Exam Question
Explain how the following condition effect the power developed by a diesel engine:
(a) Broken piston rings. (4)
(b) Worn fuel pump plungers. (4)
(c) Fouled turbochargers. (4)
(d) Worn out liner. (4)
Class 4 (4th Engineer)
MEKM
📅 Sep 2024
Reference Answer
### (a) Broken Piston Rings
**Concept:** Piston rings are critical components that perform three primary functions: sealing the combustion chamber to maintain compression and contain combustion pressure, transferring heat from the piston to the cylinder liner, and controlling lubricating oil consumption. There are typically compression rings (top rings) and oil control rings.
**Effect on Power Developed:** Broken piston rings severely impair the engine's ability to develop full power primarily due to a significant loss of compression and subsequent blow-by.
**Mechanism:**
**Concept:** Piston rings are critical components that perform three primary functions: sealing the combustion chamber to maintain compression and contain combustion pressure, transferring heat from the piston to the cylinder liner, and controlling lubricating oil consumption. There are typically compression rings (top rings) and oil control rings.
**Effect on Power Developed:** Broken piston rings severely impair the engine's ability to develop full power primarily due to a significant loss of compression and subsequent blow-by.
**Mechanism:**
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