Class 2 (2nd Engineer) MEKM 📅 Mar 2024

Exam Question

(a) Describe, with the aid of sketches, the procedure for cutting out and "hanging-up" an engine cylinder of a two-stroke crosshead engine in the event of complete failure of the crosshead pin such that the crosshead pin cannot be operated and no replacement is immediately available. (12)

(b) State, with reasons, the factors which may inhibit starting and limit the operating speed of the engine with 1 cylinder cut out. (4)

Reference Answer

(a) If the top end bearing is damaged, the engine must be modified to allow the vessel to limp to port. The primary action is removing the affected cylinder's connecting rod and suspending the piston, thus effectively isolating the seized unit. The following procedure is to be followed:
The lower half of the bottom end bearing is secured using a chain block to prevent it from falling into the crankcase during disassembly.
The hydraulic nut securing the lower half of the bottom end bearing is opened, and the bearing is carefully removed from the crankcase.
The connecting rod is then secured using a chain block.

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