel lined up so the key has not sheared. So I now can presume that the timing is still good. I tried to remove the flywheel today with a gear puller that applied force to the crankshaft, and with 5/16-18 threaded bolts to the flywheel. Not a 3 jaw type gear puller. It would not move even after heating the flywheel with a propane torch. So I can presume that the flywheel has not rotated on the crankshaft. I am not going to attempt to remove it unless I have a good reason.

I would appreciate any advice on this. Does anyone have any ideas for me? Thanks in advance for the help and for reading this through.

Steve



#2 New.Canadian.DB.Owner OFFLINE  

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Posted September 26, 2016 - 06:39 PM

Condenser?


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#3 poncho62 ONLINE  

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Posted September 26, 2016 - 06:40 PM

Are the magnets on the flywheel rusty?

 

What are the points set at....are they pitted?



#4 MiCarl OFFLINE  

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Posted September 26, 2016 - 06:48 PM

The position of the flywheel on the shaft affects timing, not spark quality.  You can move on from there.



#5 chieffan OFFLINE  

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Posted September 26, 2016 - 06:54 PM

You have an electronic ignition module and points both?


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#6 Endmill OFFLINE  

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Posted September 26, 2016 - 07:08 PM

I tried using the points as an alternative without any luck. 



#7 Endmill OFFLINE  

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Posted September 26, 2016 - 07:10 PM

Also sanded smooth the magnet on the flywheel. Also blew out the air gap between the aluminum insert on the flywheel and the cast iron flywheel.

Thanks everyone

Steve



#8 zippy1 OFFLINE  

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Posted September 26, 2016 - 11:35 PM

How do you gap a coil?

Did you check the ground to make sure it was good? Static time it is the best way to be accurate.



#9 Cvans OFFLINE  

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Posted September 26, 2016 - 11:50 PM

Are the magnets getting weak?

I didn't notice, did you change the plug wire?


Edited by Cvans, September 26, 2016 - 11:51 PM.


#10 secondtry OFFLINE  

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Posted September 27, 2016 - 12:03 AM

I don't know how to link to it but there is a manual available if you follow the manuals tab at the top of this page. Don



#11 Endmill OFFLINE  

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Posted September 27, 2016 - 05:29 AM

I gaped the coil with shim stock. Sometimes they are called feeler gauges, It maybe a New England term, they are strips of metal that are different thicknesses.

I waved my 5/8 wrench over the magnet, it pulled it in from roughly an inch away. I don't know if that's sufficient.

The new coil came with a new plug wire.

I will try to hunt down a manual.

Is there a particular manual that I should look for?

Steve



#12 MH81 ONLINE  

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Posted September 27, 2016 - 06:23 AM

When using points, I don't see mention of the condenser. That's a big culprit in weak spark scenarios

#13 KennyP ONLINE  

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Posted September 27, 2016 - 06:27 AM

Here's a link to the owners manual. And this should be the parts manual.



#14 Endmill OFFLINE  

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Posted September 27, 2016 - 07:01 AM

By the way what is static time?



#15 Endmill OFFLINE  

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Posted September 27, 2016 - 07:04 AM

I am using an electronic ignition module. That bypasses the points and condenser.

I like to think it works better.

.


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