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How to change helicoils?

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Pantera Mike View Drop Down
International Auto Mag
International Auto Mag


Joined: 20 Jan 2018
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pantera Mike Quote  Post ReplyReply Direct Link To This Post Topic: How to change helicoils?
    Posted: 13 Aug 2018 at 11:52pm
All,

My cocking piece helicoils need to be changed. Bruce Stark was kind enough to gift me a pair of replacements, and I have a friend who is a brilliant machinist who has the necessary tools to install them. But we have questions:

1). How are the old helicoils removed without destroying the cocking piece in the process?

2) How are the new helicoils retained? Blue Loktite or ?

Tips from those who have been there/done that much appreciated!
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jw4570 View Drop Down
Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jw4570 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 1:26am
There are two types of helicoils.  Tang where you put it in and break off the tang and then there is tangless.

Read this catalog and it's very informational:

http://helicoil.in/pdf/helicoil%20catalogue.pdf


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Pantera Mike View Drop Down
International Auto Mag
International Auto Mag


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pantera Mike Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 7:06am
Wow that’s a great resource! Thanks!

There are far more than just two different types. The important distinction for us is ‘locking’ Vs ‘non-locking’.   I don’t know what the Auto Mag originally came with, but intuitively I would assume the locking style would be superior for our application. They are distinguishable by their red color. The ones in my cocking piece are silver which may explain why the recoil rods keep coming loose.

Apparently the part number of the locking kind of the appropriate length is

3591 3CN380

where the 380 indicates the length of .380 inches, which works out to 2X the diameter. They have 9 1/2 coils. They are available in quantities of 100 from various sources but I was able to get a pack of 25 on EBay, genuine Heli Coil brand, for $6.99 (some Auto Mag parts dealers charge $18.50 each!)

It turns out there is a dedicated Heli Coil removal tool as well. It’s a simple-looking thing that costs almost $40! There’s a cheap Chinese version on EBay for $10 that I will give a try first....
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Pantera Mike View Drop Down
International Auto Mag
International Auto Mag


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pantera Mike Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2018 at 2:56am
I finally got around to changing my helicoils today. It was a non-trivial exercise. I can see why professionals charge a fair amount for this service. There was a lot of trial and error, and helicoils that failed to go in properly. 

Most vendors sell them in bags, but the source I used on eBay sold them installed on a plastic strip which is BRILLIANT!  Initially I was removing them and trying to install them, which went quite poorly. Eventually I realized the strip is actually an alignment tool, and after that things went much more smoothly:




Subsequent test-firing showed the recoil rods no longer shooting loose, so it was well worth the effort!

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Pantera Mike View Drop Down
International Auto Mag
International Auto Mag


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pantera Mike Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2018 at 4:44am
bump to move this ahead of the Chinese spammer posts!
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USA 1776 View Drop Down
Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote USA 1776 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2018 at 4:21am
Mike, whats a "Chinese spammer post" ?? I've seen nothing here matching that description.
'It has been said that politics is the second oldest profession. I have learned that it bears a striking resemblance to the first.' Ronald Reagan
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Pantera Mike View Drop Down
International Auto Mag
International Auto Mag


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pantera Mike Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2018 at 4:31am
some jerk from China joined the forum, then started creating one new topic after another after another, with both the post title and the extensive text in the post being in Chinese characters. Dozens of them.  They were appearing in every sub forum. I ‘bumped’ the most recent legit topics to get them in front of the spam topics. I contacted Ian via email who was on vacation and hadn’t seen what was going on. He reacted right away, banning the guy, and deleting all his posts. So if yo weren’t paying close attention to the forum the drama came and went before you knew it....
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USA 1776 View Drop Down
Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote USA 1776 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2018 at 4:54am
Must be what happened. I'm on every night, sometimes very late, but just once a day.

Well, thank you and, as always, Ian, for the prompt action!!
'It has been said that politics is the second oldest profession. I have learned that it bears a striking resemblance to the first.' Ronald Reagan
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richie_b View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote richie_b Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2018 at 3:00pm
Mike, did you Loc-Tite your new Heli-Coils in place???

Did you take pics of the removal with the tool???
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TRX302 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRX302 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2018 at 3:26pm
> plastic strip

All the ones I bought came in little plastic boxes or blister packs. But I'll look for the strips next time I buy some!
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