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Old 01-08-2015, 06:30 AM   #1 (permalink)
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Talking How to install a Heli-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 heli-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 heil-coil tap
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Old 01-08-2015, 06:31 AM   #2 (permalink)
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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 heil 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!
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Old 01-08-2015, 09:42 AM   #3 (permalink)
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Thanks for sharing!

Do you have an opinion on Helicoil vs. using a Tap and Die set?
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Old 01-08-2015, 09:45 AM   #4 (permalink)
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Holy out of focus pics batman, but so useful. You should stop smearing the Vaseline on the lens for soft image flare. Or use better lighting, think of it like a porn shoot. Your words with good pics would make a manual out of your stickies.
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Old 01-08-2015, 09:46 AM   #5 (permalink)
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A tap is for making threads in a hole.

A Heli-coil is to replace the threads in a damaged hole.

Each have there place.
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Old 01-08-2015, 09:48 AM   #6 (permalink)
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Holy out of focus pics batman, but so useful. You should stop smearing the Vaseline on the lens for soft image flare. Or use better lighting, think of it like a porn shoot. Your words with good pics would make a manual out of your stickies.
Well I have gone thu several cameras at the shop, The first was a 4meg. As they were dropped or knocked over They have been replaced.

I also learned about the "Macro" setting. That is why the ones I wrote early on have the worst pics.
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Old 01-08-2015, 10:58 AM   #7 (permalink)
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Well I have gone thu several cameras at the shop, The first was a 4meg. As they were dropped or knocked over They have been replaced.

I also learned about the "Macro" setting. That is why the ones I wrote early on have the worst pics.

A lot the newer smart phones are the best little cameras to have.

My G3 takes great picts, I use it for documenting at the foundry I work at.
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Old 01-08-2015, 01:38 PM   #8 (permalink)
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Do u recommend going oversized with a tap/bolt when possible or helicoil? When I bought my spare block the assclown had stripped the timing belt tensioner bolt. Tried longer to no avail so I went larger with the tap. It's all to spec and holds just fine obviously but in your professional opinion what's the better route if welding and tapping isn't available at the time?
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Old 01-08-2015, 03:13 PM   #9 (permalink)
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These work okay sometimes, but I prefer Time-Serts.... similar idea, they just seem to last the test of time when done correctly.
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Old 01-08-2015, 04:03 PM   #10 (permalink)
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I think it all depends on the metal being inserted, its relative closeness to other things, and the pressure being exerted on the part. Stuff I think about before choosing a method, have used all with success once I learned to take my time. Coiled a spark plug on the side of a road, was dicey to blow out crap with piston and just hope, but the car ran for years after ward. Ah my red dodge neon....highline style. Thing was a piecer.
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Old 01-08-2015, 04:27 PM   #11 (permalink)
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Originally Posted by ek9_beast View Post
Do u recommend going oversized with a tap/bolt when possible or helicoil? When I bought my spare block the assclown had stripped the timing belt tensioner bolt. Tried longer to no avail so I went larger with the tap. It's all to spec and holds just fine obviously but in your professional opinion what's the better route if welding and tapping isn't available at the time?
If it works it works, some times the next size bolt will not work, so having the knowledge of a few methods is handy.

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These work okay sometimes, but I prefer Time-Serts.... similar idea, they just seem to last the test of time when done correctly.
I can see that if it is a bolt the is being run in and out often. The only time I really go for a time sert is spark plug holes, I just never like a spring coil in that position

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I think it all depends on the metal being inserted, its relative closeness to other things, and the pressure being exerted on the part. Stuff I think about before choosing a method, have used all with success once I learned to take my time. Coiled a spark plug on the side of a road, was dicey to blow out crap with piston and just hope.
That ^^^^^ It covers it pretty damn well, all I could say is some other odd repair on the side of the road.
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Old 01-09-2015, 12:22 AM   #12 (permalink)
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A tap is for making threads in a hole.

A Heli-coil is to replace the threads in a damaged hole.

Each have there place.
I mean tapping a damaged thread one size bigger and using a new bolt vs. helicoil
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Old 01-09-2015, 07:16 AM   #13 (permalink)
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The heli coil is a harder metal, usually due to aluminium heads and such, it can hold better in pressure situations where changing the bolt size won't work for many reasons, spark plugs, exhaust mani bolts etc. There is no real can and cant situations that don't involve looking at the application in question and measuring the pro and cons on site.

Off the top of my head, you have a weird size bolt, and in a bolt pattern that can be bad looking or time consuming have another wrench on had when servicing.

I wouldn't use a heli coil if the pressure on the bolt was across its head like hanging something from it.
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Old 01-09-2015, 07:56 AM   #14 (permalink)
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I'd like to see a video collection of these how-to's. Top notch subjects.
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Old 01-09-2015, 09:14 AM   #15 (permalink)
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Never been a fan of retapping and using a bigger bolt. You then have one oddball bolt which would bug the crap out of me
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Old 01-10-2015, 07:31 AM   #16 (permalink)
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I can agree that there are some times that each method would serve a "better" purpose... Its also very nice that DIY topics like this are posted..... very informative. Love it.
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