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Q7.a) Explain the function of the crosshead guide shoe in a main engine. How is the crosshead guide shoe lubricated? (8)

b) Briefly discuss the maintenance carried out on guide shoe. How can improper maintenance affect the engine’s operation and lead to potential damage. (8)

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)

Q4. In a situation where the main engine control system suddenly fails, and it is not possible to rectify this immediately

A. Explain the action that a 2nd engineer should take. (8)

B. State the instruction that the 2nd engineer should issue in order to ensure the continued safe and effective operation of the engine. (8)

Q7. Recent experience has shown persistence damage occurring on seating faces of main engine exhaust valve, which is not confined to any particular unit; (a) State with reason the possible causes; (b) State the short-term action to be taken in order to minimize engine operational problem; (c) State with reason how future incident of this nature could be minimized

Q9. (a) Describe how it is determined whether a crankshaft was twisted during a major “smash up” in a main engine.

(b) Explain where twisting is most likely to occur.

(c) Specify with reasons the degree of twisting that might be accommodated without correction

(d) Explain briefly what adjustments and precautions should be instituted when putting an engine with a twisted crankshaft back into service.

Q8. What is a “Cam"? Explain its function. With reference to its application in diesel engines

Discuss the requirement and the type of cam used in

a) Fuel Pump

b) Indicator drive

c) Inlet Valve

d) Exhaust Valve

e) Starting air distributor. (16)

Q7. Analyse the problem of cylinder liner lubrication with reference to oil injection timing relative to piston position, speed and direction of motion. Describe the worst effects of inaccurate lubricant injection timing and how it can have a detrimental effect on developed power in the cylinder. Describe with sketches the arrangement for conveying the oil through the cylinder jacket. (16)

Q7.a) What are the structural parts of 2-stroke main Engine? (6)

b) How are different structural parts held together? (4)

c) What is the function of Cross Head Guides.

(4)

Q9. (a) Describe what would be the indications of crank case explosion in main engine. (4)

(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)

(c) Describe means of prevention of crank case explosion. (4)

Q7. A. Difficulty has been experienced in maintaining engine speed at the set value. State the possible causes and how each of these causes may be detected. (8)

B. Describe the action to be taken in order to ensure safe operation of the main engine plant in the event of complete failure of the remote control and sensing equipment. (8)

Q8. a) State the reasons for persistent slackening of holding down bolts of a main engine. (6)

b) i) State the advantages of using non-metallic choking for main engines. (5)

ii) State precautions to be observed when fitting non-metallic chocks in order to ensure accurate chocking. (5)

Q7. (a) Sketch a section through the bedplate and A frame of a large slow speed engine, identifying parts, method of construction and materials (10)

(b) Explain the function of the tie bolts and how after an alignment problem, these would be tightened (6)