Helicoil for clutch slave studs: use JBWeld epoxy ?

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Durango2k
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#1 Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Durango2k » Tue May 09, 2017 4:28 pm

Hi,

Today my helicoil 3/8-16 arrived from the US. I wonder wether I should use JBWeld with the insert, to give it even more strength ? I mean the stud is there to stay forever, I see no need to ever remove it again ?

Carsten
Jag E '66 S1 2+2, 74’Citroen DS 23 Pallas iE, 73’ Citroen SM 3.0, 75’ Concept Centaur MK1, 54’ Citroen 11 BL, 71‘ Velosolex, 88‘ Unimog U1650

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Mark Gordon
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#2 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Mark Gordon » Tue May 09, 2017 6:24 pm

I can't think of a reason as to why you would need the JBWeld, Carsten, unless you're a belts and suspenders type of guy. A properly sized and installed Helicoil will hold just fine and you do then have the option of removing the stud as if it were in an undamaged bell housing. I recently had to remove my clutch slave cylinder and the only way I could get it out with the engine installed in the car was to completely remove the bottom stud and hydraulic pipe and then rotate the cylinder so that I could access the top nut from down below.
Mark

67 OTS 1E14988, 2015 Camry XSE

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Series1 Stu
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#3 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Series1 Stu » Tue May 09, 2017 9:53 pm

Hi Carsten

When you fit the helicoil, dab a little barium chromate paste on it first. It's the white stuff that is often used on alloy wheel seats and for protecting the shaft drive on BMW motorcycles. Don't use too much and fit the studs pretty soon afterwards.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Nearing completion
'69 Daimler 420 Sovereign
'78 Land Rover Series 3 109

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Series1 Stu
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#4 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Series1 Stu » Tue May 09, 2017 9:56 pm

The paste is to reduce the risk of galvanic corrosion between the dissimilar metals, meaning you stand more chance of dismantling the stud at a later date should the need arise.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Nearing completion
'69 Daimler 420 Sovereign
'78 Land Rover Series 3 109

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abowie
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#5 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by abowie » Tue May 09, 2017 11:20 pm

No.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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#6 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Hugo » Wed May 10, 2017 8:22 pm

You had to go all the way to the US for a 3/8" UNC helicoil? JB Weld will serve no purpose in such an application. Out of interest, 3/8 x 16 is also the pitch of a Whitworth thread - the pitch is the same but the shape of the thread is slightly different. Almost all Whitworth threads are the same pitch as UNC. Sometimes you can get away with a cheat, but not if it's anything important.
Hugo Miller - rebuilding an imported Series II OTS & converting to RHD

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Durango2k
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#7 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Durango2k » Wed May 10, 2017 9:55 pm

... it was the cheapest way, put it that simple. The same Stanley kit including cutter and tool and 10 coils was 16.99 USD or 35 Euros hereover, so guess what I did.

I am not in a hurry.

Non-Metric stuff is expensive here, I bought all my special E tools in the UK for example.

Carsten
Jag E '66 S1 2+2, 74’Citroen DS 23 Pallas iE, 73’ Citroen SM 3.0, 75’ Concept Centaur MK1, 54’ Citroen 11 BL, 71‘ Velosolex, 88‘ Unimog U1650

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caveman
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#8 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by caveman » Sun May 21, 2017 6:53 am

Hi Carsten,

I helicoiled my Clutch Slave Cylinder (only one stud) over 10 years ago and without any fixing agent and it's still going strong.
Steve
1965 S1 4.2 FHC (early)

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Moeregaard
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#9 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Moeregaard » Sun May 21, 2017 2:34 pm

Helicoils are a permanent solution and I've never had one fail. They're approved for use on aircraft, usually used to repair stripped spark-plug threads, so they have the blessings of our Federal Aviation Administration--not an easy process. On my first FHC, the banjo bolts for the camshaft oil feeds had stripped and a pair of Helicoils saved the day. Here in the US, we have another thread-saving product known as a Timesert. Installation is a little more involved, but they seem to work better than Helicoils when the thread length is very short.
Mark (Moe) Shipley
Former owner '66FHC, #1E32208
Former owner '65FHC, #1E30036

Planning on getting E-Type No. 3 as soon as possible....

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Durango2k
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#10 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Durango2k » Thu May 25, 2017 9:25 pm

Tonight I finally came around setting the Helicoil.

It is darn tight down there. Would it have been the upper stud it would have been engine out.

I could just set the threadformer, then use a 7 mm spanner on it, and press it in the hole with my finger, turning it using the spanner. Forth and back it went, until it finally went inside nicely. Wheeeew. Deep breeze.

Then as tricky setting the helicoil, because of the length of the setting tool. Had to use a grip on it. Then punched the tab of, and installed the stud through the clutch slave hole- I could not justify emptying it again.

In the end, problem solved, I learned a lot about helicoil, and will probably buy a set for regular use.

Carsten

P.S.- I used no glue nor loctite. Just the coil. Works.
Jag E '66 S1 2+2, 74’Citroen DS 23 Pallas iE, 73’ Citroen SM 3.0, 75’ Concept Centaur MK1, 54’ Citroen 11 BL, 71‘ Velosolex, 88‘ Unimog U1650

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1970jagdriver
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#11 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by 1970jagdriver » Fri Jun 16, 2017 9:17 pm

I hope you have the correct tap for the helicoil

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Mark Gordon
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#12 Re: Helicoil for clutch slave studs: use JBWeld epoxy ?

Post by Mark Gordon » Fri Jun 16, 2017 10:13 pm

Helicoil kits come with a bunch of inserts, the correct sized tap and an insertion tool.
Mark

67 OTS 1E14988, 2015 Camry XSE

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