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Well she lives. The thread chaser i bought was the double ended type. But you cant get a socket onto it because the big end doesn't leave enough clearance. So i went with the V coil system. Got the engine at TDC so the valves were closed. Using the re-threading tool supplied i packed it with grease and after every 2 turns i pulled it out and removed the swarf and old grease then re-packed it.
Looking down the plughole i could see some grease and some swarf on the top of the piston. used a welding rod to pick up the worst of this. I then used a long blowgun and nitrogen gas at 6 bar (No compresser) along with a can of contact cleaner. Sprayed a load into the head then used the blowgun to blow everything out.
De-greased the v coil then applied high temp loctite. Tightened the plug down and left it overnight. Fitted new coil pack started it up.
No smoke or weird noises. Revved it a few times then took it out for a drive for 10 miles around local roads.
temperature ok. No smoke or weird noises. The only issue is the engine management light stays on. But the car runs fine.
I know i've been very lucky to not do any further damage.
Thanks for the advice supplied regarding my options.
Engine light will have to be reset with a tool you hook up to it, or you vcan try unhooking the battery for a while. Could help with five minutes, but a proper reset of half an hour will do it better i think.
If anyone is still interested, Wurth make a product called Time Sert.
Never tried them myself but if Edd China is to be believed, they're superior to heli coils.
Here's a link to him demo-ing them:
Readily available on ebay.
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