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Old 07-25-2016, 09:46 AM
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Default Cleaning Engine Cases

     

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How on Earth do people (I'm talking to you, Dogger!) get their engine cases so clean during restorations? I'm assuming it's a steam clean with maybe a solvent thrown in... Is this something common that I can pay a local machine shop to do?

-Tom
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Old 07-25-2016, 10:21 AM
cowboyona426's Avatar
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dogger has his media blasted, if you go back through his build threads he explains it a few times.
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Old 07-25-2016, 06:04 PM
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I just had an engine Hydro Blasted. Came up great.

Normally, I'd use SOS pads. Some people would use them with WD-40.
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Old 07-26-2016, 10:44 AM
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Tom,

Engine cases and carburetor bodies are a special case. These parts are
clear anodized so special care has to be used to prevent damage to the
anodization.

How I clean them depends on what kind of mess I have to start with.
if the cases are lightly stained with minimal corrosion, I strip them of
all bearings and seals, soak them in a warm solvent bath to remove
dirt and grease then put them in a ultrasonic parts washer with
Aluminum specific cleaner. This washing uses heat and a surfactant
that strips the surface clean and leaves the residue floating at the top
of the tank.

If the cases are a bigger mess than described above, or if any repairs
need to be performed (welding, filling), I start with the same solvent,
dry with compressed air, perform the repairs, media blast with glass
bead, clean with the ultrasonic parts washer then send the cases out
to be re-anodized. Both techniques yield cases and carb bodies that
look brand new.

I don't recommend media blasting alone. This results in the protective
anodization layer being removed. You will have a clean looking dull
finish, but after the first ride, the porous Aluminum will soak up every
ounce of dirt and mud leaving you with a bigger mess than what you
started with. Media blasting works great on un-anodized parts like the
cylinder, cylinder head, brake calipers, etc.
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