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[Andy B]

Helicoils are crap on anything other than something that is bolted up after repair & then never ever touched. Although I've never used a spark plug Time-sert I've used loads of M5 M6 etc Time-serts, their advantage is that the thread is a solid one piece insert that doesn't unwind from the hole.
http://www.youtube.com/watch?v=Ntiy8L97Nco

[russ0205]

Take the risk helicoil it then sell it on the same as a lot of traders do, In a lot of opinions you havn't bodged it,

 

[henryd]

Helicoils are crap on anything other than something that is bolted up after repair & then never ever touched. Although I've never used a spark plug Time-sert I've used loads of M5 M6 etc Time-serts, their advantage is that the thread is a solid one piece insert that doesn't unwind from the hole.
http://www.youtube.com/watch?v=Ntiy8L97Nco

agreed on helicoils,no good on threads that will be used again,not come across the time-sert's before but they look pretty good

[Entwood]

Helicoils are crap on anything other than something that is bolted up after repair & then never ever touched. Although I've never used a spark plug Time-sert I've used loads of M5 M6 etc Time-serts, their advantage is that the thread is a solid one piece insert that doesn't unwind from the hole.
http://www.youtube.com/watch?v=Ntiy8L97Nco

Agreed  time-sert is the way to go ..

http://www.timesert.com/

and specifically for plugs

http://www.timesert.com/html/sparkplug.html

and for previously bodged repairs ...

http://www.timesert.com/html/bigsert_sparkplug.html

[omegod]

Helicoils are crap on anything other than something that is bolted up after repair & then never ever touched. Although I've never used a spark plug Time-sert I've used loads of M5 M6 etc Time-serts, their advantage is that the thread is a solid one piece insert that doesn't unwind from the hole.
http://www.youtube.com/watch?v=Ntiy8L97Nco

Seen the timeserts Andy but not come across an engineering shop who has said they would have a go, they all seem to be helimad you know anyone who could do it down your way?

[Andy B]

...,not come across the time-sert's before but they look pretty good

They're not cheap though. I've a set that covers M5 M6 M8 M10 & M12 which I believe cost my previous employer around £300 ............. part of the redundancy package 

[Andy B]

Helicoils are crap on anything other than something that is bolted up after repair & then never ever touched. Although I've never used a spark plug Time-sert I've used loads of M5 M6 etc Time-serts, their advantage is that the thread is a solid one piece insert that doesn't unwind from the hole.
http://www.youtube.com/watch?v=Ntiy8L97Nco

Agreed  time-sert is the way to go ..

http://www.timesert.com/

and specifically for plugs

http://www.timesert.com/html/sparkplug.html

and for previously bodged repairs ...

http://www.timesert.com/html/bigsert_sparkplug.html

You were busy Nige! 

[Entwood]

Helicoils are crap on anything other than something that is bolted up after repair & then never ever touched. Although I've never used a spark plug Time-sert I've used loads of M5 M6 etc Time-serts, their advantage is that the thread is a solid one piece insert that doesn't unwind from the hole.
http://www.youtube.com/watch?v=Ntiy8L97Nco

Agreed  time-sert is the way to go ..

http://www.timesert.com/

and specifically for plugs

http://www.timesert.com/html/sparkplug.html

and for previously bodged repairs ...

http://www.timesert.com/html/bigsert_sparkplug.html

You were busy Nige! 

I try .....  ( or is it I'm trying ??         )

[Andy B]

....
Seen the timeserts Andy but not come across an engineering shop who has said they would have a go, they all seem to be helimad you know anyone who could do it down your way?

Sorry, afraid not. I only know about the Time-sert plug inserts while looking for the 'normal' inserts part numbers.
Maybe contact Time-sert asking who they've supplied in the Liverpool-ish area  :-/ :-/ :-/

[Entwood]

Saw timeserts used a few years back on an Imp engine used for saloon racing. Apparently after a plug change one of them was cross threaded and it "blew", damaging the thread. 

Done in-situ and the car was racing again in less than 2 hours.

 IIRC the major downside was the cost of the tools.. the inserts themselves were not too expensive ... but the tools .... 

Re-tapping the hole was done in very small amounts and copious volumes of grease were used to collect swarf .. the guy obviously knew what he was doing.

I "believe" they are considered a DIY method not neccessarily a workshop one .. but the cost of the tools might preclude a "one off" ..

[mantagte]

have piston at the top have it tapped and helicoiled
then use hoover with adapted pipe we use 8mm fuel pipe taped to hoover pipe hoover debris out

[Andy B]

..... but the cost of the tools might preclude a "one off" ..

but the cost of the Time Sert tools vs the price of A N Other head and fitting it etc  :-/ :-/ :-/

[Andy B]

there are a few spark plug Time Sert kits here ....  but as said, they're expensive.

http://shop.ebay.co.uk/i.html?_nkw=time+sert&_sacat=0&_odkw=plastic+welder&_osacat=0&_trksid=p3286.c0.m270.l1313