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Which risk increases when extreme cylinder head temperatures soften aluminum pistons in an engine running lean?

A)Increased blow-by due to ring land collapse
B)Fuel injector failure from vapor lock
C)Crankshaft bearing wear from oil thinning
D)Valve float from thermal expansion

💡 Explanation

When extreme cylinder head temperatures soften the aluminum pistons, ring land collapse occurs because the aluminum loses strength and deforms under pressure, allowing combustion gases to leak past the rings. Therefore, increased blow-by results,rather than injector failure, bearing wear, or valve float which result from different thermal failure modes.

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