After cylinder boring or honing, what is the recommended method to clean the cylinder walls?

• A. Fresh engine oil
• B. A soap and water solution
• C. Solvent
• D. Gasoline

Answer: (B)

After boring or honing, the cylinder walls must be free of abrasive grit and any honing oil so the rings seat properly and the surface is true. A soap and water solution is the best method because it effectively lifts and rinses away grit without leaving hydrocarbon residues or flammable solvents behind. Fresh engine oil would contaminate the walls and obscure the true surface condition, while solvents or gasoline can leave residue, evaporate quickly, or pose fire hazards. After washing, rinse with clean water, dry the walls completely, inspect for scratches, and then apply a light coat of clean engine oil to prevent rust before final assembly.