2017 International® A26 Engine Overview

Study Guide

Course Code: 9022

 ©2017 Navistar®, Inc.
2701 Navistar Drive, Lisle, IL 60532

All rights reserved.

No part of this publication may be duplicated or

stored in an information retrieval system without
the express written permission of Navistar®, Inc.
1 2017 International® A26 Engine Overview ● Study Guide

Table of Contents
Course Introduction ...................................................................................................................................... 5
Welcome ................................................................................................................................................... 5
Objectives ................................................................................................................................................. 5
Module 1: Engine Identification.................................................................................................................... 6
Engine Specifications ................................................................................................................................ 6
Engine Description ................................................................................................................................ 6
Engine Identification ................................................................................................................................. 6
Engine Serial Number............................................................................................................................ 6
Module 2: Air Management System ............................................................................................................. 7
Intake Airflow ............................................................................................................................................ 7
Air Filter Housing................................................................................................................................... 7
Air Inlet Pipe .......................................................................................................................................... 7
MAF-IAT ................................................................................................................................................ 7
Variable Geometry Turbocharger ......................................................................................................... 7
VGT Actuator ......................................................................................................................................... 7
TCOT ...................................................................................................................................................... 7
Charge Air Cooler .................................................................................................................................. 7
Cold Start Fuel Injector ......................................................................................................................... 7
Cylinder Head ........................................................................................................................................ 8
IMT ........................................................................................................................................................ 8
Exhaust Airflow ......................................................................................................................................... 8
EGR Valve .............................................................................................................................................. 8
EGR Cooler ............................................................................................................................................ 8
EGR Outlet Manifold ............................................................................................................................. 8
EGR Mixing Duct.................................................................................................................................... 8
Exhaust Manifold .................................................................................................................................. 8
EBP Sensor ............................................................................................................................................ 8
EET Sensor ............................................................................................................................................. 9
Exhaust Manifold Flow.......................................................................................................................... 9
Module 3: Cooling Management System.................................................................................................... 10
Base Engine Flow .................................................................................................................................... 10
Water Distribution Housing ................................................................................................................ 10
Water Pump ........................................................................................................................................ 10
Thermostat Housing............................................................................................................................ 10
ECT Sensor........................................................................................................................................... 10

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 2017 International® A26 Engine Overview ● Study Guide 2

Below Operating Temperature ........................................................................................................... 10

Flow through Cylinder Head and Crankcase ....................................................................................... 10
Rear Coolant Manifold Flow ............................................................................................................... 10
Heater Return Tube ............................................................................................................................ 11
Flow to Radiator .................................................................................................................................. 11
Engine Fan ........................................................................................................................................... 11
Flow Back to Water Distribution Housing ........................................................................................... 11
EGR System Flow..................................................................................................................................... 11
Flow to EGR Cooler ............................................................................................................................. 11
EGR Valve Flow ....................................................................................................................................... 11
AFTHD Coolant Flow ............................................................................................................................... 11
Module 4: Fuel Delivery System ................................................................................................................. 13
Flow to Primary Fuel Filter .................................................................................................................. 13
Primary Fuel Filter ............................................................................................................................... 13
Primer Pump ....................................................................................................................................... 13
Low Pressure Fuel Pump ..................................................................................................................... 13
Secondary Fuel Filter Module ............................................................................................................. 13
Fuel Delivery Pressure Sensor ............................................................................................................. 14
Tee Fitting ........................................................................................................................................... 14
High Pressure Fuel Pump .................................................................................................................... 14
Engine Fuel Actuator 1 ........................................................................................................................ 14
High Pressure Fuel Flow ...................................................................................................................... 14
Aftertreatment Hydrocarbon Doser ................................................................................................... 15
AFTFP Sensor....................................................................................................................................... 15
AFTFEA ................................................................................................................................................ 15
Aftertreatment Purge Air Actuator ..................................................................................................... 15
Module 5: Lubrication System .................................................................................................................... 16
Engine Oil Level Sensor ....................................................................................................................... 16
Pickup Tube ......................................................................................................................................... 16
Oil Pump .............................................................................................................................................. 16
Oil Module........................................................................................................................................... 16
Engine Oil Pressure Sensor ................................................................................................................. 16
Oil Cooler ............................................................................................................................................ 16
Crankcase Breather Oil Separator....................................................................................................... 16
Engine Oil Temperature Sensor .......................................................................................................... 17
Oil Flow ............................................................................................................................................... 17
VGT Oil Flow ........................................................................................................................................ 17

