Cost of getting Helicoils fitted?

[kartman24]

I have a Fiat 126 engine that needs four Helicoils fitting in to the exhuast elbow threads, any idea what an enginnering firm would charge as a rough guide?.......Martin

[//j17]

No idea what a machine shop would charge but they aren't complicated to fit and it's a job most people tackle them selves.

Some kits come with everything you need, some oddly don't include the drill that you have to buy separately. fitting is the same though.

1) Use specified over-sized drill in hole. This removes the old, damaged threads.
2) Use the supplied tap to cut a new, over-sized thread.
3) Use included tool to wind thread insert in to over-sized thread.
4) Use included tool to snap off insertion tang.

[Carsie]

Just had two done on my son's scooter; exhaust manifold/head - cost £85. Thought it was a bit steep to be honest.

[Huntsman]

'Recoil' Kits in a little red tin on ebay are fine, easy to do.

Be careful, if the holes are blind the tap is an intermediate so you might find not enough thread is cut for the coil.

[kartman24]

Many thanks, the holes are blind £85 for two sounds like a rip off to me, i would be better off getting another used head at that price. Will check out the recoil on ebay..........Martin

[Huntsman]

kartman24 said:

Many thanks, the holes are blind £85 for two sounds like a rip off to me, i would be better off getting another used head at that price. Will check out the recoil on ebay..........Martin

I'm guessing these studs are M8?

Generally speaking you'd want 1.5D (ie 1.5*the diamter) long helicoils, look carefully at the taps on offer to see if you've got the depth you need.

[//j17]

Also take a look and see if the bolts actually bottom out!

As a general engineering principle, even in a blind hole the bolt shouldn't bottom out but should have free space/threads at the bottom of the hole. There are other reasons but if the bolt bottoms-out the force between the threads is just holding the bolt in the threaded piece - the thing you are trying to bolt to it could still be loose!

[BSA 500]

Try ....http://www.uni-thread.com/
Complete kit(5/16 whitworth,tools,drill and tap £28)