cleaning aluminium engine parts

[LSpec]

My car has this horrible stains in the engine




How I can remove them safe? I saw this thread with good information but I think the use of acid with a lot of plastic parts near is not the best choice, or what you think?.

Aluminum Wheel Restoration.

I dont want to be one week with a wire brush trying to remove the stains besides of the small areas hard to reach.

[inDetail]

That's some serious damage. Looks like the header. I have a beater so I never mess with it. Heck my beater is my product test and practicing car. Your probably looking at some serious cutting with a aluminum polish and a lot of time. BF makes aluminum polish. That is not gonna be fixed in a weekend and machine work. 90% of engines that have a cover on them the block and headers under them are just unfinished metal. The plastic cover is much cheaper make and install then it is to polish metal to make it look good.
If your mechanically auto inclined and can be without the car I would take it off and bring it to get cleaned up and powder coated.Then throw some Hi-Temp wax on it before you reinstall it. Otherwise That is going to be hours and hours of work. If I detail an engine that is in good shape they usually have a plastic cover over the block. I will take the cover off the block wipe the black down with APC wipe it down with a damp towel. I detail the engine and put a coat of hi-temp wax on it before I put the cover back on. My only concern is to keep the damage from getting worse and keep it protected.
I always detail my personal engines twice a year. Spring then fall. Up keep is everything.

[LSpec]

That's some serious damage. Looks like the header. I have a beater so I never mess with it. Heck my beater is my product test and practicing car. Your probably looking at some serious cutting with a aluminum polish and a lot of time. BF makes aluminum polish. That is not gonna be fixed in a weekend and machine work. 90% of engines that have a cover on them the block and headers under them are just unfinished metal. The plastic cover is much cheaper make and install then it is to polish metal to make it look good.
If your mechanically auto inclined and can be without the car I would take it off and bring it to get cleaned up and powder coated.Then throw some Hi-Temp wax on it before you reinstall it. Otherwise That is going to be hours and hours of work. If I detail an engine that is in good shape they usually have a plastic cover over the block. I will take the cover off the block wipe the black down with APC wipe it down with a damp towel. I detail the engine and put a coat of hi-temp wax on it before I put the cover back on. My only concern is to keep the damage from getting worse and keep it protected.
I always detail my personal engines twice a year. Spring then fall. Up keep is everything.

The part in picture is the intake manifold from a 6A12 engine



Is not really damaged, I know because in some parts I clean with a dish sponge, the green one and removes, but I dont want to do all that work

thank you

[Vegas Transplant]

Acid will leave its own fingerprints behind on your end results. I believe that I see rust and pitting in the photo. I could be mistaken. Cast al. is a rough surface...add in the pits and I doubt that you will achieve perfection.

[Durallymax]

x2, with it being cast Aluminum it will always collect stuff and let it settle out making it look bad. Unless you removed it, sanded and polished it to make the surface very smooth, you will be fighting a loosing battle.

Acid will just make it white, if thats what you want then you could try it, I would suggest using a sponge or something to apply it so it does not contact things you do not want it to touch.

[BillE]

Try some APC and a stiff brush.

Not saying that is what you are looking for, but I too have a boatload of cast aluminum 'stuff' on my engine and this work well for me to keep it looking good.

Oh, I do use CD2 Engine Detailer to try and keep it looking good.

Bill

[LSpec]

I tried with APC, and it cleans the aluminium but do not remove the stains, even if I use a wire brush. I guess I will paint it.

[Durallymax]

Ypu could always remove it and polish it if you want

[andrew8729]

Purple power full strength, stiff brush, and power washer should do the trick

[LSpec]

Ypu could always remove it and polish it if you want

the problem, is that all engine parts look the same, cover valve, gear box, intake manifold..

Purple power full strength, stiff brush, and power washer should do the trick

I will try. thank you.