Header studs, lock tight or not?

[fotoguzzi]

New header studs, Norge 1200.. should I use lock tight? What’s the best method to tighten them up so the nuts come off not the studs coming out? Use anti seize for the nuts?

[jrt]

I think the heat would negate the use of locktite, but I'll admit there are many more varieties than I am aware of (I know of purple, blue, red and green for sleeves).  I'd use a nickel based never sieze. 

[PeteS]

I think the heat would negate the use of locktite, but I'll admit there are many more varieties than I am aware of (I know of purple, blue, red and green for sleeves).  I'd use a nickel based never sieze.

This ^^^^^^
I have never had them loosen, only seize.
You can tighten them with the double nut trick.

Pete

[DirtFarmer]

High temp anti-seize.     

[guzzisteve]

22ftlbs ea service, no loctite.

[kballowe]

I think the heat would negate the use of locktite, but I'll admit there are many more varieties than I am aware of (I know of purple, blue, red and green for sleeves).  I'd use a nickel based never seize.

I agree

22ftlbs ea service, no loctite.

^^^ this ^^^

[fotoguzzi]

got it, thanks.

[SIR REAL ED]

the heat makes Loctite ineffective.  I always replace the nuts and/or studs with stainless steel and use nickel based (due to the color, of course) anti-seize.

[fotoguzzi]

Umm, stainless steel in that application not the best idea, ask Pete Roper or Lucky Phil.

[guzzisteve]

Must be getting close to the 1st voyage on your Norge?

[Wayne Orwig]

Anti-seize.
And Loctite is a waste of time with the heat.
I once saw someone use nylock nut on them. 

I often use stainless steel for less critical applications with low torque (valve covers, etc.) and I have great results. But SS there is questionable. If it snapped, you are in for some serious problems getting it out. My V85 exhaust stub nuts were a rusted mess. I did replace those with SS nuts with anti-seize.

[n3303j]

Loctite 243 Blue Medium Strength Threadlocker, 360 Degree F Maximum Temperature

That's well above the temperature the crankcase operates at. The Loctite will retain the studs and seal the threads.

As far as anti seize on the head nut end be sure and compensate on the torque applied. Published figures seem to state that torque should be reduced 20 to 25 percent if the fasteners are coated with anti seize compound versus regular oil. Anti seize is a great high pressure lubricant. I believe Guzzi specifies torque figures for lightly oiled fasteners.

[Moparnut72]

Anti seize for me. If you are worried about the nut coming undone instead of double nutting use a Palnut. They only need a couple of threads. We used them in the aircraft shop on the nuts that held the cylinders on.
kk