1. With reference to medium speed diesel engine, state four causes for each of the following faults. a. Lubrication oil pressure low b. Exhaust temp. high in single unit. c. Exhaust temp. high in all unit.

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IMPORTANT QUESTION FOR WRITTEN EXAM

1. With reference to medium speed diesel engine, state four causes for each of the following faults.
a. Lubrication oil pressure low (3)
b. Exhaust temp. high in single unit. (3)
c. Exhaust temp. high in all unit. (4)                                                            

Ans (a): Four reason for low lubrication oil pressure:

1)      Low oil level

2)      Too high or too low viscosity

3)      Engine wear

4)      Defective oil pressure gauge

5)      Filter plugged or dirty

6)      Pump wear

Ans (b): Reason for exhaust Temp high in single unit:

1)      Misfire in that specific cylinder

2)      Injecting too much fuel

3)      Faulty sensor

4)      Faulty injector

5)      Poor atomization

Ans (c): Four reasons for high exhaust temp in all units:

1)      Incorrect fuel injection timing

2)      Wrong v/v timing

3)      Leaky exhaust v/v

4)      Bad atomization/Poor quality fuel

5)      Greater load

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