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Q7. With respect to large two stroke crosshead main engines;

A. Sketch and describe a crosshead designed to prevent or minimize bearing edge loading.

B. State how the arrangement describe a achieves its purpose.

C. What would be an acceptable range of bearing clearance for the top end bearing and bottom end bearings of a large two-stroke marine diesel engine.

Q1. Sketch and show all parts of a two-stroke engine stuffing box. Describe the procedure of overhauling two stroke engine stuffing box, without removing piston. Answer should include all safety precautions and necessary tools used for stuffing box overhaul. (16)

- - - Previously Asked - - -

Sketch and show all parts of a two-stroke engine stuffing box. Describe the procedure of overhauling two stroke engine stuffing box, without removing piston. All safety precautions and proper tools used for overhaul to be mentioned. (16)

Q5. With reference to crankcase diaphragm glands: Explain why effectiveness deteriorates in service.

A. Describe the procedure for renewal of parts so that efficiency is restored. (6)

B. Describe how effectiveness is restored if spares are unavailable. (5)

C. Explain the functions of the upper and lower sections. (5)

Q8. Sketch a cross section through a piston rod stuffing box; A. Define with detail sketches the function of and difference between, sealing rings and scraper rings; B. Identify with reasons those details which should receive particular attention during overhaul of the complete assembly.

Q5.a) Sketch a commonly employed method of attachment between crosshead and slippers. (8)

b) Explain why guide clearance is strictly limited. (4)

c) Give reasons why lubricant is usually fed to the slippers and not the guides. (4)