Class 4 (4th Engineer) MEKM 📅 Sep 2025

Exam Question

(a) Describe with suitable sketches, how lubricating oil is conveyed to top end, bottom end and main bearings in a large bore slow speed engine. (10)

(b) List the causes leading to sudden loss of lubricating oil pressure in the engine. (6)

Reference Answer

### (a) Lubricating Oil Conveyance in a Large Bore Slow Speed Engine (10 Marks)
Lubricating oil in a large bore, slow-speed, two-stroke marine diesel engine serves to lubricate moving parts, cool components, and clean the system by carrying away contaminants. The oil is conveyed from the sump to the main, bottom end, and top end bearings through a pressurized, closed-loop system.
#### 1. System Overview
The lubricating oil (L.O.) system commences at the engine sump, which is typically integrated into the vessel's double bottom. The main components and flow path are as follows:

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