Which of the following statements is LEAST-Likely true?
A) Scuffing on only one skirt is rarely caused by excessive idling.
B) Four-corner scuffing occurs when both skirts are scuffed on the edges next to the piston pin.
C) A piston that overheats because of cooling system problems or abnormal combustion will expand excessively near the piston pin.
D) Scuffing on both skirts is usually caused by insufficient clearance between new pistons and remachined cylinder walls.

Question

Quizplus · Accepted Answer

Scuffing on only one skirt being rarely caused by excessive idling is the least likely true statement. Excessive idling typically does not generate the conditions necessary to cause scuffing on piston skirts, as it does not usually lead to the extreme conditions of heat and friction that cause scuffing. Scuffing is more commonly associated with issues like insufficient lubrication, excessive piston-to-cylinder clearance, or abnormal operating conditions that lead to overheating.

Which of the Following Statements Is LEAST-Likely True