Exam Question
(a) What are the different types of crankshaft used in marine diesel engines? (10)
(b) Discuss the various factors affecting the failures of crankshafts in marine diesel engines. (6)
Class 4 (4th Engineer)
MEKM
📅 Mar 2025
Reference Answer
### (a) Different Types of Crankshafts in Marine Diesel Engines (10 Marks)
Crankshafts in marine diesel engines are classified based on their method of construction, which is determined by engine size, speed, and power output. The primary types are as follows:
#### 1. Fully Built Crankshafts
* **Construction:** This method involves manufacturing all components—main journals, crankpins, and crankwebs—as separate pieces. The components are then assembled using a shrink-fitting process.
Crankshafts in marine diesel engines are classified based on their method of construction, which is determined by engine size, speed, and power output. The primary types are as follows:
#### 1. Fully Built Crankshafts
* **Construction:** This method involves manufacturing all components—main journals, crankpins, and crankwebs—as separate pieces. The components are then assembled using a shrink-fitting process.
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