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)
Q5. Discuss the consequences of failure to maintain correct clearances in the case of main diesel engine crankshaft and bottom end bearings. Sketch a bottom end bearing paying particular attention to the arrangement of ensuring uninterrupted flow of oil to the top end bearing.
Q2. During a routine crankcase inspection a main engine top end bearing is found to be wiped and subsequent inspection shows that the pin is badly scored.
A. Explain in detail the action which should be taken to enable the engine to be safety operated so that the vessel may reach a port where effective repair facilities are available.
B. State with reasons the factors which influence the speed at which the engine may be safely operated.
Q6. During recent months a number Of fuel injector needle valves have seized in their bodies during engine operation. a. Explain the effects on engine operation. b. State the possible causes. c. As Second Engineer, state with reasons, the instructions to be issued in order to minimize this problem.
Q4. How is fuel oil injected into the cylinder of a heavy oil two stroke cycle internal combustion engine and how is it ignited? Show by a timing diagram at what point of stroke injection of the fuel begins and ends. Name the engine to which your answer refers. Explain the effect of advancing the timing of injection on: i. Fuel per brake horse power hour; ii. Exhaust temperature; iii. Cylinder maximum pressure
Q9. If a main engine piston seizes in its liner at sea and it is not possible to replace the unit, explain, in detail, what provisions are made in the engine, to enable the ship to reach port?
Q7. During morning inspection after an overnight period of UMS operation the following changes were detected:
(a) A slight but perceptible change in engine noise
(b) An alternation in engine speed.
(c) A change in exhaust temperature spread pattern.
Explain, with reasons, the possible causes of each such changes, indicating how normal operations might be restored.
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