Question 1

When a port helix metering pump is phased to a 4-stroke cycle engine, how many times does the engine rotate through one complete pump revolution?

Accepted Answer

A)  180 degrees 
B)  1 revolution 
C)  2 revolutions 
D)  4 revolutions 
A)  180 degrees 
B)  1 revolution 
C)  2 revolutions 
D)  4 revolutions

Question 2

Which of the following is true regarding plunger effective stroke:

Accepted Answer

A)  it is constant 
B)  varies with engine rpm 
C)  varies with fuel requirement 
D)  varies with manifold boost 
A)  it is constant 
B)  varies with engine rpm 
C)  varies with fuel requirement 
D)  varies with manifold boost

Question 3

When the plunger on a port helix metering pump is at TDC, what else is true?

Accepted Answer

A)  delivery valve is open 
B)  the pump chamber is at peak pressure 
C)  cam is on outer base circle 
D)  cam is on base circle 
A)  delivery valve is open 
B)  the pump chamber is at peak pressure 
C)  cam is on outer base circle 
D)  cam is on base circle

Question 4

What is used to move the fuel rack in an electronically-controlled, Bosch 8500 injection pump?

Accepted Answer

A)  governor assembly 
B)  rack position sensor 
C)  rack actuator 
D)  hydraulic servo 
A)  governor assembly 
B)  rack position sensor 
C)  rack actuator 
D)  hydraulic servo

Question 5

Which of the following port-helix metering pump, static timing procedures would provide the highest accuracy?

Accepted Answer

A)  high pressure 
B)  timing pin 
C)  transducer and timing light 
D)  electronic 
A)  high pressure 
B)  timing pin 
C)  transducer and timing light 
D)  electronic

Question 6

In the Bosch PE 7100/8500 rack position sensor assembly, what is the difference between the measuring and reference coil windings?

Accepted Answer

A)  measuring coil uses larger number of windings 
B)  none, they are identically wound 
C)  reference coil uses heavier gauge wire 
D)  reference coil has moving short circuit window 
A)  measuring coil uses larger number of windings 
B)  none, they are identically wound 
C)  reference coil uses heavier gauge wire 
D)  reference coil has moving short circuit window

Question 7

If a 20 degree Econovance unit is installed to a V-MAC, Bosch PE8500 injection pump and static timing is specified at 7 degrees before TDC, what is the maximum possible port-closure advance?

Accepted Answer

A)  13 degrees ATDC 
B)  7 degrees BTDC 
C)  13 degrees BTDC 
D)  27 degrees BTDC 
A)  13 degrees ATDC 
B)  7 degrees BTDC 
C)  13 degrees BTDC 
D)  27 degrees BTDC

Question 8

What type of diesel fuel system is usually being referred to when it is described as PLN (pump-line-nozzle)?

Accepted Answer

A)  pressure-time system 
B)  MUI system 
C)  EUI system 
D)  port helix metering system 
A)  pressure-time system 
B)  MUI system 
C)  EUI system 
D)  port helix metering system

Question 9

In a typical port helix metering pump, which of the following components is rotated?

Accepted Answer

A)  pump barrel 
B)  camshaft 
C)  tappets 
D)  control rack 
A)  pump barrel 
B)  camshaft 
C)  tappets 
D)  control rack

Question 10

What is used to signal engine position in a Bosch PE8500 pump with an RE30 rack actuator such as that used in a Mack Trucks V-MAC II managed engine?

Accepted Answer

A)  camshaft position sensor (CPS) 
B)  crankshaft speed sensor (CSS) 
C)  timing event marker (TEM) 
D)  synchronous reference sensor (SRS) 
A)  camshaft position sensor (CPS) 
B)  crankshaft speed sensor (CSS) 
C)  timing event marker (TEM) 
D)  synchronous reference sensor (SRS)

Question 11

In which of the following applications would a hydromechanical port-helix metering pump be found in an EPA MY 2017 compliant onhighway application?

Accepted Answer

A)  Pick up and delivery van 
B)  Reefer powerplant 
C)  LTL tractor 
D)  Linehaul tractor 
A)  Pick up and delivery van 
B)  Reefer powerplant 
C)  LTL tractor 
D)  Linehaul tractor

Question 12

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

Accepted Answer

A)  barrel 
B)  plunger 
C)  tappet 
D)  control rack 
A)  barrel 
B)  plunger 
C)  tappet 
D)  control rack

Question 13

What is used to lubricate the cambox components in a typical highway truck, port-helix metering injection pump?

Accepted Answer

A)  dedicated oil in the cambox sump 
B)  lithium base, high temperature grease 
C)  fuel at charging pressure 
D)  engine lubricating oil circuit 
A)  dedicated oil in the cambox sump 
B)  lithium base, high temperature grease 
C)  fuel at charging pressure 
D)  engine lubricating oil circuit

Question 14

What happens to fuel in the pump chamber of a port-helix metering pump at port opening?