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3 2017 International® A26 Engine Overview ● Study Guide

Module 6: Gear Train .................................................................................................................................. 18

Front Gear Train .................................................................................................................................. 18
Rear Gear Train ................................................................................................................................... 18
Module 7: Electrical Control ....................................................................................................................... 19
Engine Control Module ....................................................................................................................... 19
Engine Harness .................................................................................................................................... 19
Injector Harness .................................................................................................................................. 19
Conclusion ................................................................................................................................................... 20

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 2017 International® A26 Engine Overview ● Study Guide 4

This Page Intentionally Left Blank.

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5 2017 International® A26 Engine Overview ● Study Guide

Course Introduction

THE INFORMATION PROVIDED WITHIN THIS COURSE IS FOR TRAINING PURPOSES ONLY. ALWAYS
CONSULT THE LATEST SERVICE, DIAGNOSTIC, AND TOOL INFORMATION, LOCATED ON THE
INTERNATIONAL® SERVICE PORTAL℠, PRIOR TO PERFORMING SERVICE ON ENGINES, VEHICLES,
AND EQUIPMENT.

Welcome
Welcome to the Navistar® training course: 2017 International® A26 Engine Overview. This course is
intended to provide an overview of the 2017 International® A26 Engine.

Objectives
Upon completion of this course, the viewer will be able to identify and describe:
 The 2017 International® A26 Engine
 The Air Management System
 The Cooling Management System
 The Fuel Delivery System
 The Gear Train
 The Electrical Control System

Notes

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 2017 International® A26 Engine Overview ● Study Guide 6

Module 1: Engine Identification

Engine Specifications
Engine Description

The 2017 International® A26 is 12.4-liter diesel six-cylinder engine, capable of producing 375 to 475
horsepower and 1,350 to 1,750 pound feet of torque. The 2017 International® A26 engine has a dry
weight of 2,299 pounds and a compression ratio of 18.5 to 1.

Engine Identification
There are several ways to identify the 2017 International® A26 engine which include the emissions label,
and Engine Serial Number, or ESN, engraving.

The emissions label is located on top of the valve cover. The emissions label typically includes the
following: Model year; engine family; model and displacement; Advertised brake horsepower and
torque rating; emissions family and control system; valve lash specifications; and ESN.

Engine Serial Number

The ESN engraving is located on the upper left side of the crankcase.

Notes

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7 2017 International® A26 Engine Overview ● Study Guide

Module 2: Air Management System

Intake Airflow
Air Filter Housing

The engine air filter housing contains a filter that removes particulates and debris from the air entering
the engine.

Air Inlet Pipe

The air inlet pipe is mounted on the right side of the engine, and connects the air filter housing to the
inlet of the Variable Geometry Turbocharger, or VGT.

MAF-IAT

The air inlet pipe also contains a combination sensor made up of the Mass Air Flow sensor and the
Intake Air Temperature sensor, or MAF / IAT, sensor. This combination sensor, called the MAF / IAT,
measures the amount and temperature of the air entering the VGT.

Variable Geometry Turbocharger

The Variable Geometry Turbocharger, or VGT, is mounted on the right side of the engine and
compresses air drawn from the air filter housing.

This VGT utilizes adjustable internal vanes that route exhaust gasses across the exhaust turbine of the
turbocharger.

VGT Actuator

To control boost pressure, the VGT actuator adjusts the angle of the vanes. The VGT actuator
communicates across the private J1939 data link.

TCOT

Charge air exiting the turbocharger outlet passes the Turbocharger Outlet Temperature, or TCOT,
sensor. The TCOT sensor measures the temperature of the charge air.

