There's a bunch of this stuff on the flanges of my turbo manifold and I would like to know the best way to remove as much of it as I can. I took a welding wire brush to it but I can't get in the runners. What do you guys suggest? I'm thinking this stuff is a danger to a turbo, isn't it?

Note: the entire manifold isn't cast iron, just the head and turbo flanges.

 

Sandblaster

 

Another way to do it is hold your manifold with the flange down, and tap the sides of the flange all around with a hammer (really loose stuff will fall right out), then rake a screwdriver around the edges to get anything else off that's really loose. They make small wire brushes like toothbrushes, which you'll find at your welding supplier - you can use that to finish clean. If it doesn't come off with the hammer and screwdriver, it isn't going to come off with normal engine vibration.

I believe they also make barrel-type wire brushes that will go on the end of your die grinder also, but a wire brush won't take off any but the loosest scale - it will just polish over it. So I would not use a wire brush for your main cleaning method in this type of situation.

Whatever you do, blow it out really well with air afterward or you'll have created more of a problem than you've solved, especially if you use a sandblaster on the inside of your manifold.

 

Sweet, thanks guys.

 

http://www.evaporust.com/

it works great after you degrease and get the big chunks off

 

A solution of muratic acid and water will get the rust off . Just let it soak for a few hours. But it will almost instantly flash rust if u do not apply something to protect it.