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Checking for spark on Tecumseh hh120


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#1 Greasy6020 ONLINE  

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Posted July 08, 2016 - 02:44 PM

I have a Tecumseh hh120 that I might be selling. The tractor it currently is in (massey ferguson 12 gear) has no keys.

Any ideas on how to check for spark in my situation?

#2 boyscout862 ONLINE  

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Posted July 08, 2016 - 03:05 PM

The engine manual will have a troubleshooting section that will tell you how. You can download the manual from our Manuals Section. Good Luck, Rick


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#3 secondtry OFFLINE  

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Posted July 08, 2016 - 03:34 PM

    I don't know the tractor, but the simple answer is to pull the plug lay it against the block and spin the engine and look for spark. Is this a mag type ignition. I think one key will fit almost every gt i have. The ignition switch on my Sears tractor didn't work when I got it, so to check out the engine I removed the hot or power wire from the coil, hooked up a hot jumper from the positive post of the battery and jumped the solenoid Started right up. Without much more information the answer to your question will require some one with direct experience with that particular engine and tractor. Some times everything looks the same but the serial # makes a big difference.  Pictures will help.  Don  


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#4 MH81 ONLINE  

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Posted July 08, 2016 - 06:27 PM

Do NOT just lay it on the block or turn it over without a plug, grounded.

Assuming this is a CDI, damage can happen with out a plug.
On the front of the engine, there often is a little piece of insulating plastic with wires attached. Disconnect the on that goes to the key. On the later ones, they had a harness you could unplug.

Keep in mind, you will have to reconnect to kill spark.
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#5 MH81 ONLINE  

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Posted July 08, 2016 - 06:31 PM

Oh, and you can make a key very easily. As a matter of fact, I use a screwdriver often on my tractors when a key comes up missing.
Either cross keys (Indak) or MF keys are available
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#6 MFDAC OFFLINE  

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Posted July 10, 2016 - 07:45 PM

Do NOT just lay it on the block or turn it over without a plug, grounded.

Assuming this is a CDI, damage can happen with out a plug.
On the front of the engine, there often is a little piece of insulating plastic with wires attached. Disconnect the on that goes to the key. On the later ones, they had a harness you could unplug.

Keep in mind, you will have to reconnect to kill spark.

Alan, what is the difference of an SSI and a CDI on a HH120? I'm about to scrap the stuff I had for sale as no one will even offer anything. Maybe I don't even know what it was I tried to sell?

 

DAC


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#7 MH81 ONLINE  

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Posted July 10, 2016 - 09:02 PM

Same thing, but they had 3 different systems and they aren't interchangable.
They all require their own coil/pickup style. Without, kind of banking on if the pickup is ok
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#8 ducky OFFLINE  

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Posted July 10, 2016 - 10:59 PM

Alan, what is the difference of an SSI and a CDI on a HH120? I'm about to scrap the stuff I had for sale as no one will even offer anything. Maybe I don't even know what it was I tried to sell?

 

DAC

Man do not scrap the ignition on those.  They are pricey and can be repaired.


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#9 MolonLabe OFFLINE  

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Posted July 11, 2016 - 06:08 AM

Ed Stoller has some great Tecumseh electronic ignition troubleshooting and repair tips http://home.earthlin...toller/id9.html


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#10 OldBuzzard ONLINE  

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Posted July 11, 2016 - 08:27 AM

For checking for a spark, nothing beats an inline spark plug tester.

 

A plug that will 'spark' when using the pull it, ground it, and crank the engine will sometime not spark when the plug is under compression.

 

You can find them in a lot of places.  Auto parts stores, Amazon and even Walmart.

 

http://www.walmart.c...dingMethod=p13n


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#11 Greasy6020 ONLINE  

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Posted July 11, 2016 - 11:15 AM

Well, I think I am going to jerry rig a rope start on the massey ferguson 12, to test for spark and sell the engine.

I'd like to repower it to something more reliable.

#12 MFDAC OFFLINE  

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Posted July 11, 2016 - 07:00 PM

Man do not scrap the ignition on those.  They are pricey and can be repaired.

Thank-you for the encouragement, Ducky! I never even got any offers in my for sale ad on this site. I may have priced it to high but price drops didn't attract any interest. One guy is now considering. If I was to keep it out in a shed, it will get ruined anyway.

 

DAC


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#13 Greasy6020 ONLINE  

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Posted July 11, 2016 - 10:06 PM

Does anyone think that the important ignition bits and pieces that are important to get spark will have been ruined if the tractor/motor sat outside for who knows how long?

What can I use to ground out the spark, so I can see it? I know there are spark testing units, but I'm not sure my dad has any in his tickle trunk...

Would grounding it into unsuspecting humans be acceptable?

#14 MH81 ONLINE  

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Posted July 11, 2016 - 10:29 PM

There is absolutely no way to know if time or environment can cause a CDI to go bad

Obviously the more wet, the higher the chance.

Best first test is to check the oil, remove the original plug (no compression), add a little oil for the rings, test roll over 4 revs by hand, vise grip a spark plug to metal, make sure the kill wire isn't shorting, and roll it over quickly.
When they work, it's kinda hard to miss. Wicked spark as a rule.
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#15 Greasy6020 ONLINE  

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Posted July 12, 2016 - 09:30 AM

Ok. I can do that.

Thanks everyone!!!

Is it ok to ground it out on the engine block?

Edited by Greasy6020, July 12, 2016 - 09:31 AM.





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