Charge Air Cooler

The Charge Air Cooler, or CAC, exchanges heat from the charge air passing through it to the ambient air
passing across the outside of the fins. The CAC is part of the cooling package.

Cold Start Fuel Injector

If the engine is equipped with a Cold Start Fuel Ignitor, or CSFI, it will be located on the Exhaust Gas
Recirculation, or EGR, mixing duct.

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 2017 International® A26 Engine Overview ● Study Guide 8

Cylinder Head

The cylinder head is bolted to the top of the crankcase, and routes mixed charge air in, and exhaust
gasses out of the cylinders.

IMT

The Intake Manifold Temperature, or IMT, sensor monitors charge air temperature in the intake
manifold. The IMT sensor is installed on the intake channel of the cylinder head.

Exhaust Airflow
EGR Valve

The Exhaust Gas Recirculation, or EGR, valve is a single butterfly-type valve that regulates the amount of
exhaust flowing through the EGR cooler. The EGR valve is mounted behind the EGR cooler, in between
the front and rear bellows pipes.

EGR Cooler

The single stage EGR cooler is mounted to the engine above the exhaust manifold. The EGR cooler is
laser welded, and uses engine coolant to remove heat from exhaust gasses that pass through it.

EGR Outlet Manifold

The EGR outlet manifold connects the EGR cooler to the EGR mixing duct where it is mixed with the
cooled, charge air exiting the CAC.

EGR Mixing Duct

Located on the front of the engine, the EGR mixing duct contains the Charge Air Cooler Outlet
Temperature, or CACOT, sensor and Intake Manifold Pressure, or IMP, sensor.

Exhaust Manifold

TO PREVENT PROPERTY OR COMPONENT DAMAGE, NEVER SEPARATE THE FRONT OR REAR

SECTIONS OF THE EXHAUST MANIFOLD FROM THE CENTER SECTION ON THE 2017 INTERNATIONAL
A26 ENGINE. NEVER INSTALL AN EXHAUST MANIFOLD THAT HAS BEEN PREVIOUSLY DISMANTLED.

A three-piece exhaust manifold is mounted to the right side of the cylinder head, and routes exhaust
gasses to the exhaust inlet of the VGT.

EBP Sensor

The Exhaust Back Pressure, or EBP, sensor is threaded into a tube mounted to the center section of the
exhaust manifold. The EBP sensor measures exhaust backpressure in the manifold before the VGT.

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9 2017 International® A26 Engine Overview ● Study Guide

EET Sensor

The Engine Exhaust Temperature, or EET, sensor is threaded into the center section of the exhaust
manifold.

Exhaust Manifold Flow

A portion of exhaust gasses are also routed to the EGR cooler from the exhaust manifold.

Notes

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 2017 International® A26 Engine Overview ● Study Guide 10

Module 3: Cooling Management System

Base Engine Flow
Water Distribution Housing

The water distribution housing is mounted to the front of the 2017 International® A26 engine. The water
distribution housing contains the water pump and directs coolant to the engine, cylinder head, and
radiator.

Water Pump

The water pump is mounted to the water distribution housing, and circulates coolant throughout engine
components.

Thermostat Housing

Dual thermostats are located in the thermostat housing.

ECT Sensor

The Engine Coolant Temperature, or ECT, sensor is mounted in the EGR coolant return manifold.

Below Operating Temperature

When the coolant temperature is below operating temperature, the thermostats direct coolant back to
the water pump to be recirculated through the engine. Regardless of coolant temperature, a small
amount of coolant will still flow through the ball valve orifice of each thermostat.

THE THERMOSTATS SHOULD BE CLOCKED WITH THE BALL VALVES AT THE 12 O'CLOCK POSITION.

Flow through Cylinder Head and Crankcase

Coolant is directed to the cylinder head and crankcase through passages in the water distribution
housing. This coolant flows through the cylinder head and crankcase from front to rear in parallel paths.
Coolant exiting the crankcase and cylinder head at the rear of the engine flows through the externally
mounted rear coolant manifold.

