With reference to timing chains: A. Explain the causes of increasing chain slackness in service, using sketches to illustrate your answer; B. State: each of the following: i. The effects of increased chain length: ii. The method of assessing percentage increase in length: C. describe how the effects of elongation are corrected: D. State why a limit is placed on percentage chain elongation. State what measures you, as Second Engineer, would consider necessary after the correction procedure in Q.4(c) has been completed and the engine is running.

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