Question 1

A plunger in a port-helix metering pump with a lower helix would produce which of the following timing characteristics?

Accepted Answer

A)  variable beginning, variable ending 
B)  variable beginning, constant ending 
C)  constant beginning, variable ending 
D)  constant beginning, constant ending 
A)  variable beginning, variable ending 
B)  variable beginning, constant ending 
C)  constant beginning, variable ending 
D)  constant beginning, constant ending C

Question 2

What does a variable timing device such as Econovance allow an ECM managing a Bosch 8500 injection pump to control?

Accepted Answer

A)  exact moment of ignition 
B)  injection timing advance 
C)  centrifugal timing advance 
D)  engine cylinder pressure 
A)  exact moment of ignition 
B)  injection timing advance 
C)  centrifugal timing advance 
D)  engine cylinder pressure B

Question 3

How is the engine being fueled when the vertical slot aligns with the spill port throughout plunger stroke?

Accepted Answer

A)  full fuel 
B)  high idle fuel 
C)  peak torque fuel 
D)  no fuel 
A)  full fuel 
B)  high idle fuel 
C)  peak torque fuel 
D)  no fuel D

Question 4

Which is the stationary member of the pumping element used in a port helix metering pump?

Accepted Answer

A)  tappet 
B)  plunger 
C)  delivery valve body 
D)  barrel 
A)  tappet 
B)  plunger 
C)  delivery valve body 
D)  barrel

Question 5

Where is the oil sump located in a port helix metering injection pump?

Accepted Answer

A)  tappet bay 
B)  charging gallery 
C)  cambox 
D)  flange housing 
A)  tappet bay 
B)  charging gallery 
C)  cambox 
D)  flange housing

Question 6

Which of the following procedures would adjust the phase angle of one pump element in a port-helix metering injection pump?

Accepted Answer

A)  shimming the fuel pump drive gear 
B)  rotating the barrel 
C)  shimming the barrel flange 
D)  repositioning the control rack 
A)  shimming the fuel pump drive gear 
B)  rotating the barrel 
C)  shimming the barrel flange 
D)  repositioning the control rack

Question 7

Plunger to barrel clearances are lapped in manufacture in port-helix metering injection pumps to tolerances between:

Accepted Answer

A)  one half and one micron 
B)  two and four microns 
C)  six and eight microns 
D)  ten and twelve microns 
A)  one half and one micron 
B)  two and four microns 
C)  six and eight microns 
D)  ten and twelve microns

Question 8

What is the function of an aneroid used in the governor of a port-helix metering injection pump?

Accepted Answer

A)  measure fuel injection pressure 
B)  meters fuel to the engine 
C)  measures manifold boost 
D)  measures cylinder pressure 
A)  measure fuel injection pressure 
B)  meters fuel to the engine 
C)  measures manifold boost 
D)  measures cylinder pressure

Question 9

What is used to seal fuel in the plunger/pump chamber from the cambox in a typical port-helix metering pump?

Accepted Answer

A)  rubber seal 
B)  neoprene seal 
C)  viscous seal 
D)  anaerobic seal 
A)  rubber seal 
B)  neoprene seal 
C)  viscous seal 
D)  anaerobic seal

Question 10

What is another way describing the linear magnet used as a rack position sensor in a Bosch 8500 fuel injection pump with an RE30 rack actuator?

Accepted Answer

A)  potentiometer 
B)  Hall effect switch 
C)  linear proportioning solenoid 
D)  latching solenoid 
A)  potentiometer 
B)  Hall effect switch 
C)  linear proportioning solenoid 
D)  latching solenoid

Question 11

Which of the following does most to define the residual line pressure value?

Accepted Answer

A)  sectional area of the delivery valve 
B)  length of the flutes 
C)  peak injection pressure value 
D)  swept volume of the retraction piston 
A)  sectional area of the delivery valve 
B)  length of the flutes 
C)  peak injection pressure value 
D)  swept volume of the retraction piston

Question 12

What is used to support the camshaft in a port helix metering pump in the cambox?

Accepted Answer

A)  bearings 
B)  bushings 
C)  hydrodynamics 
D)  pedestals 
A)  bearings 
B)  bushings 
C)  hydrodynamics 
D)  pedestals

Question 13

Which of the following explains the need to bar the engine only in its correct direction of rotation when timing a hydromechanical port-helix metering, injection pump to an engine?

