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Discussion Forum

Helicoil how to use

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Dave K. (Fl)

07-22-2002 17:59:30




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I have an engine with stripped sparkplug threads in the head. I have heard mention the use of helicoils to correct this. I am not familiar with using them so would like to know where they are available and do they require any special jigs, tools or preparation to use? I can mike the old plug sizes, I think they are 14 mm but will check to be certain. Any help, ideas etc appreciated




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buck

07-22-2002 19:22:44




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 Re: Helicoil how to use in reply to Dave K. (Fl), 07-22-2002 17:59:30  

go to your auto parts store and tell them your problem. The tool is one piece which cuts out the old threads and cut the new and you put the insert on the new plug and screw it in. Now for the actual work make sure that the piston is down so there is no chance of hitting the piston with the tool and coat the tool with grease or the like to hold the shavings and yes vacuum it out before replacing the plug.

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Bill Hires

07-22-2002 18:06:29




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 Re: Helicoil how to use in reply to Dave K. (Fl), 07-22-2002 17:59:30  
I buy mine at an auto parts store/machine shop. You will have to buy the correct heli-coil, drill bit and insrtallation tool. I use a large shop vacuum to keep the shavings from entering the combustion chamber.



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Mark Kw

07-23-2002 07:55:07




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 Re: Re: Helicoil how to use in reply to Bill Hires, 07-22-2002 18:06:29  
Personally, if you have room for the heli-coil insert, you have room to make new threads for the next size larger spark plug. I have not used heli-coils for plug holes but have heard of them blowing out rather often. If you cannot get a bigger diameter plug in the same type, I would strongly suggest using a solid thread insert like "nut-certs" rather than an open spring type like "heli-coil". I did see heli-coils that blew out of glow plug holes in a diesel engine and destoyred any hope of salvaging the heads.

One trick to use is ensure the exhaust port on the cylinder is open and attach an air hose to the exhaust pipe so it blows the chips out of the piston area. Caution an good eye protection is a must when doing this as all the crap will be flying back at you out of the hole. Test plug adapters work very well for connecting the air hose to the pipe.

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