Q1. State the immediate action to be taken in the event of EACH of the following circumstances occurring with a large main propulsion diesel engine, giving the possible consequences of not taking any action for EACH:
(a) Turbocharger surging during heavy weather (4)
(b) Excessive vibration from turbocharger at full sea speed (4)
(c) Overheating of air start branch pipe to one cylinder during manoeuvring (4)
(d) High main bearing temperature (4)
Q2. With reference to marine diesel engine lubrication:
(a) Define EACH of the following terms:
(i) Viscosity (1)
(ii) Viscosity Index (VI) (1)
(iii) Pour point (1)
(iv) Flash point (1)
(b) Describe FOUR important characteristics of lubricating oil. (8)
(c) State FOUR important additives found in lubricating oil. (4)
Q3. With reference to the diesel engine cooling system:
(a) Explain why cooling is necessary (4)
(b) State the purpose of EACH of the following:
(i) Jacket water heater (4)
(ii) Jacket water drain tank (4)
(iii) Header tank (4)
Q4. (a) Sketch a camshaft timing chain arrangement indicating how the chain tension is adjusted. (12)
(b) State TWO items of ancillary equipment which can be driven via the timing chain. (4)
Q5. State FOUR tests which are required for boiler water, giving a reason for EACH test. (16)
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