Accepted Answer

A)  fuel is forced through the delivery valve 
B)  fuel spills to the charging gallery 
C)  fuel exits the fuel injector 
D)  fuel is re-routed to the transfer pump 
A)  fuel is forced through the delivery valve 
B)  fuel spills to the charging gallery 
C)  fuel exits the fuel injector 
D)  fuel is re-routed to the transfer pump

Question 15

What replaces the governor housing in an electronically controlled, port-helix metering injection pump?

Accepted Answer

A)  rack actuator housing 
B)  computer module 
C)  sensor housing 
D)  transducer module 
A)  rack actuator housing 
B)  computer module 
C)  sensor housing 
D)  transducer module

Question 16

Convert one bar to an approximate psi value:

Accepted Answer

A)  15 psi 
B)  30 psi 
C)  60 psi 
D)  120 psi 
A)  15 psi 
B)  30 psi 
C)  60 psi 
D)  120 psi

Question 17

Which of the following port-helix metering pump, static timing procedures would provide the least accuracy?

Accepted Answer

A)  high pressure 
B)  timing pin 
C)  transducer and timing light 
D)  electronic 
A)  high pressure 
B)  timing pin 
C)  transducer and timing light 
D)  electronic

Question 18

What is the reason for using helices milled diametrically opposite on a plunger?

Accepted Answer

A)  increase fuel quantity 
B)  decrease fuel quantity 
C)  improve lubrication 
D)  hydraulic balance 
A)  increase fuel quantity 
B)  decrease fuel quantity 
C)  improve lubrication 
D)  hydraulic balance

Question 19

When the plunger metering recesses have minimum exposure to the spill port(s) through plunger stroke, how is the engine being fueled?

Accepted Answer

A)  full fuel 
B)  no fuel 
C)  half fuel 
D)  idle fuel 
A)  full fuel 
B)  no fuel 
C)  half fuel 
D)  idle fuel

Question 20

Which of the following procedures would be the correct method of recalibrating fuel output from one pump element on a port-helix metering injection pump?

Accepted Answer

A)  rotating the barrel 
B)  shimming the barrel flange 
C)  advancing port closure timing 
D)  increasing the charging pressure 
A)  rotating the barrel 
B)  shimming the barrel flange 
C)  advancing port closure timing 
D)  increasing the charging pressure

Exam 22: Port-Helix Metering Injection Pumps

When a port helix metering pump is phased to a 4-stroke cycle engine, how many times does the engine rotate through one complete pump revolution?

Which of the following is true regarding plunger effective stroke:

When the plunger on a port helix metering pump is at TDC, what else is true?

What is used to move the fuel rack in an electronically-controlled, Bosch 8500 injection pump?

Which of the following port-helix metering pump, static timing procedures would provide the highest accuracy?

In the Bosch PE 7100/8500 rack position sensor assembly, what is the difference between the measuring and reference coil windings?

If a 20 degree Econovance unit is installed to a V-MAC, Bosch PE8500 injection pump and static timing is specified at 7 degrees before TDC, what is the maximum possible port-closure advance?

What type of diesel fuel system is usually being referred to when it is described as PLN (pump-line-nozzle)?

In a typical port helix metering pump, which of the following components is rotated?

What is used to signal engine position in a Bosch PE8500 pump with an RE30 rack actuator such as that used in a Mack Trucks V-MAC II managed engine?

In which of the following applications would a hydromechanical port-helix metering pump be found in an EPA MY 2017 compliant onhighway application?

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

What is used to lubricate the cambox components in a typical highway truck, port-helix metering injection pump?

What happens to fuel in the pump chamber of a port-helix metering pump at port opening?

What replaces the governor housing in an electronically controlled, port-helix metering injection pump?

Convert one bar to an approximate psi value:

Which of the following port-helix metering pump, static timing procedures would provide the least accuracy?

What is the reason for using helices milled diametrically opposite on a plunger?

When the plunger metering recesses have minimum exposure to the spill port(s) through plunger stroke, how is the engine being fueled?

Which of the following procedures would be the correct method of recalibrating fuel output from one pump element on a port-helix metering injection pump?

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Cooling Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Subsystems

Fuel Injection Basics and Governor Principles

Injector Nozzles

Inlet-Metering Rotary Distributor Pumps

Sleeve-Metering Rotary Distributor Pumps

Single-Actuator Eui Systems

Dual-Actuator Eui Systems

Heui Fuel Systems

Electronic Unit Pump Eup Systems

Cummins Hpi-Tp

Common Rail Systems

Amplified Common Rail Systems

Review of Electrical and Electronics Fundamentals

Vehicle Computer Systems

Ests and Siss

Electrical Wiring, Connector Terminal Repair

Multiplexing

The Connected Vehicle

Natural Gas, Propane, and Biodiesel Fuels

High Voltage Electricity

Hybrid and Hydrogen Fuel Cell Drivetrains

Electric Powertrains

Bosch Edc Systems

Caterpillar Engine Management Systems

Cummins Management Systems

Detroit Diesel Electronic Controls Ddec

Navistar Diamond Logic

Paccar Engine Management Systems

Volvo and Mack Engine Management

Emissions Management

Servicing Maintenance of Exhaust Aftertreatment Systems

Failure Analysis

Troubleshooting and Diagnostics

Filters