Exam Question
Write Short notes on the following:
(a) Effect of worn out rings on oil consumption and blow (5)
(b) Cylinder liner wears (6)
(c) Thermal loading of piston. (5)
Class 4 (4th Engineer)
MEKM
📅 Jul 2024
Reference Answer
### (a) Effect of Worn Out Rings on Oil Consumption and Blow-by (5 Marks)
Piston rings are critical components designed to perform three primary functions: sealing the combustion chamber, transferring heat from the piston to the cylinder liner, and controlling the lubricating oil film on the liner surface. Wear and tear compromises these functions, leading to significant operational issues.
**1. Blow-by:**
* **Definition:** Blow-by is the leakage of high-pressure combustion gases from the combustion chamber, past the piston ring pack, and into the scavenge space (in 2-stroke engines) or the crankcase (in 4-stroke engines).
Piston rings are critical components designed to perform three primary functions: sealing the combustion chamber, transferring heat from the piston to the cylinder liner, and controlling the lubricating oil film on the liner surface. Wear and tear compromises these functions, leading to significant operational issues.
**1. Blow-by:**
* **Definition:** Blow-by is the leakage of high-pressure combustion gases from the combustion chamber, past the piston ring pack, and into the scavenge space (in 2-stroke engines) or the crankcase (in 4-stroke engines).
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