Rear Coolant Manifold Flow

The rear coolant manifold directs coolant to the EGR coolant supply tube, the Aftertreatment
Hydrocarbon Doser, or AFTHD, and the Diesel Exhaust Fluid, or DEF, supply system.

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11 2017 International® A26 Engine Overview ● Study Guide

Heater Return Tube

The heater return tube, mounted to the right side of the engine, has multiple ports where coolant is
returned from various components to the water distribution housing.

Flow to Radiator

When the coolant temperature is at or above operating temperature, the thermostats will open,
directing coolant through the coolant outlet manifold to the radiator.

Engine Fan

A six blade engine fan is belt driven off the engine, and is controlled by a fan clutch. The engine fan pulls
air across the radiator fins.

Flow Back to Water Distribution Housing

After passing through the radiator, coolant is then routed back to the water distribution housing.

EGR System Flow

Flow to EGR Cooler

From the rear coolant manifold, the EGR coolant supply tube routes coolant to the EGR cooler. An outlet
port on the EGR cooler inlet elbow supplies coolant to the cab and bunk heater cores. Coolant exiting
the cab and bunk heater cores returns to the heater return tube.

After passing through the EGR cooler, the coolant flows into the thermostat housing through the EGR
coolant return manifold.

EGR Valve Flow

Coolant flows to the EGR valve from an elbow located on the top rear of the EGR cooler. Coolant exiting
the EGR valve is channeled through a steel line to the heater return pipe.

AFTHD Coolant Flow

From the rear coolant manifold, a coolant line supplies coolant to the AFTHD. The AFTHD coolant return
line connects with the heater return tube.

Deaeration Tank Flow

A deaeration tank is mounted to the cooling package to eliminate air from the cooling system.

A hose connects the vent fitting on the EGR cooler to the deaeration tank, allowing air bubbles to escape
the EGR cooler.

A return hose routes coolant from the deaeration tank back to the water distribution housing where it is
recirculated through the engine.
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 2017 International® A26 Engine Overview ● Study Guide 12

Notes

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13 2017 International® A26 Engine Overview ● Study Guide

Module 4: Fuel Delivery System

TO PREVENT PROPERTY DAMAGE, PERSONAL INJURY, AND/OR DEATH, NEVER LOOSEN A HIGH-
PRESSURE FUEL LINE OR OTHER COMMON RAIL COMPONENT WHILE THE ENGINE IS RUNNING, OR
WHEN THE ENGINE IS OFF WITHOUT FIRST CHECKING THAT RAIL PRESSURE IS AT A SAFE PRESSURE
USING AN ELECTRONIC SERVICE TOOL, OR EST. COMMON RAIL LINES AND COMPONENTS CONTAIN
FUEL UNDER EXTREMELY HIGH PRESSURES. HIGH PRESSURE FUEL MAY PENETRATE THE SKIN AND
CAUSE INJURY OR DEATH.

Base Engine Fuel Flow

Flow to Primary Fuel Filter

THERE ARE VARIOUS PRIMARY FUEL FILTER OPTIONS AVAILABLE ON THE 2017 INTERNATIONAL®
A26 ENGINE.

Fuel drawn from the fuel tank is routed to the primary fuel filter module.

Primary Fuel Filter

The primary fuel filter module is commonly mounted to the frame rail and filters debris from the fuel
exiting the fuel tank. From the primary fuel filter, fuel is routed to the primer pump.

Primer Pump

The primer pump is mounted to the Engine Control Module, or ECM, mounting bracket for unobstructed
access, and is used to prime the fuel system when required. The hand-operated primer pump on the
2017 International® A26 Engine displaces over two and a half times more fuel than previous designs.
From the primer pump, fuel is routed to the low-pressure fuel pump.

Low Pressure Fuel Pump

The low-pressure fuel pump is bolted to the back of the high-pressure fuel pump assembly on the left
side of the engine, and is driven off of the high-pressure fuel pump. When the engine is running, the low
pressure fuel pump draws fuel from the fuel tank. Fuel exiting the low pressure fuel pump is routed to
the secondary fuel filter module.

