Q8. a. Explain why top bracing is used for large crosshead engines. (4)
b. Describe, with the aid of a sketch, a hydraulic top bracing unit for a large crosshead engine indicating where the top bracing is fitted and how it operates. (6)
C. Write instructions for the checking of a large crosshead engine top bracing system and a holding down system. (6)
Q4. A. Describe, with the aid of a sketch, the lubrication systems for a crosshead engine, explaining the Properties required for the lubricating oil in each system;(10)
b. Describe a system which may be used to ensure that the cylinder lubricating oil properties are available for a crosshead engine when changing between fuels (including between fuel oil and gas), stating why it is not desirable to use the same cylinder LO for different fuel specifications (including gas); (6)
Q2. A. Describe, with the aid of a sketch, the lubrication systems of a crosshead type diesel engine. (8)
B. Explain the properties required by the lubricating oil in each of the systems described in part (a), stating how these properties compare with those of a lubricating oil used in the crankcase of a trunk piston type diesel engine
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