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.
(b) List the causes leading to sudden loss of lubricating oil pressure in the engine.
Class 4 (4th Engineer)
MEKM
📅 Dec 2024
Reference Answer
### (a) Lubricating Oil Conveyance in a Large Bore Slow Speed Engine
Lubricating oil in a large two-stroke crosshead engine is circulated by a pressure-fed system. The oil serves to lubricate moving parts, reduce friction, remove heat, and carry away wear particles. The oil is drawn from the main engine sump tank by positive displacement pumps (typically screw or gear type), passed through coolers and filters, and then delivered to a main distribution manifold or rail running along the engine bedplate.
From this main rail, the oil is conveyed to the various bearings as follows:
**1. Main Bearings:**
Lubricating oil in a large two-stroke crosshead engine is circulated by a pressure-fed system. The oil serves to lubricate moving parts, reduce friction, remove heat, and carry away wear particles. The oil is drawn from the main engine sump tank by positive displacement pumps (typically screw or gear type), passed through coolers and filters, and then delivered to a main distribution manifold or rail running along the engine bedplate.
From this main rail, the oil is conveyed to the various bearings as follows:
**1. Main Bearings:**
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