Q1. A. As second engineer describe the procedure involved in the complete inspection of a cylinder liner and piston assembly, indicating areas of significant interest.
B. Explain with reasons, possible faults which might be found;
C. Suggest how such faults might be avoided.
Q6. A completely new unit comprising piston, rings, liners, cylinder head and valves was fitted to a six-cylinder single-acting four-stroke diesel generator. Before installing the clearance and sizes were checked and considered satisfactory. During a trial run the running characteristics were abnormal so the generator was stopped. On examination, it was seen that the new piston had badly scored and drubbed the liner and had indication of seizure in the upper part of the liner. Give your reasoned comments for this failure.
Q3. State how each of the following practices affect piston ring life: (a) Nitriding of rings, (b) Chromium plating of ring grooves, (c) Contouring of rubbing faces, (d) Carbon or copper coating of rubbing faces.
Q4. Draw sectional diagram of the piston of 2-Stroke Diesel engine, marking each part. (8)
i) What is material of each part. (4)
ii) How many piston rings are in use, their type and material. (4)
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