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Stripped spark plug threads (Read 84 times)

Don G YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 6	Stripped spark plug threads 03/11/21 at 08:57:08 My daughters boyfriend changed his spark plug and found it had a heli-coil. Is there enough aluminum in the head to be retapped to a bigger diameter sparkplug or can the existing heli-coil be removed and a new one installed? as it is the threads are very poor. Will he have to buy a used head?
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gtenginerd Junior Member Offline SuzukiSavage.com Rocks! Posts: 88 MO	Re: Stripped spark plug threads Reply #1 - 03/11/21 at 09:05:04 Had to look up what a helicoil was. Looking forward to the replies. For the lazy and equally uninformed https://www.stanleyengineeredfastening.com/brands/optia/heli-coil
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Gary_in_NJ Serious Thumper Offline LS650 Cafe Racer Posts: 2633 Amongst the Twisty Roads	Re: Stripped spark plug threads Reply #2 - 03/11/21 at 09:21:33 Me, I'd replace the head. It's gotta come off anyway for the helicoil work. But that's me. A new helicoil should work fine, but there is always the possibility of future troubles.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Stripped spark plug threads Reply #3 - 03/11/21 at 09:27:39 You tube South main auto Dude fixed a hole the plug got loose in and the compression shot it out, Tool called Thread saver Not helicoil Piston low grease packed in the flutes Turn it some Remove Wipe Repack Watch South main auto Videos
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5106 Manteca , CA Gender:	Re: Stripped spark plug threads Reply #4 - 03/11/21 at 10:48:31 Have a machine shop look at it before buying another head. It might be more cost effective to have a engine building machine shop do the work with a threaded insert to repair it to OEM spark plug. Threaded insert is a high quality repair in comparison to a helicoil !
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ohiomoto Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2772	Re: Stripped spark plug threads Reply #5 - 03/11/21 at 11:16:32 This one is for JOG
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Stripped spark plug threads Reply #6 - 03/12/21 at 20:14:04 That is what I watched.
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Re: Stripped spark plug threads
Reply #7 - 03/13/21 at 02:42:39

Many years ago I bought a 1964 VW bug. I was just a kid and didn't know much about being a mechanic and I only had a few tools to work on my motorcycle. I was driving along and I heard a loud explosion from my engine - then the engine made a strange popping sound......it had blown out one of the spark plugs.

I called a fellow I knew who worked on VW's, and he said this was pretty common and to drive the car over.....it wouldn't hurt it to drive 5 miles on 3 cylinders.

When I got there he used the same kind of tool displayed in the video to install an insert. Because the head was aluminum they did not use any grease - the aluminum shavings were blown out using a small rubber tube on the end of an air hose - and they had me start the engine and run it on 3 cylinders before they put the spark plug back in to blow any aluminum shavings out. I drove the car for several years after that without a problem. (I don't know if the grease method is superior).

You might want to check with engine machine shops, motorcycle shops and lawn mower shops to find somebody who has the tool and the correct size inserts.

If not......I have some used heads in good used and/or refurbished condition I can sell.

Someday I will be old......But not today!

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Tocsik Serious Thumper Offline the singularity Posts: 1163 Denver, CO Gender:	Re: Stripped spark plug threads Reply #8 - 03/13/21 at 09:24:54 I wish I could find a mechanic like this guy in my area. Seems like a good and honest man.
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