rethreading a spark plug cylinder

C

carnagelan

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Hi Guy,

Are there companies out there that can re thread a spark plug Cylinder.

MY 3rd spark plug does not go in all the way and you can see the threading is not 100 percent in the cylinder
 
Do you get Helicoil's here?
 
bwana said:
There you go then.

Re-tapping the thread might be an option depending on how badly it's damaged. If not...
Click to expand...
Being the spark plug thread, it's a little bit more involved, as the very last thing you want is shavings of any kind ending up in your cylinder.. bye bye engine, hello very expensive repair bill..

Best left to professionals, this specific job.. if it were anywhere else, I would go for it myself, no problem..
 
bwana said:
There you go then.

Re-tapping the thread might be an option depending on how badly it's damaged. If not...
Click to expand...

I would think retapping or at least trying to clean the thread up is a first option, from what I remember helicoil's change the diameter of the thread which is probably not an option for spark plugs.
 
WAslayer said:
Being the spark plug thread, it's a little bit more involved, as the very last thing you want is shavings of any kind ending up in your cylinder.. bye bye engine, hello very expensive repair bill..

Best left to professionals, this specific job.. if it were anywhere else, I would go for it myself, no problem..
Click to expand...
Turn the engine upside down should solve it
 
Neuk_ said:
I would think retapping or at least trying to clean the thread up is a first option, from what I remember helicoil's change the diameter of the thread which is probably not an option for spark plugs.
Click to expand...
They are fine for spark plugs, have used them in the past for this, whilst the cylinder head was being overhauled..

The helicoil will return to whichever thread you need, you just need to drill out and tap a new, larger hole and thread for the helicoil to screw into.. once in though, you would be back to the same sized hole and thread as before..
 
rh1 said:
Do you know where they are located, they have items on their catalogue I would not mind purchasing but the delivery fee would not make it feasible.
Click to expand...
Nevermind, their facebook page states they are in Pretoria.
 
WAslayer said:
They are fine for spark plugs, have used them in the past for this, whilst the cylinder head was being overhauled..

The helicoil will return to whichever thread you need, you just need to drill out and tap a new, larger hole and thread for the helicoil to screw into.. once in though, you would be back to the same sized hole and thread as before..
Click to expand...

Aah, so you drill the original hole larger and thread for a helicoil that will give you the same size hole/thread as the original spark plug, interesting.
 
Neuk_ said:
Aah, so you drill the original hole larger and thread for a helicoil that will give you the same size hole/thread as the original spark plug, interesting.
Click to expand...
Yep.. useful little things.. not suitable for every application though..
 
WAslayer said:
Yep.. useful little things.. not suitable for every application though..
Click to expand...

I remember looking at them along with threaded inserts years ago to sort a dodgy thread on our '66 VW Bus oil sump drain plate but we just cleaned up the thread and it was reasonably OK after that.
 
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