Which sequence is part of the recommended cleaning process for magnesium engine parts?

• A. Wash with a commercial solvent, decarbonize, and scrape or grit blast
• B. Soak in water, scrub with a stiff brush, rinse
• C. Buff with a cloth after washing
• D. Expose to high heat to dry

Answer: (A)

Cleaning magnesium engine parts requires removing both oils and stubborn carbon deposits, then preparing a clean, rough surface for coatings or sealants. The sequence that starts with a solvent wash removes oils and greases effectively. Following that with a decarbonizing step attacks carbon buildup that soap and water don’t reach, reducing hot spots and corrosion risk. Finally, scraping or grit blasting physically removes remaining deposits and creates a suitable surface texture for adhesion of primers or coatings. This combination addresses all contaminant types and leaves the part properly prepared for subsequent maintenance steps.

Other approaches fall short: soaking in water and light scrubbing often leaves oils and carbon behind and can risk corrosion on magnesium; scrubbing alone without decarbonizing isn’t enough for heavy deposits; buffing after washing doesn’t remove tough residues or prepare the surface for coating; exposing parts to high heat to dry can cause oxidation, warping, or other damage to magnesium.