另外，GM表示新引擎将是“同级之中其中一款最宁静及最精细引擎”，因为新引擎采用一个静音进气歧管盖及倒齿式凸轮轴链条。

Gm also says the mill will be "one of the quietest and most refined engines in the segment" because of an acoustic intake manifold cover and inverted-tooth camshaft chains.

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拆去凸轮轴固定螺栓，并拆去作为一个总成的链轮和链条。

Remove the camshaft retaining bolt and remove the sprockets and chain as an assembly.

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链条驱动机构包括一条双排辊链，通过它来驱动进气和排气凸轮轴。

The chain drive consists of a duplex roller chain which drives both intake and exhaust camshafts.

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