Class 2 (2nd Engineer) MEKM 📅 Feb 2024

Exam Question

(a) Sketch a cross section through a piston rod stuffing box. Define with detail sketches the function of and difference between sealing ring and scraper ring (10)

(b) Identify with reasons those details which should receive particular attention during overhaul of the complete assembly (6)

Reference Answer

(a) Cross-Section of a Piston Rod Stuffing Box and Functions of Rings:
The function of Stuffing Box:
The piston rod stuffing box is a component that prevents the mixing of the crankcase atmosphere with the scavenge space. It is bolted to the diaphragm plate, and the piston rod passes through this stuffing box. The stuffing box casing, often split vertically for ease of maintenance, contains multiple sets of scraper rings and sealing rings , each composed of three to four segments held together by garter springs.
Sealing Ring:

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