Exhaust collar thread lube?

[MikeG]

What do I want to use on my exhaust collar threads? Never Seez? Permatex copper hi heat? Nothing? Leaning towards Never Seez but opinions/experiences are always welcome.
Thanks

 

[comnoz]

If the nuts are a snug fit in the threads then antisieze will keep them from siezing.

But if the nuts are a loose fit [normal] them RTV will help keep them from unscrewing. Jim

 

[Hobot]

Regular silvery anti-seize has worked for us for decades but it does tend to melt and drip out so I've switched to Milk of Magnesia which was told to me by a BI rider that worked on industrial ovens so I looked it up to see its long proven.
I use put on two layers letting dry a good bit to build up a decent powerdry light pink layer. MoM is considered a hi temp anti seize.

 

[Nortiboy]

What do I want to use on my exhaust collar threads? Never Seez? Permatex copper hi heat? Nothing? Leaning towards Never Seez

I use a nickel never seize. Tighten nuts like a spark plug with a short bar when very hot. Never come loose, but threads are excellent.

 

[Saber13]

MoM, you go to be sh*ting me.

I could not resist

 

[DogT]

I used nickel anti-seize, but yeah, it dripped out all over my headers when I started it up. hobot may be right, don't discount it too soon.

Dave
69S

 

[Biscuit]

Regular silvery anti-seize has worked for us for decades but it does tend to melt and drip out so I've switched to Milk of Magnesia which was told to me by a BI rider that worked on industrial ovens so I looked it up to see its long proven.
I use put on two layers letting dry a good bit to build up a decent powerdry light pink layer. MoM is considered a hi temp anti seize.

Good for record runs! :roll:

 

[Hobot]

Good one Biscuit but the MoM is used to stop the runs of Mexican 2 step and other anti-seizes drools which is like tar, one drip out of place and its soon all over the place. I only grabbed the candied MoM photo for its colors but the plain stuff is the right stuff. Here's the details if ya can believe a Harley site report on another 'hard to swallow' hobot factoid.

Milk of Magnesia as a high temp anti-sieze.
Milk of Magnesia is Magnesium Hydroxide. It dries to a white powder and effective as an anti sieze in extreme heat applications, several hundred hours at 1200F.

Milk of Magnesia is used in the Air Force on jet engines. It is on the recommended products list for the installation of the igniter plugs in the main burner and afterburner sections of the General Electric J79, F101, F110 etc turbojet engines.

Engine Shop Manual chapter 72-55-05 paragraph 2B specificaly calls for Milk of Magnesia item #C02-061.

C02-061 is listed here in the consumable products list for GE's Commercial Engine Standard Practices Manual on page 11:
http://atcspro.com/Tradewinds/GE%20S...02-015-all.pdf

From the above linked document:
Must use the unflavored version of Milk of Magnesia to prevent sugar contamination.

 

[sidreilley]

Does it matter if the nuts are bronze instead of steel ?

 

[Hobot]

Steel don't expand as much as bronze which matters to keep threads locked up better from beating threads to death. Bronze golden looks better to me than the steel which matters to me. When I have to remove cold dead engine headers, ugh, i put a torch on the head area before I get out the hammer and scickle wrench. i'm taking a chance with Peel by Aluminum header ring nuts I know I can't beat on-off like tougher metal so MoM better work as advertised and light springs countering the loosing of fairly light torque I'll knock em on with. A few oz's here and a few there ...