Deck 23: Inlet-Metering Rotary Distributor Pumps

Question 1

Technician A says that most hydromechanical rotary-distributor diesel injection pumps are used in indirect injection (IDI) applications. Technician B says that most hydromechanical rotary-distributor diesel injection pumps are used to fuel off-highway large bore engines. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Answer 1

Technician A only

Question 2

What is the function of the delivery valve used on an inlet metering, opposed plunger, type of rotary distributor pump?

A) raises the nozzle opening pressure
B) retains residual line pressure
C) limits peak line pressure
D) prevents high pressure spikes

Answer 2

retains residual line pressure

Question 3

What is used to lubricate the internal components of an inlet metering, opposed plunger, rotary injection pump during operation?

A) integral supply of engine oil
B) external supply of engine oil
C) sealed bearings
D) fuel from the vane pump

Answer 3

fuel from the vane pump

Question 4

At what relative speed must an inlet metering, opposed plunger injection pump be driven when used to fuel a 4-stroke cycle diesel engine, with 6 engine cylinders?

A) half engine speed
B) engine speed
C) two times engine speed
D) six times engine speed

Question 5

How many high pressure pumping chambers are used in a typical inlet metering, opposed plunger rotary distributor injection pump?

A) one
B) two
C) four
D) six

Question 6

How many pumping plungers are used in the high pressure pump element used in an inlet metering, opposed plunger, rotary distributor pump used to fuel a six cylinder engine?

A) six
B) four
C) two
D) one

Question 7

Technician A says that an inlet metering, opposed plunger rotary distributor pump cannot be used to fuel an engine with more than six cylinders. Technician B says that a Stanadyne opposed plunger, rotary distributor pumps used to be popular on older Ford and GM diesel engines. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 8

An inlet metering, opposed plunger rotary distributor pump is used to fuel an automotive V-8 diesel engine. How many delivery valves are used?

A) one
B) two
C) four
D) eight

Question 9

Technician A says that the outward movement of the opposed plungers in an inlet metering, rotary distributor pump depends on centrifugal force and therefore, pump rotational speed. Technician B says that plunger outboard travel on the same pump is limited by leaf spring stops. Who is right?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 10

What force is used to move the advance piston in an inlet metering, opposed plunger rotary distributor pump that uses no computer controls?

A) spring force
B) centrifugal force
C) hydraulic force
D) mechanical force

Question 11

Which component(s) in an inlet metering, opposed plunger rotary distributor pump is moved by the advance piston?

A) opposed plungers
B) hydraulic head
C) metering valve
D) internal cam ring

Question 12

Which of the following best describes the operating principle of the vane type transfer pumps used on typical inlet metering, opposed plunger, rotary distributor pump?

A) centrifugal
B) constant velocity
C) variable cycle
D) positive displacement

Question 13

Which of the following would have the effect of advancing injection timing in an inlet metering, opposed plunger rotary distributor pump engine?

A) low fuel load in pump chamber
B) high fuel load in pump chamber
C) high filter inlet restriction
D) sticking fuel shutoff solenoid

Question 14

Which name would be most closely associated with the invention of the inlet metering, opposed plunger rotary distributor pump?

A) Bosch
B) General Motors
C) Ford
D) Roosa

Question 15

What U.S. designed, diesel fuel injection pump outsold all other hydromechanical injection pumps manufactured world wide prior to the electronic age of diesel fuel management systems?

A) DPA
B) DB2
C) VE
D) M-100

Question 16

What moves the advance piston in electronically-managed versions of inlet metering, opposed plunger, rotary distributor injection pumps?

A) Fuel pressure
B) Spring force
C) Solenoid
D) Hall-effect sensor

Question 17

What controls the metering valve in an electronically controlled version of an inlet metering, opposed plunger, rotary distributor pump?

A) Engine rpm
B) ECM
C) Fuel pressure
D) Metered fuel quantity

Question 18

When an inlet metering, opposed plunger rotary distributor pump is adapted for management by computer, which of the following terms best describes the system?

A) full authority
B) partial authority
C) state of the art
D) high tech

Question 19

Technician A says that when an inlet metering, opposed plunger rotary distributor pump is ECM controlled, the inboard effective stroke of the plungers is electronically managed. Technician B says that on the same system, the advance piston position is electronically managed. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 20

Identify the partial-authority control system used on inlet metering, opposed plunger, rotary distributor injection pumps that is sometimes found on agricultural and marine applications?

A) DPA-EPIC
B) PEEC
C) V-MAC
D) DDEC