Threads in plug hole are gone!

scoops · Post by **scoops** » Sat Dec 13, 2008 4:20 pm

Hi, I made a right mess of a spark plug change today, disaster, I over-tightened a plug and the threads are gone in the hole!

Is there anything I can do with this??

Any help appreciated

Post by **CMSMJ1** » Sat Dec 13, 2008 4:30 pm

OOPS.

Bit of a nightmare that - you can possibly helicoil the head and get it sorted that way - bit of a mission though and would likely involve having the the heads off.

It can be done...so all is not lost.

Gullarm76 · Post by **Gullarm76** » Sat Dec 13, 2008 4:30 pm

Hi

I have a similar problem with my clutch plate cover. I have been advised to use a helicoil set. They are quite cheap around Â£12.00 on ebay.

I do not know if this would be suitable for spark plugs, you may need to check it with a mechanic or someone on this site.

Hope this helps a little.

Post by **brooky** » Sat Dec 13, 2008 4:39 pm

if you have to take the heads off i would consider replacing them, helicoiling would work but a secondhand head would be better option, is it triarm or gullarm?

scoops · Post by **scoops** » Sat Dec 13, 2008 4:55 pm

brooky wrote:if you have to take the heads off i would consider replacing them, helicoiling would work but a secondhand head would be better option, is it triarm or gullarm?

Its a tri arm modle. Would replacing the head be costly do you reckon?

scoops · Post by **scoops** » Sat Dec 13, 2008 5:44 pm

It seems the plug has actually sheered, and the threaded bit is still in the engine...

Anyone ever get this before?

Post by **lazcbr29** » Sat Dec 13, 2008 5:59 pm

seen it on a m8's aprilia rs, obv easier to get the head off one of them,
but get the head off soon as, make sure no shit gets dropped down into the piston
then with the head off heat it up to quite a high temp and then try some form of removing tool.
laz.

scoops · Post by **scoops** » Sat Dec 13, 2008 6:09 pm

Cheers lads il see how I get on tomorrow

Post by **Jon** » Sat Dec 13, 2008 8:24 pm

scoops wrote:It seems the plug has actually sheered, and the threaded bit is still in the engine...

Anyone ever get this before?

No need to pull the head off.

Use and easyout to screw the sheared off section out of the head, they are pretty cheap.

http://www.dansmc.com/easyout.jpg" onclick="window.open(this.href);return false;

regards
jon

stimpy · Post by **stimpy** » Sat Dec 13, 2008 9:40 pm

ez outs the way to go,hopefully its not cross threaded in there
stimpy

Threads in plug hole are gone!

Threads in plug hole are gone!

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