DieselShip's Online Content Library

Q4. Misalignment of the main shafting between engine and propeller causes bearing overloads and shaft stress;

A. State the difficulties associated with checking shaft alignment and the reasons why results are unreliable due to external factors;

B. Explain with a simple sketch how a bearing load is assessed.

C. Explain how uneven loading could be rectified

Q4. a) What is the purpose and key procedures involved in the running-in process of a engine, and how does this process contribute to the long-term reliability and performance of the engine? (8)

b) What are the common issues that can arise during the running-in period of a engine, and what measures should be taken to monitor and address these issues to prevent potential damage or inefficiencies? (8)

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

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.