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Old 03-27-2020, 04:11 PM
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Default What do you do about this?

Aluminum is turning yellow and corroding on the engine even though it is just sitting. Do I just polish it?
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Old 03-27-2020, 04:26 PM
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Looks like oil to me unless you clear-coated or aluminum paint on the heads and the coating started to burn off. Aluminum dulls and the forms white aluminum oxide on the surface.

Spray it with aluminum wheel cleaner and lightly scuff with a green scotchbrite. Rinse with clear water in a spray bottle and wipe dry. The apply a liberal coating of WD40 on all the aluminum parts and retreat periodically.

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Old 03-27-2020, 05:35 PM
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Looks like oil to me also. Therefore I'd start with just a shop or terry towel soaked in brake clean, lacquer thinner, or acetone and see if it doesn't lift off. These won't change the surface texture and more aggressive attacks will.

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Old 03-27-2020, 05:53 PM
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Unprotected aluminum corrodes quickly. Once you have clean the oil off, apply metal prep( a phosphoric acid solution) then apply Alodine to stop future corrosion.

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Old 03-27-2020, 05:55 PM
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Looks to me like iron laced dust rustin!

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Old 03-27-2020, 07:44 PM
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Quote:
Originally Posted by hurryinhoosier62 View Post
Unprotected aluminum corrodes quickly. Once you have clean the oil off, apply metal prep( a phosphoric acid solution) then apply Alodine to stop future corrosion.
Any idea what Alodine would do the the appearance of the aluminum? I'm assuming it would change the finish.

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Old 03-27-2020, 08:48 PM
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It’s not oil. The engine hasn’t been run in months it’s not oil.

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Old 03-27-2020, 08:55 PM
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Quote:
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It’s not oil. The engine hasn’t been run in months it’s not oil.
It's rust. The heads are blasted with metal during the manufacturing process. Sometimes specs of metal are embedded in the aluminum and then rusts.

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Old 03-27-2020, 09:44 PM
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Quote:
Originally Posted by PAUL K View Post
It's rust. The heads are blasted with metal during the manufacturing process. Sometimes specs of metal are embedded in the aluminum and then rusts.
So what do I do? My machinist said a scotchbrite pad no cleaner

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Old 03-27-2020, 09:54 PM
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Quote:
Originally Posted by PAUL K View Post
It's rust. The heads are blasted with metal during the manufacturing process. Sometimes specs of metal are embedded in the aluminum and then rusts.
Correct, the only way I have been able to keep it from happening was to use a scotchbrite pad with CLR on it.

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Old 03-27-2020, 10:13 PM
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I've never had much of a problem but seemed to have luck with brake clean and a silver wire brush.

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Old 03-27-2020, 11:50 PM
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Quote:
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So what do I do? My machinist said a scotchbrite pad no cleaner
Have you tried what he suggested?

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Old 03-28-2020, 12:06 AM
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Can’t go out. Waiting on scotchbrite from amazon LOL

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Old 03-28-2020, 12:28 AM
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I assume you could use Iron Out.
Or Sodium Hydrosulfite powder if you have access to it.

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Old 03-28-2020, 12:29 AM
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Can’t go out. Waiting on scotchbrite from amazon LOL
Get a loaf of bread too while at Walmart!

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Old 03-28-2020, 01:14 AM
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Quote:
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Get a loaf of bread too while at Walmart!
I have two loaves of bread and two gallons of milk. I just ordered some scotchbrite pads and wd40 from Amazon. I also have 48 rolls of TP not because I am a hoarder but because I am on the Amazon subscribe and save program and we weren’t here much last month so we got that month and this months LOL

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Old 03-28-2020, 07:10 AM
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Quote:
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It's rust. The heads are blasted with metal during the manufacturing process. Sometimes specs of metal are embedded in the aluminum and then rusts.
Paul is right, it is embedded rust. Had the same thing happen on my rpm intake and it keep getting worst as time went on. Never could find anything that would clean it up, so i just used high temp aluminum engine paint and sprayed entire intake. It turned out great, looks new again.

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Old 03-28-2020, 11:52 AM
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X2 paint it. Had this problem with my intake years ago and painted it engine color. Did the same on this engine-intake and heads. Paint stays on aluminum heads shockingly well

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Old 03-28-2020, 06:40 PM
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Hit it with a small brass bristle brush

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Old 03-31-2020, 09:46 AM
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Quote:
Originally Posted by OCMDGTO View Post
X2 paint it. Had this problem with my intake years ago and painted it engine color. Did the same on this engine-intake and heads. Paint stays on aluminum heads shockingly well
x3. The Dupli-Color 1615 Aluminum Engine Paint is the right 'tone', not real shiny or anything, and looks great. Easy to touch up too.

I usually etch intakes, but it's tough to do the same on heads. Wipe it with acetone, let it dry, and shoot them.


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