Exam Question
(a) Draw sectional diagram of main engine piston showing each part. (8)
(b) Show cooling passages for oil cooled piston. (8)
(c) What is material of crown and other parts of piston (8)
Class 4 (4th Engineer)
MEKM
📅 Nov 2023
Reference Answer
### (a) & (b) Sectional View and Cooling Passages of a Main Engine Piston
A modern, large two-stroke marine diesel engine piston is a composite structure, designed to withstand extreme thermal and mechanical loads. The construction and cooling arrangements are critical for its reliability and service life.
**1. Piston Components (as shown in the diagram):**
* **Piston Crown:** The top part of the piston exposed to combustion chamber pressures and temperatures. It houses the ring grooves.
A modern, large two-stroke marine diesel engine piston is a composite structure, designed to withstand extreme thermal and mechanical loads. The construction and cooling arrangements are critical for its reliability and service life.
**1. Piston Components (as shown in the diagram):**
* **Piston Crown:** The top part of the piston exposed to combustion chamber pressures and temperatures. It houses the ring grooves.
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