stripped thread on No 3 plug hole

[stevez1]

Hi, Feeling like a right pillock just now. In a moment of distraction, I seem to have stripped the thread on No.3 plug hole. Just seems to be the first couple of turns but the plug won't align and screw in. Don't want to force it and make it worse. Has any one got any suggestions for an easy fix or is it a head off job?
Yours frustratedly
Steve

[Hinckley]

If you've got a friendly garage near you they may have a thread chaser you can borrow, these push the thread back into shape without removing much material.

You can buy them but they are not cheap cheap.

My local machine shop fitted Time Serts in my Z900 A4 head as they were too far gone, they cost a wallet wrenching £25 each to be done! Head off job though.

Good luck.

[jimmock]

I would think anything that creates swarf dropping down in the combustion chamber would mean a head off??

Number 2 and 3 are not the easiest to get to in situ.

[hillbilly]

put piston to top,then lay some cotton in on top of piston.that should catch and hold ant bits of ali.

[andyb1962]

I assume you mean from exhaust outlet or how else do you get the cotton in and out ?

[warren3200gt]

You need to stop any crud ending up in the cylinder. Chasing or re-cutting the thread or cutting then helicoiling will create swarf.
The only safe way to do it is taking the head off.

[hillbilly]

one cotton ball pushed down plug hole so it sits under were the shite will go,cotton is a good grabber of fine stuff,it goes in it,and will still be there when pulled out.

[z1bman]

there is no need to remove the head to do a heli coil if you have the correct tools & it only takes 15 minutes. see post below

http://www.z1ownersclub.co.uk/forum/vie ... sc&start=0

[kas750]

Personally I wouldn't give it a 2nd thought worrying about doing it in situ..

[big green bus]

I have used a timecert (I think that is what they are called) just covered the tap in grease and used an airline had no problems

[kev edwards]

If you just want to chase the thread, a little thing my pops showed me years ago was to file a slot up across the threads of an old plug, then do as hillbilly says, screw the old plug in carefully and this will chase the threads, he was an army fitter and sometimes things had to be done in the field, failing that timesert

[KeithZ1R]

if all you want to do is chase the thread

https://www.machinemart.co.uk/shop/prod ... -040210261

[ZedHead]

if all you want to do is chase the thread

https://www.machinemart.co.uk/shop/prod ... -040210261

Now that is a handy piece of kit

[PAULJAC47]

If you just want to chase the thread, a little thing my pops showed me years ago was to file a slot up across the threads of an old plug, then do as hillbilly says, screw the old plug in carefully and this will chase the threads, he was an army fitter and sometimes things had to be done in the field, failing that timesert

Yep i have used that method with some success,also used a stepped 14mm tap that come with a Helicoil set,took the head off with that though...

[Z1parR]

I use one of these Sealey reverse thread chasers , it's a decent bit of kit and no bits drop in .