How to install a Heli-Coil
The subject is a Toyota 2ZZ engine block
The bolt holes were cracked and then were welded making the holes out of line. The heli-coil will make this a simple fix.
The tools needed will be a Drill motor, the proper sized drill bit for the heli-coil kit, the heil-coil tap, install tool, and the heli-coil insert.
The Heli-coil kit being used is a 8 x1.25mm
The drill bit needed is 21/64
Install the drill bit into the drill motor, and drill the hole out.
Blow out the hole with compressed air
Next take the heli-coil tap
Tap the hole to its oversize.
*NOTE* Heli-Coil taps are an odd size.
On aluminum use a cutting fluid.
Keep the tap straight and square to the work piece.
Blow the hole out again
Now put the insert on the install tool
Now carefully screw the insert into the threads that were just cut, being careful not to apply too much force and skip a thread.
make sure to counter sink the top of the heli coil by a thread or two
Once the insert is in properly, snap the bottom tab off and blow it out of the hole.
All done and ready to have the part bolted back!
The subject is a Toyota 2ZZ engine block
The bolt holes were cracked and then were welded making the holes out of line. The heli-coil will make this a simple fix.
The tools needed will be a Drill motor, the proper sized drill bit for the heli-coil kit, the heil-coil tap, install tool, and the heli-coil insert.
You must be logged in to view this image or video.
The Heli-coil kit being used is a 8 x1.25mm
The drill bit needed is 21/64
You must be logged in to view this image or video.
Install the drill bit into the drill motor, and drill the hole out.
You must be logged in to view this image or video.
Blow out the hole with compressed air
You must be logged in to view this image or video.
Next take the heli-coil tap
You must be logged in to view this image or video.
Tap the hole to its oversize.
*NOTE* Heli-Coil taps are an odd size.
On aluminum use a cutting fluid.
You must be logged in to view this image or video.
Keep the tap straight and square to the work piece.
Blow the hole out again
Now put the insert on the install tool
You must be logged in to view this image or video.
Now carefully screw the insert into the threads that were just cut, being careful not to apply too much force and skip a thread.
You must be logged in to view this image or video.
make sure to counter sink the top of the heli coil by a thread or two
You must be logged in to view this image or video.
Once the insert is in properly, snap the bottom tab off and blow it out of the hole.
You must be logged in to view this image or video.
All done and ready to have the part bolted back!
Last edited: