In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove<br>A:Ⅰ only<br>B:Ⅱ only<br>C:both Ⅰ and Ⅱ<br>D:neither Ⅰ nor Ⅱ

In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove
A:Ⅰ only
B:Ⅱ only
C:both Ⅰ and Ⅱ
D:neither Ⅰ nor Ⅱ

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