Exercise 7. Discuss the following.
1 Describe all the possible problems with 2-stroke diesel engine.
2. Describe all the solutions to these problems.
3. What is the most common malfunction? How can you escape it?
4. The lube oil changing
5. Refilling with fresh lube oil.
6. Piston examination.
TEST YOURSELF
1. What is a purpose of cylinder head safety valve?
a) A valve for safety stop (emergency) of the engine
b) For indication of engine being overloaded
c) To relieve high pressure in the cylinder to protect the engine from being damaged
d) To adjust the cylinder pressure to a safe working pressure.
2. The starting air valve is fitted for the purpose of:
a) Tuning the engine for staring preparations
b) To retard the engine revolution for maneuvering purpose
c) Bringing the engine up to full rpm to start the engine
d) Bringing the engine up to sufficient number of rpm for combustion to occur and engine to run.
3. When the temperature of lubricating oil is lowered, an increase will occur in:
a) Viscosity
b) Flash point
c) Pour point
d) Concentration of contaminants
4. During operation of the main engine, the heat absorbed by lubricating oil is removed by the:
a) Scavenge air cooler
b) Sump vents
c) Lube oil cooler
d) Any of the above
5. An excessive pressure drop across a lube oil strainer could indicate:
a) Any of the above
b) That the strainer is ok
c) That the strainer needs cleaning
d) That a relief valve is stuck open
6. Why is it important to keep the lube oil viscosity within safe limits?
a) To keep the oil protective film between moving metal surfaces
b) It is not important
c) To keep the additives in good condition
d) The lube oil has no influence on the oil’s lubrication ability
7. What could be the reason if the lube oil viscosity increases?
a) Heavy fuel oil leakage to the lube oil system
b) Water leakage to the lube oil system
c) The lube oil viscosity will not increase
d) High lube oil temperature
8. What could be the reason if the lube oil viscosity decreases?
a) Heavy fuel oil leakage to the lube oil system
b) Low lube oil temperature
c) Wrong lube oil pressure
d) Diesel oil leakage to the lube oil system
9. What are the compartments to be regularly checked with regard to water and oil leakages?
a) Tank top in the engine room
b) Bilge wells
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c) Bilge tank(s)
d) All those listed in the other alternatives.
10. During standstill liquid may condense in the crankcase or oil separator. Why is it important to heat up the oil before start?
a) The compressor will run better
b) Compressor oil regulating system will operate better
c) To avoid the compressor oil to disappear from the crankcase during starting
d) It should never be done.
1 Shipboard Accident Prevention
2 Fire-fighting
3 Boiler
4 Internal combustion engine
5 Pump
6 Liquid treatment
7 Turbines
8 Duties
9 Cargo handling equipment
10 General description of a ship
11 Types of ships
12 Derangements
13 Safe operation of a ship
14 STCW standing orders
15 IMO
Key: 1-b; 2-d; 3-a; 4-c; 5-c; 6-a; 7-a; 8-d; 9-d; 10-c.
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