DieselShip's Online Content Library

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.

Q6. (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)