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Testing for spark


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#1 olds45512 OFFLINE  

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Posted October 18, 2016 - 10:33 AM

I was told about this the other day from a good friend. He was testing spark on a Kohler and like most people he pulled the plug and put it in the wire and left the plug rest against the head, the plug turned out to be junk but he had a used one that fit and wanted to test it before installing it. Once again with the plug resting against the head he turned the engine over, this time the raw fuel being pushed out the open spark plug hole ignited off the spark plug and caused what he described as a "big ass fire ball". Luckily it went out pretty fast and he was unharmed, makes me glad I use an inline spark tester.
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#2 DougT ONLINE  

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Posted October 18, 2016 - 10:46 AM

He must have had the engine pretty flooded to do that. I've been known to hold a lighter to the plug hole and turn the enine to suck the flame in. If they are flooded they dry out quick. I've had some good poofs but nothing I'd describe as a big fire ball. Must have had quite a bit of gas to do that.


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#3 Mark 149 J. ONLINE  

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Posted October 18, 2016 - 10:50 AM

In an automotive class, a group of students removed all of the spark plugs on a fwd. 4 cylinder dodge.  They didn't disconnect the coil and cranked the engine over.  The gas shot out of the spark plug hole covering the wall with gas.  The spark plug wire ignited all of the fuel setting the wall on fire.  It was concrete block but the paint was burning.  Someone grabbed  the fire extinguisher to put it out.  The instructor wasn't to happy but after a bit we all laughed about and learned an important less.


Edited by Mark 149 J., October 18, 2016 - 09:41 PM.

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#4 EricFromPa OFFLINE  

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Posted October 18, 2016 - 06:46 PM

My dumb butt pulled the plug on a OHV briggs engine that the carb had filled the crankcase with gas.Pulled the plug and cranked it over and stepped back and watched it burn.

 

Whole engine went up in flames.Block had a couple quarts of gas in it.Good thing I bought it very Cheap for the engine.

 

 

That was about 10 years ago.I'll never crank one over again to blow the gas out of the cylinder With the plug still in the lead and key turned On.I jump the solenoid over with the key OFF and Out of the tractor and No Spark plug hooked to the wire.Much safer but still a little risky.


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#5 70searssuburban OFFLINE  

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Posted December 20, 2016 - 08:40 PM

When not just hold the plug like I do get a small bite nothing bad lol

#6 WHdbJD ONLINE  

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Posted December 21, 2016 - 07:20 AM

Why not have the wife hold the spark plug wire?  That way you will be sure when it sparks !


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#7 DougT ONLINE  

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Posted December 21, 2016 - 04:38 PM

Why not have the wife hold the spark plug wire?  That way you will be sure when it sparks !

I used to have a chart that compared how high they jumped with how strong the spark was.


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#8 WHdbJD ONLINE  

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Posted December 22, 2016 - 07:47 PM

There's also a chart that compares the ratio of your laughter to how hard she smacks you.    :D


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#9 poncho62 OFFLINE  

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Posted December 23, 2016 - 06:43 AM

I thought thats what grandkids were for.............


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#10 Greasy6020 ONLINE  

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Posted December 23, 2016 - 10:20 PM

Why not have the wife hold the spark plug wire? That way you will be sure when it sparks !


Nope, siblings who don't listen!

Here hold this tell me if you feel anything!

Crank

$&@?#%¥\\#

That's why I like siblings who know nothing about motors.

#11 MiCarl ONLINE  

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Posted December 24, 2016 - 08:39 AM

When I was in college I helped a friend pull the camshaft from his '65 Mustang.  We worked on it in the parking lot of his apartment building.

 

There were a couple lifters down in their bores where he couldn't get hold of them.  He decided to crank the engine over to push them out but didn't think about the fuel pump and coil still being attached.  I don't recall much of a fire ball but there was a big burning puddle under his car on an asphalt parking lot.

 

He tried to extinguish the fire by pouring the radiator coolant on it - which only spread the fire.  I suppose the coolant under the gasoline probably did help keep the asphalt from burning.  I grabbed the extinguisher from my car and got it put out.  We had big mess of smoking green slime with soda from the extinguisher in it.  That's when the landlord pulled in - as I recall he didn't seem too pleased.

 

I don't think there were other cars around, it was probably a week day.  We got lucky on that point.


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