1999 Porsche Boxster

[Roth]

I heard a popping noise while running and it was front drivers side spark plug. Removed coil packs and spark plugs with exception of cylinder in question. Coil pack was damaged along with spark plug laying in tube bore. Was not threaded into engine. Replace spark plug tubes because the cylinder in question the tube was cracked, confirmed spark plug hole stripped! ****E! Ran tap down hole with minimal results. (went right through hole) Very hard to access! Ordered a Heli coil sleeve kit to attempt repair. Any thoughts on techniques to accomplish this task without issues? I already prayed to baby JESUS and my spark plug hole was stripped! Probably/almost positively due to a mechanic before I got car over tightening spark plug and partially stopping hole at that time. 

[JFP in PA]

14 minutes ago, Roth said:

I heard a popping noise while running and it was front drivers side spark plug. Removed coil packs and spark plugs with exception of cylinder in question. Coil pack was damaged along with spark plug laying in tube bore. Was not threaded into engine. Replace spark plug tubes because the cylinder in question the tube was cracked, confirmed spark plug hole stripped! ****E! Ran tap down hole with minimal results. (went right through hole) Very hard to access! Ordered a Heli coil sleeve kit to attempt repair. Any thoughts on techniques to accomplish this task without issues? I already prayed to baby JESUS and my spark plug hole was stripped! Probably/almost positively due to a mechanic before I got car over tightening spark plug and partially stopping hole at that time. 

 

Sorry, but trying to install a repair device with the head still on the engine is very tricky to nearly impossible.  You will be generating a lot of metal filings that simply cannot be allowed to drop into the cylinder bore or they will destroy the cylinder liner. I would not even attempt it in my shop.  Your best and safest bet is to pull the head and take it to a machine shop where it can be done properly and safely. Good luck.

[Roth]

Ive heard of moving the piston close to TDC for that cylinder and packing hole full of grease or vasoline to catch fillings and then after repair vacuum with specially made vacuum tube: the grease and debris. Ive also heard of starting engine with that cylinder still without spark plug and coil pack: to force out any fine debris left over with engine pressure. Ive also heard that the fine aluminum fillings will burn up without consequence but Im not buying the last possibility! Thanks for help.

[JFP in PA]

6 minutes ago, Roth said:

Ive heard of moving the piston close to TDC for that cylinder and packing hole full of grease or vasoline to catch fillings and then after repair vacuum with specially made vacuum tube: the grease and debris. Ive also heard of starting engine with that cylinder still without spark plug and coil pack: to force out any fine debris left over with engine pressure. Ive also heard that the fine aluminum fillings will burn up without consequence but Im not buying the last possibility! Thanks for help.

 

All of those are band aids to trying to escape the obvious: There are many wrong ways to attempt this, and one correct one.  In the end, it is your car and your money.....