182 spat out a Spark Plug :/

[Chapperz]

and chewed a HT lead to boot.....

Hey guys

I'm going with the assumption that the plug has worked lose and popped out causing all of this. Before throwing a new plug and HT lead on I'm guessing i should be checking the cylinder for debris? Couple of pics below and any advice what i need to look out for and how to go about it much appreciated.

 

[Louis]

Surely if there was anything there it would have already done the damage as it wouldn't stall straight away?

 

[Chapperz]

No it didnt stall - limped for about 5 mins doing my best tractor impression (both speed and noise) to get it home

 

[Louis]

So any debris that was in there will have been thrown around the engine already and done damage no? Just drain the oil and screw another spark plug in

 

[Chapperz]

So an Oil change is needed?

 

[Louis]

That's where I'd start and put in a magnetic plug. Sure you'll get more advice from someone in the know

 

[Eddie555]

Seen this before on a mates 172.
1, his pulled about 8 threads out of the cylinder head.
2. It happened on track so came straight into the pits.
3. The threads were still attached to the spark plug.
4. We looked down the piston bore and fortunately due to it just being a short trip back into the pit nothing had gone back into cylinder.
5. Helicoiled the cylinder head fitted new plug and it was ok.

Looking briefly at your plug it looks like I can see a bit of cast still on the thread of your plug. About 5-6 threads up. What may have happened could have been similar as in pulled the last few threads out of your head.
1, have you checked to see if all your threads are intact in the head.
2, if it’s pulled then I’d say due to you continued driving for 5 mins the plug would have shed all the bits of pulled threads back down into the cylinder.
3, I’d try and get hold of a boroscope and drop that piston right down and have a look inside.

 

[Chapperz]

Cheers @Eddie555 - will do that first thing in the morn (1 and 3)

 

[Chapperz]

Well it`s stripped the threads - cant even get a new plug tight

Helicoil time for me

 

[R3k1355]

Yep common problem with ali heads, some dickhead previously will have massively over-tightened the spark plugs when installing them and fucked all the threads up.

Whip all the plugs out, see if anymore are damaged.
Then you'll need to think about helicoiling the plug holes or just getting a new cylinder head that isn't already damaged.

 

[Chapperz]

@R3k1355 I will have to hold my hand up to being that dick head - Owned her 11 years and I dont let anyone else touch her

Are all Helicoil sets similar in quality or is there a recommended brand to go for?

 

[Darryl_1983]

I've had this happen once before on a 182, didn't cause any damage to the engine at all. But as you say it ran on 3 cylinders and sounded like a tractor. I assumed it was a lead popping off as i'd also had this once before on the same car.

In the end i bought a helicoil type repair kit for a spark plug thread, and a new plug and some heat proof thread lock for the new insert. Took about 10 minutes to sort and the car ran perfectly afterwards.

It's probably done another 20k+ miles since and still running well.

 

[Darryl_1983]

Just looked on eBay, and i think this is the kit i bought. It was at least identical in what was provided anyway:

25 Pcs Car Spark Plug M14*1.25 Tap Screw Thread Tools Repair Kit With Case for sale online | eBay

Find many great new & used options and get the best deals for 25 Pcs Car Spark Plug M14*1.25 Tap Screw Thread Tools Repair Kit With Case at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

 

[R3k1355]

Looks a decent set that

@R3k1355 I will have to hold my hand up to being that dick head - Owned her 11 years and I dont let anyone else touch her

Lol oh well, live and learn. (and buy a torque wrench)

 

[JamesBryan]

Yep common problem with ali heads, some dickhead previously will have massively over-tightened the spark plugs when installing them and fucked all the threads up.

Whip all the plugs out, see if anymore are damaged.
Then you'll need to think about helicoiling the plug holes or just getting a new cylinder head that isn't already damaged.

Or not tight enough, can happen either way.

 

[Chapperz]

Just looked on eBay, and i think this is the kit i bought. It was at least identical in what was provided anyway:

25 Pcs Car Spark Plug M14*1.25 Tap Screw Thread Tools Repair Kit With Case for sale online | eBay

Find many great new & used options and get the best deals for 25 Pcs Car Spark Plug M14*1.25 Tap Screw Thread Tools Repair Kit With Case at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

Cheers man - ordered and will set to once arrived

Thanks for your help all - will post back to say if shes survived or not...

 

[Darryl_1983]

Cheers man - ordered and will set to once arrived

Thanks for your help all - will post back to say if shes survived or not...

No worries mate. I don't think you need the loctite. But i bought some to be on the safe side to apply to the outside of the thread insert. Think it was rated at 200 degree C from memory.

