Class 2 (2nd Engineer) MEKM 📅 Jan 2022

Exam Question

With reference to medium speed engine cylinder liners:

(a) Explain the cause and effect of polishig and glazing

(b) Describe, with the aid of sketches, an anti-polish ring and explain how it is fitted in the liner

Reference Answer

(a) Polishing or Glazing in Cylinder Liners:
Causes:
Polishing or glazing of cylinder liners in medium-speed engines primarily occurs due to the burning of residual fuel, which leaves unburnt carbon deposits around the topland of the piston. These abrasive carbon deposits remove the lubricating oil film, leading to increased wear. Additionally, as the liner surface becomes polished, it develops a glazed texture that prevents the lubricating oil from adhering properly, resulting in metal-to-metal contact and further abrasion.
Other causes include:

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play