Exam Question
(a) What are the Structural parts of 2-Stroke main Engine? (6)
(b) How are different structural parts held together? (4)
(c) What is the function of Cross Head Guides. (4)
Class 4 (4th Engineer)
MEKM
📅 May 2023
Reference Answer
### (a) Structural Parts of a 2-Stroke Main Engine (6 Marks)
The main structural parts of a large, slow-speed 2-stroke marine diesel engine are the stationary components that form its framework, providing rigidity and transmitting operational loads to the ship's structure. These are distinct from the running gear.
1. **Bedplate**: This is the foundation of the engine, fabricated from steel plates or cast. It is installed on the ship's tank top and secured by holding-down bolts.
* **Function**: Its primary functions are to support the crankshaft in its main bearings and to carry the weight of the entire engine. It must be extremely rigid to maintain the critical alignment of the crankshaft. It also acts as a sump for collecting crankcase lubricating oil.
The main structural parts of a large, slow-speed 2-stroke marine diesel engine are the stationary components that form its framework, providing rigidity and transmitting operational loads to the ship's structure. These are distinct from the running gear.
1. **Bedplate**: This is the foundation of the engine, fabricated from steel plates or cast. It is installed on the ship's tank top and secured by holding-down bolts.
* **Function**: Its primary functions are to support the crankshaft in its main bearings and to carry the weight of the entire engine. It must be extremely rigid to maintain the critical alignment of the crankshaft. It also acts as a sump for collecting crankcase lubricating oil.
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