Just had a thought though, you might want to double check the thread size for the Clio plugs. I think M14 x 1.25 is correct

 

[JamesBryan]

If you do loctite the insert in, make sure it has gone off before you put the spark plug back in.

 

[Chapperz]

Quick update - all seems to be sorted

Bought an expensive kit of amazon and the bloody insert instalation tool was to short. But the kit @Darryl_1983 recommended and it worked fine ?

Not been out for a blast yet but she's is idling fine so ???

As always cheers for the help amigos

 

[R3k1355]

You used a brand new spark plug right?? Cos they're longlife so won't need changing for a number of years (aka till the car belongs to someone else)

 

[RichValver]

Quick update - all seems to be sorted

Bought an expensive kit of amazon and the bloody insert instalation tool was to short. But the kit @Darryl_1983 recommended and it worked fine ?

Not been out for a blast yet but she's is idling fine so ???

As always cheers for the help amigos

Glad iv found this thread, just had a plug pop out on my 172, checked plug and doesn't seem to have much thread collected on it. Tried fitting a fresh plug and it feels as though it's about to strip whatever threads are left. Il order the same helicoil that you have purchased. My question is, how do you go cleaning out the cylinder of any debris after helicoiling?

Any help appreciated

Looks like plug took a bit of a tap too

 

[RichValver]

Iv gone for this kit as the link posted no longer works. Hopefully it will do the job https://www.ebay.co.uk/itm/392896208903

 

[Chapperz]

Iv gone for this kit as the link posted no longer works. Hopefully it will do the job https://www.ebay.co.uk/itm/392896208903

Yeah that looks like it`ll do it mate.

I hoovered the hole, then disconnected the fuel rail and turned the engine over (without the spark plug in) which fired more out, hoovered again and then just fired her up. Never had an issue, hope you don't either

 

[Krarl]

Duct tape some small hose to the nozzle of the hoover, you should get into the cylinder with it and get any swarf out

Thank me later, hose on a hoover has served me well with loads of different s**t

 

[Ol’ Tarby]

hose on a hoover has served me well

I bet it has

 

[Krarl]

I bet it has

You told me about it!!😂

 

[jameswrx]

Also, could you put thick grease on the flutes of the Tap? Might catch some of the swarf.

 

[Clio_fool]

Also, could you put thick grease on the flutes of the Tap? Might catch some of the swarf.

No, it'll melt and drip into the cylinder and then you can't hoover it out. Go in dry it'll be fine.

 

[RichValver]

Duct tape some small hose to the nozzle of the hoover, you should get into the cylinder with it and get any swarf out

Thank me later, hose on a hoover has served me well with loads of different s**t

This is exactly what I'm thinking! Thanks for all the tips. Just waiting on the kit to arrive now

 

[RichValver]

Iv also ordered an inspection camera too so I can check for any leftover debris 👌🏼

 

[MyChemical172]

Sorry for bumping but I'm having the same issue..
Plug number 3 blew out and you can even see on pictures that thread is damaged..

I'm a novice here and not sure what to do, will this fancy thing help? https://www.amazon.co.uk/dp/B0086306NO/?tag=cliospnet01-21

how far in does it need inserted?
Also will it be enough to hoover the debris and change the oil after the job, car only did 500 when the plug blew out..

Many thanks to whoever replies

 

[Krarl]

I repaired mine

Post in thread 'Monaco 172 Track Car' https://www.cliosport.net/threads/monaco-172-track-car.817060/post-12080199

 

[MyChemical172]

I repaired mine

Post in thread 'Monaco 172 Track Car' https://www.cliosport.net/threads/monaco-172-track-car.817060/post-12080199

Omg thank you! Nice thread that one, I really enjoyed it.
So which set did you use exactly? Just anything with a m12 and m14 in it?
Did you grease before the job, or after to pick up the swarf that remained?
As someone in another post suggested to do it on dry, I've never done anything like it so don't know.
Many thanks

 

[Krarl]

Omg thank you! Nice thread that one, I really enjoyed it.
So which set did you use exactly? Just anything with a m12 and m14 in it?
Did you grease before the job, or after to pick up the swarf that remained?
As someone in another post suggested to do it on dry, I've never done anything like it so don't know.
Many thanks

The kit I bought comes with an M12-M14 step tap, there was 1.5 threads left in my head luckily. It just helps to centre and plumb up the thread so you don't cut new ones in on a weird angle. I added fresh grease on each tool with each full turn making sure to back it off every so often

Then I washed it all down with brake clean, dumped a slight amount into the cylinder and then thoroughly hoovered it all out making sure there was nothing else. The grease caught most of the metal swarf, I wouldn't advise doing it dry