Accepted Answer

A)  delivery valve core seating 
B)  engine timing gear backlash factors 
C)  timing index location 
D)  calibration pointer location 
A)  delivery valve core seating 
B)  engine timing gear backlash factors 
C)  timing index location 
D)  calibration pointer location

Question 14

When adjusting static timing on a hydromechanical, port-helix metering injection pump to the engine, which of the following steps in the procedure should be performed last?

Accepted Answer

A)  remove the delivery valve core 
B)  remove the high pressure line 
C)  locate injection pump port closure 
D)  loosen pump drive plate to drive gear fasteners 
A)  remove the delivery valve core 
B)  remove the high pressure line 
C)  locate injection pump port closure 
D)  loosen pump drive plate to drive gear fasteners

Question 15

What event ends the effective stroke in a port helix metering injection pump?

Accepted Answer

A)  port opening 
B)  port closure 
C)  delivery valve closure 
D)  injector closure 
A)  port opening 
B)  port closure 
C)  delivery valve closure 
D)  injector closure

Question 16

Convert 75 psi to bar and round to one of the following values:

Accepted Answer

A)  two bar 
B)  four bar 
C)  five bar 
D)  six bar 
A)  two bar 
B)  four bar 
C)  five bar 
D)  six bar

Question 17

What event begins the effective stroke in a port helix metering injection pump?

Accepted Answer

A)  port opening 
B)  port closure 
C)  delivery valve opening 
D)  delivery valve closure 
A)  port opening 
B)  port closure 
C)  delivery valve opening 
D)  delivery valve closure

Question 18

Which of the following is the most common method of shutting down an engine fueled by a hydromechanical port helix metering injection pump?

Accepted Answer

A)  control rack to no fuel 
B)  de-energize shutdown solenoid 
C)  energize shutdown solenoid 
D)  choke off intake air 
A)  control rack to no fuel 
B)  de-energize shutdown solenoid 
C)  energize shutdown solenoid 
D)  choke off intake air

Question 19

Which of the following terms means the same thing as static timing?

Accepted Answer

A)  port closure timing 
B)  port opening timing 
C)  injection timing 
D)  ignition timing 
A)  port closure timing 
B)  port opening timing 
C)  injection timing 
D)  ignition timing

Question 20

What component is directly responsible for moving the control rack in a mechanical port helix metering injection pump?

Accepted Answer

A)  camshaft 
B)  speed control lever 
C)  decompression lever 
D)  governor 
A)  camshaft 
B)  speed control lever 
C)  decompression lever 
D)  governor

Exam 22: Port-Helix Metering Injection Pumps

A plunger in a port-helix metering pump with a lower helix would produce which of the following timing characteristics?

What does a variable timing device such as Econovance allow an ECM managing a Bosch 8500 injection pump to control?

How is the engine being fueled when the vertical slot aligns with the spill port throughout plunger stroke?

Which is the stationary member of the pumping element used in a port helix metering pump?

Where is the oil sump located in a port helix metering injection pump?

Which of the following procedures would adjust the phase angle of one pump element in a port-helix metering injection pump?

Plunger to barrel clearances are lapped in manufacture in port-helix metering injection pumps to tolerances between:

What is the function of an aneroid used in the governor of a port-helix metering injection pump?

What is used to seal fuel in the plunger/pump chamber from the cambox in a typical port-helix metering pump?

What is another way describing the linear magnet used as a rack position sensor in a Bosch 8500 fuel injection pump with an RE30 rack actuator?

Which of the following does most to define the residual line pressure value?

What is used to support the camshaft in a port helix metering pump in the cambox?

Which of the following explains the need to bar the engine only in its correct direction of rotation when timing a hydromechanical port-helix metering, injection pump to an engine?

When adjusting static timing on a hydromechanical, port-helix metering injection pump to the engine, which of the following steps in the procedure should be performed last?

What event ends the effective stroke in a port helix metering injection pump?

Convert 75 psi to bar and round to one of the following values:

What event begins the effective stroke in a port helix metering injection pump?

Which of the following is the most common method of shutting down an engine fueled by a hydromechanical port helix metering injection pump?

Which of the following terms means the same thing as static timing?

What component is directly responsible for moving the control rack in a mechanical port helix metering injection pump?

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