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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)

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.

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)

2. (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)

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)

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)

Q1. With reference to scavenge fires:

(a) State FOUR possible contributing factors. (4)

(b) Explain how EACH factor mentioned in (a) contributes. (8)

(c) State FOUR indications. (4)

Q3. (a) Answer the following:

(i) State why the simultaneous injection of fuel oil and starting air into a main engine cylinder is undesirable. (2)

(ii) Explain how simultaneous injection of fuel oil and starting air is prevented. (4)

(b) Answer the following:

(i) Explain how a leaking air start valve is detected while the engine is running. (4)

(ii) Describe the actions to be taken upon discovery of a leaking air start valve. (6)

Q4. With reference to main diesel engine starting air lines:

(a) Describe the main cause of a starting air line explosion. (8)

(b) Explain how a leaking start air valve can be identified while the engine is running. (4)

(c) State four different safety devices which can be incorporated into the starting air line to limit the damage caused by an explosion. (4)

Q1. Describe the procedure for preparing a main engine, from cold, for sea service (16)

Q2. (a) Describe how modern diesel engines are pressure charged. (8)

(b) State TWO reasons for cooling the charge air before it enters the engine. (8)

Q1. (a) Explain why an engine may fail to start on air when the start air receiver is fully charged and the air receiver outlet to the engine is open.(10)

b) Describe how problems with air start systems may be avoided. (6)