Class 2 (2nd Engineer) MEKM 📅 Mar 2025

Exam Question

Evaluate the influence of the following factors upon cylinder and piston ring wear rates. (16)

(a) Position of rings in relation to piston crown,

(b) Spread and proximity of coolant passages from liner wall

(d) Chromium plating of ring faces

Reference Answer

(a) Position of Rings in Relation to Piston Crown
If the top land is too much (ring positioned farther from the piston crown) :
The top ring remains cooler, reducing thermal stress.
A larger gap facilitates carbon accumulation between the piston crown and liner. This causes abrasive wear and disrupts the lubrication film, leading to excessive liner wear.

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