190203c

Question 0

All diesel fuel injection systems must perform what five functions ?

Answer 0

1. Timing - inject the fuel at the correct time.
2. Rate - inject the fuel at the correct rate.
3. Atomization - atomize the fuel for proper combustion.
4. Metering - meter the fuel to meet the needs of the engine.
5. Penetration - inject the fuel at pressure high enough to penetrate the combustion chamber

Question 1

The two common types of diesel fuel injection systems are ?

Answer 1

Multi-plunger injection pump system and unit-type injector fuel system

Question 2

Optimum crank angle is usually between ?

Answer 2

20 degrees to 25 degrees after top dead centre ( ATDC )

Question 3

Beginning of injection ( BOI ) occurs how many degrees before top dead centre ( BTDC )

Answer 3

Seven degrees

Question 4

Timing that occurs after manufactures specifications is said to be ?

Answer 4

Retarded ( late)

Question 5

Timing that occurs before manufacturers specifications is said to be ?

Answer 5

Advanced ( early )