Secondary Fuel Filter Module

The secondary fuel filter module is mounted to the left side of the engine, and utilizes a 5 micron filter
to remove debris from the fuel. A serviceable fuel filter element is accessed by removing the cap.

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 2017 International® A26 Engine Overview ● Study Guide 14

Fuel Delivery Pressure Sensor

2017 INTERNATIONAL® A26 ENGINES BUILT AFTER NOVEMBER 2017 WILL NOT UTILIZE A FUEL
DELIVERY PRESSURE (FPD) SENSOR.

The Fuel Delivery Pressure, or FDP, sensor monitors the pressure of the fuel that enters the secondary
fuel filter module.

Tee Fitting

From the secondary fuel filter module, fuel is routed to a tee fitting. The tee fitting routes fuel to the
aftertreatment fuel supply module and the high pressure fuel pump. The high pressure fuel pump supply
line contains an in-line orifice. This orifice reduces the pressure of fuel being supplied to the high
pressure fuel pump.

High Pressure Fuel Pump

THE HIGH PRESSURE FUEL PUMP IS NOT BACKWARD COMPATIBLE WITH PREVIOUS ENGINE
DESIGNS.

The High Pressure Fuel Pump, or HPFP, is mounted to the left side of the engine and is driven off the
front gear train. The HPFP is capable of increasing the fuel pressure up to 2,500 bar, or 36,000 pounds
per square inch.

Engine Fuel Actuator 1

The Engine Fuel Actuator 1, or EFA1, valve regulates fuel entering the high-pressure pumping chambers.
Excess fuel not entering the chambers is used to lubricate and cool the pump before being routed back
to the fuel tank. The EFA1 valve is located on the high pressure fuel pump.

High Pressure Fuel Flow

Two high-pressure fuel supply lines route fuel from the high pressure fuel pump to the fuel rail.
Mounted to the left side of the engine, the fuel rail distributes high pressure fuel to the fuel pressure
pipes through the high pressure fuel lines.

Mounted to the front of the fuel rail, the Engine Fuel Rail Pressure, or EFRP, sensor monitors fuel rail
pressure. The fuel pressure pipes and high pressure fuel lines are one-time use only.

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15 2017 International® A26 Engine Overview ● Study Guide

Aftertreatment System Fuel Flow

From the tee fitting, fuel is also sent to the aftertreatment fuel supply module.

Aftertreatment Hydrocarbon Doser

The aftertreatment fuel supply module regulates the flow of fuel and air being sent to the
aftertreatment hydrocarbon doser. The Aftertreatment Hydrocarbon Doser, or AFTHD, injects fuel into
the exhaust stream entering the aftertreatment system.

AFTFP Sensor

The pressure of the fuel entering the aftertreatment fuel supply module is monitored by the
Aftertreatment Fuel Pressure, or AFTFP, sensor.

AFTFEA

The Aftertreatment Fuel Enable Actuator, or AFTFEA, regulates fuel being sent to the aftertreatment
hydrocarbon doser.

Aftertreatment Purge Air Actuator

The Aftertreatment Purge Air Actuator, or AFTPAA, is located on the left side of the engine. The AFTPAA
injects air through the aftertreatment hydrocarbon doser. The aftertreatment purge air actuator will
inject air at the end of the dosing cycle to prevent coking on the tip of the doser.

Cold Start Fuel Injector Fuel Flow

If the engine is equipped with a cold start fuel ignitor system, the secondary fuel filter module will
supply fuel to the Cold Start Fuel Injector, or CSFI, solenoid through steel fuel lines. From the CSFI
solenoid a braided fuel line supplies fuel to the CSFI.

Notes

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 2017 International® A26 Engine Overview ● Study Guide 16

Module 5: Lubrication System

Base Engine Oil Flow
Engine oil is drawn from the oil pan, which is mounted to the bottom of the crankcase.

