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[longlast]

 
 Anyone  know what can be done about a fix to this dilemma.

The plug felt tight so i  gave it some WD40 took my time removing it.  I had put copper anti seize on the plug when i installed it like i do each time i change the plugs. Don't know why this time it ripped the threads.

Anyway,  can this be fixed.  Im starting to pull the head now.

[Joel]

I use Time-Serts, a solid thread insert,    I put grease on the thread cutter to collect the majority of the aluminum as it c8ts the oversized hole, never had a return do to the insert coming back out.
The option with the head removed is similar but more like a rivet style that is pressed into the head.

[longlast]

I use Time-Serts, a solid thread insert,    I put grease on the thread cutter to collect the majority of the aluminum as it c8ts the oversized hole, never had a return do to the insert coming back out.
The option with the head removed is similar but more like a rivet style that is pressed into the head.

Cheers  Joel,
What size drill bit do you use before you use the thread tap?

[Finster101]

The steel inserts should be available as a kit that will have the proper reamer instead of a drill bit.  It will also have the correct tap and an install tool.  I have done many Northstar engine blocks with this method.

[Joel]

Correct just google [ time-sert thread repair kit ]  and it will bring up options. I thought I posted a picture of the kit but obviously I didn't.

[Aussie]

I have repaired a few Spark Plug threads using a similar kit as in the picture, no drilling required as the tap has the original thread size then steps up to the coil size to help guide the tap square in the old plug hole.

[Aussie]

This may be some help to you.

[Finster101]

I don't like that first kit as well as the second one with the solid inserts.  The time-serts are a solid piece of steel as opposed to a coil.  I used them to repair head bolt holes that had stripped out of aluminum blocks.  They are quite strong and much more reliable for something like a sparkplug hole where the plugs will be removed and reinstalled.

[Aussie]

I don't like that first kit as well as the second one with the solid inserts.  The time-serts are a solid piece of steel as opposed to a coil.  I used them to repair head bolt holes that had stripped out of aluminum blocks.  They are quite strong and much more reliable for something like a sparkplug hole where the plugs will be removed and reinstalled.

I haven't done a repair for many years but will use Time-serts next time around. They seem to be a cleaner and more robust repair. Thanks for sharing.

[longlast]

Thanks for all the info. 

This is a first for me. I've pulled wrenches all my life and this is my first plug hole repair I've ever had to do. So im a greenhorn at this.

The Time Sert Kit looks like the way forward but at 200 + a kit  for one hole and never use kit again  i can't justify the cost.

Alternative, 

I contacted Alex he overhauls Harley-davidson heads and he's going to help me out. I've already removed the head and I'll take it to him in the next day or two.
BTW. Alex uses Time Sert on his repairs.

I'll post a photo outcome.

[acevtwin]

Heli Coil should do it.

[longlast]

Heli Coil should do it.

No, i did check into that route.  With  Heli Coil you have to cut away to much material. The H C wall is .097"   the T S  insert wall is .061" .
Overall cut on a .462" plug hole with H C is .575" thats a lot of material on a plug hole cut away
 With the T S  Overall cut is .512"  plus the TS is a 1.25 thead

There's not a lot between the plug hole and the valves to play with.

[johnsachs]

Heli Coil should do it.

I wouldn't use a Heli Coil to fix a spark plug stripped thread.
John
I use SEAL-LOCK, Self tapping spark plug thread repair system.
Seal-Lock international
Box 625
Dresher, Pa. 19025

[HD Street Performance]

https://www.amazon.com/Self-Tapping-Spark-Thread-Repair-Threads/dp/B00XLWHDRW

[longlast]

 Thanks to Alex at FastLane Head Works for harley-davidsons he installed a Time Sert plug hole insert for me.
I'm all set to go now for putting the motor back together. Alex also threw in a new Cometic head gasket.