Internal Intake Rust - Team Camaro Tech
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post #1 of 15 (permalink) Old Apr 22nd, 09, 06:14 AM Thread Starter
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Brian
 
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Internal Intake Rust

Hi Guys,

I am currently in the process of putting my 396 back together. I had a bunch of machine work done to the crank, rods, block, heads etc. I took the intake manifold out of storage to clean it up and it is pretty rusty. I want to get the insides /runners cleaned up but I am unsure what to do or use. I am hesitant to to soak it in any type of acid out of worries of tainting the internals. Any recommendations?

Thanks
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post #2 of 15 (permalink) Old Apr 22nd, 09, 06:57 AM
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Jon
 
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Re: Internal Intake Rust

Quote:
Originally Posted by Z10396 View Post
Hi Guys,

I am hesitant to to soak it in any type of acid out of worries of tainting the internals. Any recommendations?

Thanks
You can do like the people that restore old cast iron pans do. First they soak them in lye for a few days to remove carbon and oil (use a plastic container). Lye also removes most paints. Rinse well, then soak in a 50/50 mix of white vinegar and water for as long as it takes to remove the rust (usually a couple of days maximum) aided by a wire brush if the rust is stubborn. I do this on lots of metal parts, but keep lye and vinegar away from anything other than steel as Aluminum tends to disappear, so be warned. Google "cleaning cast iron" for more info.

Be sure to read the instructions on the container if you use lye. Always add lye to water, never add water to lye. Eye and skin protection won't hurt either as lye can burn you pretty badly if you mess up. Lye is available at most grocery and hardware stores, also at Lowes.

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post #3 of 15 (permalink) Old Apr 22nd, 09, 09:14 AM Thread Starter
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Re: Internal Intake Rust

Thanks Jon. I read to use straight vinegar. There was also a recommendation to add peroxide to speed up the process. What do you think?
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post #4 of 15 (permalink) Old Apr 22nd, 09, 01:05 PM
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Re: Internal Intake Rust

Straight vinegar will just eat the rust faster. Haven't tried Hydrogen Peroxide, I'm not in that much of a hurry. Besides, I'm too cheep.

John N.

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post #5 of 15 (permalink) Old Apr 22nd, 09, 02:59 PM
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Re: Internal Intake Rust

Let the machine shop hot tank it.

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post #6 of 15 (permalink) Old Apr 22nd, 09, 06:33 PM Thread Starter
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Re: Internal Intake Rust

I was there yesterday. He told me to dip it in acid.

Quote:
Originally Posted by speedfreek View Post
Let the machine shop hot tank it.
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post #7 of 15 (permalink) Old Apr 22nd, 09, 09:56 PM
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Re: Internal Intake Rust

Quote:
Let the machine shop hot tank it.
You should have asked them when they did the block heads etc...throw them a couple 6 packs.
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post #8 of 15 (permalink) Old Apr 23rd, 09, 06:04 AM Thread Starter
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Re: Internal Intake Rust

It is my understanding that hot tanking doesn't really remove rust well at all.

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Originally Posted by Steptoe View Post
You should have asked them when they did the block heads etc...throw them a couple 6 packs.
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post #9 of 15 (permalink) Old Apr 23rd, 09, 01:12 PM
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Re: Internal Intake Rust

The machine shop I have used for yrs..and it is a small 1 man business large workshop...its tanked for a couple days, a potent mix of chemicals, then put in a cabinet where it is steamed sprayed ...goes thru a big wash cycle...comes out as if freshly cast.
It is not caustic cause it also does Al parts...caustic eats Al out.
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post #10 of 15 (permalink) Old Apr 23rd, 09, 05:19 PM
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Re: Internal Intake Rust

Take it to a shop that has a steel shop machine and have it shot blasted.

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post #11 of 15 (permalink) Old Apr 23rd, 09, 06:15 PM Thread Starter
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Re: Internal Intake Rust

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Originally Posted by Rogers Performance View Post
Take it to a shop that has a steel shop machine and have it shot blasted.
I will definitely keep these recommendations in mind. Right now I am pickling the sucker! We will see what happens. It has been in the vinegar for 24 hrs and I haven't seen any results but I will give it time. I cleaned it with marine clean first so that it was not tainted with oil.
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post #12 of 15 (permalink) Old Apr 23rd, 09, 08:26 PM
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Re: Internal Intake Rust

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Originally Posted by Z10396 View Post
I was there yesterday. He told me to dip it in acid.
But then where do you dispose of the acid when you are done? That would be a fair amount of acid to have to mess with.
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post #13 of 15 (permalink) Old Apr 23rd, 09, 09:58 PM
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Re: Internal Intake Rust

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Originally Posted by lluciano77 View Post
But then where do you dispose of the acid when you are done?
Vinegar is 4-6% acetic acid and not a real threat to most systems, but is strong enough to do the job, even when diluted. I use it to clean exhaust manifolds and they end up looking nearly new.

John N.

The only reason someone would want insurance is if they want to pay someone elses bills or want someone else to pay their bills.

Today's Republicans are yesterday's Democrats, and today's Democrats are yesterday's Communists.
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post #14 of 15 (permalink) Old Apr 24th, 09, 03:47 PM Thread Starter
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Brian
 
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Re: Internal Intake Rust

Jon,

Its starting to work! I pulled it out of the "pickle barrel" this afternoon after work and the bottom has large spots of clean cast iron. I wire brushed a few other spots and clean cast showed through. I will pull out again tomorrow and brush it and maybe even pressure wash it and then dunk it back. I was also thinking about a pipe cleaner type busher to get in side with. I will keep you posted.
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post #15 of 15 (permalink) Old Apr 26th, 09, 11:29 AM Thread Starter
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Brian
 
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Re: Internal Intake Rust

Well, I just pulled it out of the vinegar and pressure washed it.

I am truly amazed. The thing is mostly fresh cast iron now.

I am going to soak it another day or two and take it out and pressure wash it one more time.

The inside is basically spotless now. Surprising after basically sitting outside for the past twenty years.
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