Exam Question
With reference to stuffing box of a two stroke main engine explain following:
(a) Why stuffing box is required in two stroke diesel engines. (8)
(b) Explain the maintenance carried out on stuffing box during piston overhaul. (8)
Class 4 (4th Engineer)
MEP
📅 Mar 2026
Reference Answer
### (a) Why Stuffing Box is Required in Two-Stroke Diesel Engines (8 Marks)
The stuffing box is a critical component in large, slow-speed, two-stroke crosshead diesel engines. It is housed in the diaphragm plate, which provides a physical separation between the crankcase and the scavenge space. The stuffing box itself forms a dynamic gas-tight and oil-tight seal around the piston rod as it reciprocates. Its primary functions are as follows:
1. **Sealing Between Scavenge Space and Crankcase**:
* The fundamental purpose is to create a reliable, dynamic seal between the high-pressure scavenge air space below the piston and the atmospheric, oil-filled crankcase.
The stuffing box is a critical component in large, slow-speed, two-stroke crosshead diesel engines. It is housed in the diaphragm plate, which provides a physical separation between the crankcase and the scavenge space. The stuffing box itself forms a dynamic gas-tight and oil-tight seal around the piston rod as it reciprocates. Its primary functions are as follows:
1. **Sealing Between Scavenge Space and Crankcase**:
* The fundamental purpose is to create a reliable, dynamic seal between the high-pressure scavenge air space below the piston and the atmospheric, oil-filled crankcase.
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