Which risk increases in Diesel engines utilizing steel pistons with excessive top ring clearance?

💡 Explanation

When top ring clearance is excessive, increased blow-by occurs because combustion gases leak past the piston ring, removing the oil film, leading to increased friction and cylinder wall scuffing. Therefore, cylinder wall scuffing becomes a higher risk, rather than emissions, thermal shock, or valve float, which depend on different factors in the engine.

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