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Q4. Describe a procedure for cylinder liner calibration indicating how the readings are recorded to allow for easy recognition of liner wear. (16)

Q1. (a) Explain how can the cooling spaces within a cylinder jacket be examined without withdrawing the cylinder liner?

(b) To what parts of a cylinder jacket would give attention after removing an old cylinder liner prior to fitting a new one?

(c) What periodic attention must be given to the scavenge air space and piston-rod packing (Stuffing box) at the bottom of a cylinder liner?

Q8. Describe the process of replacing the cylinder liner in an auxiliary engine. How is water tightness ensured and what precautions are taken before commissioning the engine? (16)

Q4. Describe a procedure for cylinder liner calibration indicating how the readings are recorded to allow for easy recognition of liner wear. (16)

Q3. a) Describe 2 stroke Main Engine cylinder liner diameter measuring procedure. (8)

b) What is the modern system for liner Diameter Measurement? (4)

c) What are the advantages of modern system over old system? (4)

Q4. a) State the circumstances owing to which it may be necessary to renew a cylinder liner. (3)

b) Explain how the liner is removed (5)

c) Explain how the new liner is fitted. State the important checks to be made before and after fitting. (5)

d) How the liner wear rate is calculated. (3)

Q8. With reference to cylinder liner wear in large slow speed engine.

a) State THREE major factors associated with wear. (4)

b) Explain the procedure for correct ‘running in’ of piston rings and cylinder liners. (4)

c) Explain what is achieved by ‘running in’ process. (4)

d) Describe how cylinder lubrication limits wear. (4)

Q2. (a) Describe how cylinder liners are checked for wear (5)

(b) Explain how these measurements are recorded (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement (6)

Q3. (a) Draw a sectional diagram of cylinder liner of 2-stroke diesel engine, marking each part. What is the material of cylinder liner? (8)

(b) How cooling of liner is achieved satisfactorily (4)

(c) What is cleaning ring and where it is fitted? (4)

Q5. Sketch and describe a cylinder liner used for a 2-stroke main engine with cross flow scavenging. Show the provision made for sealing cooling water and exhaust gases. (16)