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Old 07-27-2020, 09:38 PM   #1
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Spark plug in very old lawn mower


So i am trying to help a neighbor that picked up a very old mower from a relative. The spark plug does not have a rubber boot, but has a sort of clip where the wire connects to the plug, and i cant seem to pull it straight off the plug without maybe damaging it. Is there a bit of a trick to remove that spark plug wire?
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Old 07-27-2020, 09:51 PM   #2
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Re: Spark plug in very old lawn mower


If that mower is really old there is a good chance the top of spark plug is a threaded stud with the wire loop placed on the stud and a threaded nut screwed down on it. See if there is knurling on the top of the spark plug metal part. If it as I suspect just simply unscrew the nut and remove wire.

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Old 07-28-2020, 08:06 AM   #3
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Re: Spark plug in very old lawn mower


Wow Rooster, I'm impressed! You're right, could very well be the case, but I haven't seen one of those in a long time, maybe at an auction and didn't pay that much attention to it, but sure wouldn't have considered the possibility.
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Old 07-28-2020, 10:18 AM   #4
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Re: Spark plug in very old lawn mower


Other than a few specialty plugs, I don’t think I’ve ever seen a spark plug without the threaded stud on top. That push-on terminal that comes on the plug will usually unscrew to reveal the threaded stud. ( I know some solid posts are made, just don't recall running into them)

I’ve seen some people just use the Push-on terminal as a nut to hold eye terminals on, but it better to replace them either with a Hex nut or knurled thumb nut.

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Old 07-28-2020, 10:42 AM   #5
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Re: Spark plug in very old lawn mower


Some form of straight and 90 push/pull plug wire ends have been around for a few decades. Sometimes need a little persuasion.


According to NGK some plug terminal ends are removable ( threaded ) and some aren't.
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Old 07-28-2020, 11:40 AM   #6
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Re: Spark plug in very old lawn mower


If it's really old there might be a metal grounding tab right near the plug - that was the only way to shut them off.
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Old 07-30-2020, 08:19 PM   #7
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Re: Spark plug in very old lawn mower


Sorry guys, got held up a few days, here is a photo of the spark plug in question. Oops, I cant figure out how to attach a photo. Wont allow me to copy and paste. Photo helps me, could not see it that clearly otherwise. Looks like a small clip holding the wire on the end of the plug. Sort of locks it on. How do i get it off without damaging it?
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Old 07-30-2020, 10:25 PM   #8
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Re: Spark plug in very old lawn mower


If it's what I'm thinking, you're going to unthread the tip of the tip of the plug, above where the wire is attached, like Rooster described. It might look like all one piece, and it might be on pretty snug, especially if it's been setting for a long time, but put a pair of pliers on it and I think it's going to come loose for you.
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