DieselShip's Online Content Library

Q6. 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. (16)

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.

Q2. (a) Describe, with the aid of sketches, the procedure for cutting out and "hanging-up" an engine cylinder of a two-stroke crosshead engine in the event of complete failure of the crosshead pin such that the crosshead pin cannot be operated and no replacement is immediately available. (12)

(b) State, with reasons, the factors which may inhibit starting and limit the operating speed of the engine with a cylinder cut out. (4)

Q7. During recent months It has been necessary to frequently retighten some main engine holding down bolts as the steel chocks have become loose: (a) Explain possible reasons for this. (b) State with reasons why re-chocking using a different material might reduce the Incidence (c) Explain the possible consequences if the situation is allowed to continue unchecked.

Q5. Accidental grounding of the ship in which you are second engineer has occurred while on passage between ports.

a) Describe your immediate concerns as attempts are made to re-float the ship using the main engines (6)

b) Following failure to re-float and assuming operation on residual fuel at the time of the accident state your next priorities (5)

c) Describe any checks or inspection you Consider necessary before restarting the main engine after the ship has been re-floated (5)

Q5. a) Describe the actions and checks required to ensure that a crosshead main propulsion engine may be operated in a slow steaming condition. (8)

b) Explain the problems which may arise during a prolonged period of slow steaming. (4)

c) Explain what actions should be taken before and after the engine is returned to normal operation after a period of slow steaming. (4)

Q5. a) Explain why an engine’s cylinders should develop equal power at all loads, indicating the possible consequences if cylinder power balance is not maintained (6)

b) Describe ONE method which may be used for assessing cylinder power, explaining the steps involved in the assessment (4)

C) Explain how the cylinder power adjustments are made to achieve cylinder power balance (6)

Q4. With reference to abnormal and excessive cylinder liner wear

(a) Explain how may be caused, stating how it is detected: (4)

(b) Explain the effects and consequences of excessive cylinder liner wear (4)

(c)  Explain how abnormal cylinder liner wear may be prevented. (4)

(d) Explain how the liner wear rate is calculated. (4)

--- PREVIOUSLY ASKED AS ---

2021/AUG/02 - 2021/SEP/06

Q6. With reference to large two stroke engine:

(a) Explain how abnormal and excessive cylinder liner wear caused, state how it can be detected:

(b) Explain the effects and consequences of excessive cylinder liner wear

(c)  Explain how abnormal cylinder liner wear may be prevented.