Engine Rebuild, Electrolatic Corrosion?

[steve000]

Hi all.

Im currently rebuilding an Engine. I am also slightly detailing it. I am wandering, The Exhaust manifold Nuts and studs had become very rusted and where a real pian to remove. I am wandering Will i get problems with accelerated corrision if i use Stainless Steel Studs and nuts/or stinless studs and copper nuts, When Fixed into a Cast Steel Engine block?

If so, Is there any way of preventing this?

Thanks

Steve

 

[icrman]

I have used stainless steel studs, bolts, nuts many times in that sort of application. But not copper no strength in them. Just make sure you use a stainless that won't rust. As some species do.

 

[MikeHalloran]

Stainless will work nicely, and still be separable, if you coat all the male threads with Never-Seez before assembly. Be a little generous with it, and wipe off the excess after assembly. Never assemble stainless fasteners without it, not even just for a trial fit. It's also effective on regular carbon steel, and will mitigate rust if you coat the exposed portions with it. Great for rat rods.

Copper nuts are only used on copper studs, for electrical connections.

Brass nuts, heavy hex pattern, on steel studs, are sort of an old- time traditional solution for moderately high temperatures. Steel nuts with Never-Seez are stronger, cheaper, more durable, and just as easy to remove.

Never use cadmium or zinc plated fasteners in high temperature service. They quickly crack and fall off.



Mike Halloran
Pembroke Pines, FL, USA