How to use a HELI Coil tool to repair a stripped thread.

[threedogs]

Hi all not sure if any of you are familiar with these thread repair tools.
Basically what Ill show is how to use it,,,, first I need to drill the thread out to a larger
hole,, the drill is provided,, Then tap a hole to suit the new thread,,,,then screw in the new thread
Ill do it bit by bit. These tools were very popular years ago with motor bikes
stripping the spark plug hole.
OK first is a view of the tool itself nothing to be scared of, its just
a drill, tap and a tool to insert the thread and the threads themselves
This is a permanent repair.
Forgot to mention, what Im repairing is two stripped holes on my
thermostat housing so I can return it to Mudski, the thread Ill repair
is 8mm x 1.25 some call it 8mm fine

[threedogs]

This shows only one hole has been drilled out to 8.3mm
now to tap

[threedogs]

Hole is tapped to except the heli coil

[threedogs]

Once tapped its time to use the heli coil tool and screw the helicoil in position.
You can adjust the depth but I didnt need to

[threedogs]

Sorry about the pics , all done now all you need do is break the tag off the heli coil
so the thread is straight through
Bolts are straight just pic makes it look a bit off.
Now I can post it back to Mudski LOL

[mudski]

Good write up....
John I dont want the housing mate. I have no need for it.

[threedogs]

Ok then it will become a "forum" spare if any one needs it down the road.

[Touses]

Handy DIY that 3D. Does the helicoil require a bit of thread locker, as a just in case, for vibration?

[mudnut]

Good write up, TD. I recommend using anti seize on the bolt or stud that goes into the helicoil, because if they seize they will destroy the helicoil and make it very hard to repair.

[threedogs]

Handy DIY that 3D. Does the helicoil require a bit of thread locker, as a just in case, for vibration?

I suppose you could but there was no mention of it in the instructions

[threedogs]

Good write up< TD. I recommend using anti seize on the bolt or stud that goes into the helicoil, because if the seize they will destroy the helicoil and make it very hard to repair.

Excellent Idea as you have two dis-similar metals your bound to get electrolysis.
Never seize would be perfect
http://www.ebay.com.au/itm/161848123047?_trksid=p2060353.m1438.l2648&ssPageName=STRK%3AMEBIDX%3AIT

[Cuppa]

Is this an unusual thermostat housing? Most I recall seeing just have plain holes with the bolts screwing into threaded holes in the surface the housing mates to.

[mudski]

Is this an unusual thermostat housing? Most I recall seeing just have plain holes with the bolts screwing into threaded holes in the surface the housing mates to.
Its off a ZD30 cuppa. it bolts up a real different way to how you would think.

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[the evil twin]

Handy DIY that 3D. Does the helicoil require a bit of thread locker, as a just in case, for vibration?

I always, well after it happened to me years ago when i didn't, I subsequently always put Loctite on the helicoil and anti-seize on the bolt.

Nothing is worse than trying to undo the bolt at a later date and realising the bloody helicoil is coming with it

[Nightjar]

Great invention, has probably saved many costly replacements.

[threedogs]

Great invention, has probably saved many costly replacements.

Somewhere,,, some one is sitting on a beach drinking a drink with an umbrella sticking out of it........lol

[threedogs]

Is this an unusual thermostat housing? Most I recall seeing just have plain holes with the bolts screwing into threaded holes in the surface the housing mates to.

The thermostat "housing" is part of the block say similar to a starter motor
The bolts go through the block and then screw onto the thermostat housing, LOL
Being dis-similar metals you're bound to get electrolysis and this is where the problem
begins, they bond together and thats that...lol

[threedogs]

I think loctite 243 would be the go from memory not sure of the heat rating though.
Here's a pic of the thread once removed from the bolt lol

[growler2058]

Somewhere,,, some one is sitting on a beach drinking a drink with an umbrella sticking out of it........lol

Me very soon :)

[threedogs]

Me very soon :)

Oh shite is it that time of year already ????

[Avo]

Me very soon :)
Poofta

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[Irish]

Helicoils are great, first used one to repair the timing belt tensioner pulley bolthole on my wifes Daish1tsu that some muppet had gorilla tightened to death.

[threedogs]

Helicoils are great, first used one to repair the timing belt tensioner pulley bolthole on my wifes Daish1tsu that some muppet had gorilla tightened to death.

Well I have a 5/16th and 8mm one here if you ever need it