Critically analyse why variable exhaust valve

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Reference no: EM132485051

Advanced Marine Engineering Knowledge (Motor)

Question 1. With reference to Crankcase diaphragm glands (Stuffing Box),
a. Explain why effectiveness deteriorates in service
b. Describe the procedure for renewal of parts so that efficiency is restored
c. Describe how effectiveness is restored if spares are unavailable on board due to current epidemic COVID 19 and will be delayed supply up to 4 months or more. What would you do as chief engineer because You must run Engine in optimum condition

Question 2. With reference to the Marine slow speed engine cylinder head exhaust valves
a. Discuss with reason, the indication of valve burns out and what will be the causes for ?above valve burn out,
b. Assume you are the chief engineer of the vessel and what is your best practice to minimise above valve failure situations.
c. Critically analyse why variable exhaust valve closing can be advantageous in the operation of large slow speed main Engines and Discuss any mechanism for variable exhaust timing you know which are employed in current marine slow speed diesel engines

Question 3. In regard to Crank shaft deflection in large slow speed main engine. Describe the action that should be taken if the current reading deviates significantly from the previous readings

Question 4. Assume you are the newly signed- on Chief Engineer officer to your vessel and as part of your company policy you must carry out detailed Piston /Liner inspection via Cylinder scavenge ports to evaluate your engine condition to attach new chief engineer taking over report.

Make detail report which could present to your technical manager explaining the key area of inspection with at least four possible defects which you found during your inspection with possible causes and your suggestions which should be taken to prevent their re- occurrence.

With reference to a Piston which has been removed from a liner of a main Engine. Assume you are the in-charge engineer of decarb job and how do you assume whether piston and liner suitable for further use.

Question 5. Describe the cam shaft chain drive for a large slow speed two Stroke engine, incorporate with chain tightening wheel and primary and secondary Moment compensators.

b. Explain how chain slackness is caused and it effect on engine operation.

c. What is the vibration excitation sources in Propulsion engines other than external unbalanced moment and Explain with suitable drawings counter measuring devices fitted for above.

Reference no: EM132485051

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