Class 2 (2nd Engineer) MEKM 📅 Jan 2018

Exam Question

During a routine crankcase inspection, a main engine top end bearing is found to be wiped and subsequent inspection shows that the pin is badly scored.

(a) Explain in detail the action, which should be taken to enable the engine to be safely operated so that the vessel may reach a port where effective repair facilities are available.

(b) State with reasons the factors, which influence the speed at which the engine may be safely operated

Reference Answer

(a) If the top end bearing is wiped and the pin is badly scored, 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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