Class 2 (2nd Engineer) MEKM 📅 Dec 2023

Exam Question

Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension. (16)

Reference Answer

Shown below is the arrangement of a chain drive, which is used to transmit power from the crankshaft to the camshaft.
It consists of chain sprockets mounted on the crankshaft & camshaft. There can be two or more chains.
A chain-tightening arrangement is provided, as shown in the fig.
The chain is guided by the guide bars, which has rubber shock-absorbing pads

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