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How to install a Heil-Coil

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.
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The Heli-coil kit being used is a 8 x1.25mm
The drill bit needed is 21/64

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Install the drill bit into the drill motor, and drill the hole out.
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Blow out the hole with compressed air
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Next take the heli-coil tap
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Tap the hole to its oversize.
*NOTE* Heli-Coil taps are an odd size.

On aluminum use a cutting fluid.
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Keep the tap straight and square to the work piece.
Blow the hole out again
Now put the insert on the install tool
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Now carefully screw the insert into the threads that were just cut, being careful not to apply too much force and skip a thread.

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make sure to counter sink the top of the heli coil by a thread or two

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Once the insert is in properly, snap the bottom tab off and blow it out of the hole.
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All done and ready to have the part bolted back!
 
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