Technical spark plug thread gone and plug won't seat

[mikehopper]

Hi I've got an 8 valve 1.2 punto . There is a cylinder with a missing thread. As has blown the plug out and runs like crap.
What's best way to sort it. ? Cheers.

 

[jimboy]

You may be lucky & have it re-threaded, failing that you can go down the route of having an insert put in. Not really a job for your basic DIY'r. There are guides on the interweb, but I suspect you need to take it to a mechanic who has the knowledge & tools.

 

[varesecrazy]

Hi I've got an 8 valve 1.2 punto . There is a cylinder with a missing thread. As has blown the plug out and runs like crap.
What's best way to sort it. ? Cheers.

Hi, ideally it's a head-off job,

as tapping the hole to accept the insert..can lead to lots of metal debris (swarf) getting into the bore.. NOT good news

if the motors dodgy.. why the thread is U/S..then doing the job carefully, with posting @10mm short of TDC and initially using an airline , and then cranking with plug out to blow away worst of swarf COULD work.., but as I say better with head on the bench

Charlie

 

[Ziggy122]

Really as said due to metal swarf
U need to get the head off for a helicoil or it to be fitted with an insert


Depending.on cost.... itd probably be cheaper to throw an engine in now