Reciprocating Engine Overhaul Practice Test

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What consequence can occur if soap impregnates aluminum or magnesium surfaces after cleaning?

Reduced surface finish

Engine oil contamination and foaming

Soap residues left on aluminum or magnesium surfaces after cleaning can contaminate the engine oil and cause foaming. The soap acts as a detergent in the oil, emulsifying and trapping air. When the oil becomes foamy, it cannot form a stable lubricating film, reducing lubrication effectiveness and potentially causing oil pressure issues, increased wear, and overheating. Prevent this by thoroughly rinsing away cleaners and drying the surfaces completely before reassembly.

Increased corrosion

No effect

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