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Author Topic: Helicoils  (Read 775 times)

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Kevin Wood

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Helicoils
« on: 04 July 2016, 14:36:55 »

I have a couple of M6x1.0 female threads in the engine block of a generator that need repairing.
This seems a textbook helicoil application but I've never used one before. Any recommendations?
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Nick W

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Re: Helicoils
« Reply #1 on: 04 July 2016, 14:41:37 »

I've only done a couple, but it's basically tapping best practice: drill and tap the hole square to the surface. If that means doing the job in a machine(if you can) or making a drill/tap guide then do so.
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serek

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Re: Helicoils
« Reply #2 on: 04 July 2016, 14:57:53 »

Shackeng

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Re: Helicoils
« Reply #3 on: 04 July 2016, 16:27:59 »

Looks like an excellent kit Serek. :y
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Kevin Wood

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Re: Helicoils
« Reply #4 on: 04 July 2016, 16:40:26 »

Yes, I was wondering about the "noname" branded items. I'll avoid them, then. :y
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106pete

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Re: Helicoils
« Reply #5 on: 04 July 2016, 16:42:58 »

I use helicoil kits all the time, even a couple v-coils from eBay, never had a problem.
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baggedestate

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Re: Helicoils
« Reply #6 on: 04 July 2016, 17:43:04 »

i agree with serek ive got the wurth ones at work and they are top notch
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Entwood

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Andy H

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Re: Helicoils
« Reply #8 on: 04 July 2016, 19:41:11 »

There is an 'art' to installing spring inserts successfully.

The thread you cut in the parent metal needs to be near perfect because the spring insert will follow the threads you cut. When you screw the insert in you need to stop at just the right point and then gently wind it back again to get the spring bedded into the threads in the parent metal. Finally you need to snap the tang off cleanly without disturbing the spring and without leaving a stump sticking out to catch on the stud or bolt that you screw back in.

I have successfully used 'Recoil' kits to salvage threads in aluminium on my old motorbikes. I have paid a grease monkey to balls up a Helicoil in a brake caliper and then paid someone else to salvage it using a Wurth timesert.

The Wurth timesert is a more robust (and reassuringly expensive) solution. A spring insert is an elegant solution but won't work if the damage extends beyond the root of the existing thread. You can use Loctite to stop a timesert from working loose, you can't with a spring insert.

If you have the time a man of your calibre should have no problem with the spring inserts. (but if time is money and you need a guaranteed result then the Wurth timeserts don't look so expensive)
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Andy B

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Re: Helicoils
« Reply #9 on: 04 July 2016, 23:26:33 »

I have a couple of M6x1.0 female threads in the engine block of a generator that need repairing.
This seems a textbook helicoil application but I've never used one before. Any recommendations?

If you're not in a rush & can wait a couple of weeks till I get home from my holiday,   I'll lend you  the taps etc  for the timeserts that serek has linked to  ;) Helicoils are crap by comparison
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Kevin Wood

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Re: Helicoils
« Reply #10 on: 04 July 2016, 23:33:07 »

I have a couple of M6x1.0 female threads in the engine block of a generator that need repairing.
This seems a textbook helicoil application but I've never used one before. Any recommendations?

If you're not in a rush & can wait a couple of weeks till I get home from my holiday,   I'll lend you  the taps etc  for the timeserts that serek has linked to  ;) Helicoils are crap by comparison

Yep, there's no desperate rush and that would be very much appreciated. :y
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omegod

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Re: Helicoils
« Reply #11 on: 05 July 2016, 11:56:58 »

I bought a gorgeous but suspiciously cheap 7 series BMW a few years back , turned out it had popped a plug and had a terribly applied helicoil that also had come out. Local old school mechanic charged me 90 to fit a timesert and job was a goodun  :y . Would love someone to teach me how to use them
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tidla

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Re: Helicoils
« Reply #12 on: 05 July 2016, 23:28:22 »

Used them on a renault movano van to secure the cam caps down after the pistons moved them from there home.

Cannot remember the name but they was a branded kit in a dark blue box and did the job.
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