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Q6. A significant number of machinery failures are due to poor maintenance techniques.

State, with reasons, the possible consequences of poor maintenance techniques on EACH of the following:

(a) Main engine lubricating oil self-cleaning filters. (4)

(b) Cylinder liner honing. (4)

(c) Auxiliary engine bottom end bearing overhaul. (4)

(d) Fitting of piston compression and oil control rings. (4)

Q1. (a) State the reason for turning the engine with the turning gear prior to starting (4)

(b) State the reason for leaving the indicator cocks on main engine cylinders open when the engine is turned initially with the turning gear. (4)

(c) State the reason for leaving the lubricating oil circulating after "Finish with Engines". (4)

(d) State why diesel alternator cooling water may be circulated through the main engine after shutdown. (4)

Q3. With reference to engine operation:

a) State, with reasons, the symptoms which would indicate a cylinder head had cracked between the combustion chamber and the water space. (4)

b) describe the actions that should be taken if the engine with the symptoms in part (a) cannot be immediately stopped. (6)

c) write a report to the Superintendent outlining the probable cause and actions to prevent further occurrence.

Q2. Describe the function of EACH of the following components of a diesel engine:

(a) Chocks (4)

(b) Bedplate (4)

(c) Tie rods (4)

(d) Entablature. (4)

Q4. (a) List TWO automatic main engine slowdown parameters, stating why EACH is applied to an engine. (4)

(b) List Two automatic main engine shutdown parameters, stating why EACH is applied to an engine. (4)

(c) Explain how EACH of the parameters listed in part (a) and part (b) are tested for the correct operation. (8)

Q3. With reference to a main engine air starting system:

(a) State FIVE important safety features fitted to the system (10)

(b) State how a leaking air start valve may be detected when the engine is running (2)

(c) Explain the dangers of allowing a leaking air start valve to persist (4)

Q2. (a) With reference to combustion within a two-stroke diesel engine, state the effect of EACH of the following:

(i) Early injection. (6)

(ii) Late injection. (6)

(b) Sketch an Out of Phase diagram (draw card) for a two stroke diesel engine. (4)

Q2. Describe, with the aid of a sketch, the operational principles of a main engine exhaust gas turbo-charger. (16)

Q4. With reference to marine diesel engines:

(a) State the purpose of a camshaft. (2)

(b) State TWO methods of driving a camshaft on a large marine diesel engine. (4)

(c) State the speed of the camshaft relative to the crankshaft on:

(i) A four-stroke engine: (2)

(ii) A two-stroke engine. (2)

(d) Sketch a fuel cam for a unidirectional diesel engine indicating EACH of the following:

(i) Point of injection. (2)

(ii) Peak. (2)

(iii) Slow return. (2)

Q4. With reference to the reversing of an engine:

(a) Describe THREE methods by which it may be achieved (12)

(b) Explain what is meant by lost motion (4)

Q1. With respect to Main Propulsion Engines, state the immediate action to be taken as Engineer Officer of the watch in the event of EACH of the following, stating ONE reason why EACH action is necessary:

(a) Turbocharger repeatedly surging. (4)

(b) Air start manifold/branch pipe overheating local to one unit. (4)

(c) Low scavenge air temperature alarm. (4)

(d) Engine misfires, fuel rail pressure low alarm activates, booster pump pressure high (4)

Q2. (a) Sketch a typical power indicator card for a slow speed marine diesel engine. (6)

(b) Explain how the card may be used to assess the power developed in the cylinder. (10)