DieselShip's Online Content Library

Q5. With reference to piston rings. (16)

A. State the reasons for breakage.

B. How maintenance and engine operation could minimize breakage?

C. Explain the possible consequences with respect to performance and safety of operating the engine with broken or severely worn piston rings

PREVIOUSLY ASKED

Q4. With reference to Main engine piston rings:

(a) Analyze the causes of piston ring breakage.

(b) How maintenance and engine operation can minimize piston ring breakage.

(c) Explain the possible consequences with respect to performance and safety of operating the engine with broken or severely worn piston rings

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?