Stripped spark plug threads vs Perma-Plug - Snowblower Forum : Snow Blower Forums
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post #1 of 11 Old 01-29-2017, 06:42 PM Thread Starter
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Stripped spark plug threads vs Perma-Plug

I'm rather impressed with this system. I recommend it to anyone needing such a thing.
Head was given to me with all the plug threads completely missing. They had no interest in repairing the head and found a new one. I wanted to see how well this works so I bought a repair kit from


I didnt take any before pics, but these are the new threads that were cut with the tool that does not require drilling. There were a ton of shavings and I personally couldn't imagine trying this with the head installed.

I greased the threads on the spark plug, and used thread locker on the head and installed the insert good and tight. I left it like this for a few hours while the lock-tite cured. Then I removed the spark plug and flared the top of the insert with the included tool to ensure it would lock into place.

Top side of insert installed but not flared.

The stuff in the kit including some inserts and the tool that sets the teeth at the top of the insert when driven with a hammer after installation.

Last edited by dbert; 01-29-2017 at 07:47 PM.
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post #2 of 11 Old 01-29-2017, 06:52 PM
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Nice job! I grease the threads of every plug I put in. Hoping it wont happen to me.
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post #3 of 11 Old 01-29-2017, 06:52 PM
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Those are a great tool.... for Aluminum anyway. I believe they first came out in the 90's, and were used as a solution for the Ford engines that spit out the spark plugs. Bullet-proof design. By design, it will draw the tap in straight and concentric. There is a ton of chips. That's when I learned of the shaving cream trick.....Bring the piston to TDC, Firing, fill cylinder with shaving cream and tap away. Blow the cream out and install sleeve. It's only Aluminum chips....any left over will burn up or blow out. I still use them...On the Older Ford's and Small Engine Cylinder Heads. Time and Money Saver. Jay
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post #4 of 11 Old 01-29-2017, 08:12 PM
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How does this compare to a Helicoil?
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post #5 of 11 Old 01-29-2017, 08:25 PM Thread Starter
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I think Helicoil makes something exactly like this for plug repair. It's not the typical coiled wire spring looking thingy
that I associate with Helicoil. These are solid sleeves with teeth on the outside end that get driven into the tapped material.

Last edited by dbert; 01-29-2017 at 08:31 PM.
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post #6 of 11 Old 01-29-2017, 08:56 PM Thread Starter
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These inserts look like this.
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post #7 of 11 Old 01-30-2017, 11:40 AM
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The advantages of the Perm-Plug, is that it is a 1 piece sleeve.....solid insert. The last step, is to use a tool to swage it in place...a slight flare at the top, to stake those little teeth into the aluminum. They come in 3 different lengths to accommodate different Spark plugs. And the Biggest Advantage as far as I'm concerned, there is no 'tab' to break off when finished. Not a big deal with the cylinder head on the bench, but if repairing in place, That's the piece I don't like floating around in the cylinder. GLuck, Jay
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post #8 of 11 Old 01-30-2017, 08:35 PM
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Way better than a helicoil.The timesert repair is just like the perma -plug and works great also.I also put a drop of red locktite on the insert.Never had one come out.I've used them on everything from power equipment to car and truck engines.Nice job dbert
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post #9 of 11 Old 02-03-2017, 06:07 AM
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Time-Sert is another brand of sparkplug insert for stripped threads repair.
Thanks for sharing this.
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post #10 of 11 Old 02-09-2017, 07:26 AM
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Had a head which was cross threaded awhile back. Used a back- tap to repair it without re moving the head.


Worked good to correct the threads. Tool was about $50. but way cheaper than a new head.
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