Exam Question
(a) Draw sectional diagram of main engine piston showing each part. Show cooling passages for oil cooled piston (12)
(b) Name the different materials used for the various components of the piston as indicated to the answer above. (4)
Class 4 (4th Engineer)
MEKM
📅 Dec 2024
Reference Answer
### (a) Main Engine Piston: Sectional View and Cooling Passages
A modern two-stroke, slow-speed marine diesel engine piston is a built-up component designed to withstand extreme thermal and mechanical stresses. The diagram requested would show a cross-section of such a piston, revealing its internal construction and the intricate passages for cooling oil.
**Key Components to be Illustrated:**
1. **Piston Crown:** The uppermost part of the piston directly exposed to combustion temperatures and pressures. It houses the piston ring grooves.
A modern two-stroke, slow-speed marine diesel engine piston is a built-up component designed to withstand extreme thermal and mechanical stresses. The diagram requested would show a cross-section of such a piston, revealing its internal construction and the intricate passages for cooling oil.
**Key Components to be Illustrated:**
1. **Piston Crown:** The uppermost part of the piston directly exposed to combustion temperatures and pressures. It houses the piston ring grooves.
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