case savers

[Augie]

I am looking for 12mm case savers. I see aircooled.net are out. Anyone have a source?

Thanks, Augie

[Sharp64]

Google search for "12 mm case savers" brought up a list of vendors.
_________________
1960 Indigo Blue Ragtop (Blue Barry)
1967 Ghia
1985 Westy Money Pit
“...some men aren't looking for anything logical, like money. They can't be bought, bullied, reasoned, or negotiated with. Some men just want to watch the world burn.” - Michael Caine

[Fenix]

[stanthedog]

Just curious, why doesn't anyone use helicoils. When I was in collage, instructor did a demo on them, you'd blow the case apart trying to get them to strip.

[Boolean]

Heli-Coils are great. But if you can use even bigger outer diameter, it'll be even stronger.
They are very nice for repairing or reinforcing any of the M8 threads on the case.
For head studs, I would go case saver to maximise strength.
*edit*
I used a lot of Heli-Coils when working with engines in the past. They are really good when used in the right place. The first knockoff brand I saw and tried were called Re-Coil, and they were actually just as good.
Nowadays there are all kinds of cheap copies of copies that people would call by the original name.
I recently bought a cheap kit just to try it out on a frying pan that needed a thread repair.
The coils are goodish but the taps are sketchy garbage. Probably named differently across the globe depending on market preferences.
You get what you pay for.
_________________
I strive for perfection. Excellence will not be tolerated!
Build thread here:
http://www.thesamba.com/vw/forum/viewtopic.php?t=529379

[modok]

The reason they strip out is not just a matter of strength, it's more a matter of expansion and contraction and fatigue. They say the most load is on the first thread. So, the first thread breaks, then the second thread is the first thread, and it breaks, and so on. A helicoil does not solve this as well as a time sert.
Time sert probably does make a VW case saver but it will cost more, and requires the expander tool.

[Boolean]

[modok]

Yeah, a heliciol is stronger than nothing, that's for sure. But they don't seal oil very well

[Boolean]

[raygreenwood]

Helicoils do have their place.....but not in cast aluminum or magnesium that is A. not hardened and B. Sees heat cycling.

Helicoils are nothing more than springs in reality. As load is appied in soft materials to the steel thread lands of the helicoil....if the host material deforms even the slighteat amount under load.....the helicoil expands with it ....side loading the thread lands.

At room temp you already get a few microns of defrormation of mag and aluminum. Adx heat expansion...and that side load grows. It will eventually shear the thread lands of the softer material.....meaning the case.

I only use helicoils in aluminum or mag...... A. When I am forced to and B. When its a large, non-heat cycling block of hardened metal.
Helicoils work very well in steel and cast iron.

Use an EZ-Lok solid wall insert or similar. The cost is no higher...and recently....most true value hardware stores have been carrying a decent range of EZ-lok brand solid wall inserts.

If you use a more coarse outer thread on the inserf...they will be stronger. Ray

[mark tucker]

springs!!! springs??? springs...realy ray springs.... I was in a pawn shop some 35 years ago..or more and they had this box of...heli coils there.no price. so we asked how much and they looked at the one in my brothers hand and said heck those tiny springs should be worth a penny a peace. so we bought a dollars worth. you I like tham springs but I dont see many places for them on the vw head stud issue.

[SBD]

[Fenix]

[raygreenwood]

[mark tucker]

settle down ray I wasent disagreeing with!! exzctly the opposite !!! as far as degrees /diplomas I have a few.... and also a BFH.

[SBD]

[raygreenwood]

[oprn]

Just curious here - in all the type 1 and 3 engines Dad and I rebuilt in the late '60s to the early '80s we never had to use a heli coil, case saver or had a pulled head stud. What were we doing wrong?

Granted, these were all basically stock engines. Is that the difference?

[ach60]

[raygreenwood]