Exam Question
(a) What is function of Guide Shoe in a 2-Stroke Diesel engine? (4)
(b) Draw diagrammatic sketch of guide shoe, naming each part. (8)
(c) Describe how guide shoes are lubricated. (4)
Class 4 (4th Engineer)
MEKM
📅 Jun 2023
Reference Answer
### (a) Function of a Guide Shoe in a 2-Stroke Diesel Engine (4 Marks)
The primary function of the guide shoes in a large, two-stroke crosshead-type marine diesel engine is to absorb the transverse forces (side thrust) generated during operation and transmit them to the engine frame via the guide plates. This ensures the piston and piston rod assembly moves in a purely linear, vertical motion.
Key functions include:
1. **Absorption of Side Thrust:** The angularity of the connecting rod as the crankshaft rotates creates a significant horizontal force component. The guide shoes bear this thrust, preventing it from being transmitted to the piston and cylinder liner, which would cause excessive wear and potential seizure.
The primary function of the guide shoes in a large, two-stroke crosshead-type marine diesel engine is to absorb the transverse forces (side thrust) generated during operation and transmit them to the engine frame via the guide plates. This ensures the piston and piston rod assembly moves in a purely linear, vertical motion.
Key functions include:
1. **Absorption of Side Thrust:** The angularity of the connecting rod as the crankshaft rotates creates a significant horizontal force component. The guide shoes bear this thrust, preventing it from being transmitted to the piston and cylinder liner, which would cause excessive wear and potential seizure.
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