18mm heli coil kit

billycathey

New User
I have a spark plug hole that been
previously heli coiled. That insert came
out and I'm having the darndest time
finding 18mm heli coil kits. Any help and
guidance is greatly appreciated.
 
<a href="https://www.amazon.com/dp/B003WLWFG6/" target="_blank">TIME-SERT M18x1.5 Washer Seat Insert</a>

Not sure if it's the correct one for you.
Several issues, this one is 18 x 1.5 thread does that match you needs?

I tend to think so because Time-sert also sells a taper seat insert which suggests a spark plug sealing method and both types are then covered by the two types of inserts.

Then the length is .720 or 18.3mm tall. They offer another insert that is .400 or 10mm high which can be found in similar products on that same page.

No drill or tap included but they will be found in the .400 or 10mm high unit as combination deals, they can be purchased for the .720 tall one individually from the .400 or 10 mm high size page. In the comments for the shorter insert it is mentioned that the external thread will be 2mm larger than the internal thread. So 18mm + 2mm is a 20 x 1.5 mm tap to clean out the hole in the tractor head. I would use some high temperature loctite to prevent it coming out again.
 

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