Engine Oil Level Sensor

The Engine Oil Level, or EOL, sensor is an optional sensor that is installed on the lower left side of the
crankcase. This sensor measures both level and temperature of the oil in the oil pan.

Pickup Tube

Oil is drawn from the oil pan by the oil pump through a pickup tube.

Oil Pump

The gerotor-style oil pump is mounted behind the front cover and is gear driven by the crankshaft gear.
Oil is routed to the oil module by the oil pump. A pressure regulator in the oil filter module routes
excess oil back to the oil pan.

Oil Module

The oil module is mounted to the right side of the 2017 International® A26 Engine, and contains a
canister-style filter, oil cooler, engine oil pressure sensor, engine oil temperature sensor, pressure relief
valve, oil filter bypass valve, and an anti-drain-back valve.

Engine Oil Pressure Sensor

The Engine Oil Pressure, or EOP, sensor is threaded into the oil filter module, just below the cartridge
housing. The EOP sensor measures engine oil system pressure.

Oil Cooler

The oil cooler on the 2017 International® A26 engine utilizes a thermostat-regulated bypass. This
thermostat regulated bypass aids in cold weather engine performance by bypassing the oil cooler when
engine oil temperature is low.

Crankcase Breather Oil Separator

The Crankcase Breather Oil Separator, or CCBOS, contains an internal element, driven by oil pressure,
causing it to rotate at high speeds.

The CCBOS element separates the oil mist from the crankcase gases. Oil drains to the crankcase, and the
gases exit the breather tube.

The Crankcase Breather Oil Separator Speed, or CCBOSS, sensor monitors the speed of the spinning
element.

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17 2017 International® A26 Engine Overview ● Study Guide

Engine Oil Temperature Sensor

The Engine Oil Temperature, or EOT, sensor is located on the oil module flange, and measures the
temperature of the oil entering the cylinder head.

Oil Flow

Inside the cylinder head, oil flows through drilled passages to lubricate the valve train components and
camshaft gear. Pressurized oil is also directed to the engine brake assemblies.

VGT Oil Flow

From the oil module, filtered oil also enters the crankcase passages and lubricates various engine
components.

A supply line routes oil from the oil filter module to the VGT which lubricates and cools the turbine
shaft. Oil supplied to the VGT then drains back to the crankcase via the turbocharger oil drain tube.

Notes

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 2017 International® A26 Engine Overview ● Study Guide 18

Module 6: Gear Train

Components of the gear train on the 2017 International® A26 engine have been manufactured using a
grinding process for smoother surfaces and quieter operation.

Front Gear Train

The front gear train consists of the crankshaft drive gear, oil pump outer rotor, front idler gear, high
pressure fuel pump gear, and the accessory drive gear.

Rear Gear Train

AN OPTIONAL POWER TAKE OFF, OR PTO, GEAR MAY BE INSTALLED IN THE REAR GEAR TRAIN.

The rear gear train consists of the rear crankshaft gear, air compressor idler gear, large idler gear,
crankcase idler gear, cylinder head idler gear, and camshaft gear.

Notes

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19 2017 International® A26 Engine Overview ● Study Guide

Module 7: Electrical Control

Engine Control Module

THE ENGINE CONTROL MODULE USED ON THE 2017 INTERNATIONAL® A26 ENGINE MAY BE
REFERRED TO AS THE MX-1 ENGINE CONTROL MODULE.

The 2017 International® A26 engine utilizes an Engine Control Module, or ECM, which is mounted on the
upper left front of the engine, and monitors both the engine and aftertreatment systems.

Engine Harness

The foam encapsulated engine harness includes molded-in mounting brackets. This harness connects
various engine mounted components to the ECM.

Injector Harness

A separate injector harness connects the injectors and Engine Compression Brake, or ECB, solenoids to
the ECM.

Notes

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 2017 International® A26 Engine Overview ● Study Guide 20

Conclusion
This concludes the Navistar® training course: 2017 International® A26 Engine Overview

Thank you for your participation.

Notes

2017 International® A26 Engine Overview • © 2017 Navistar®, Inc. All rights reserved. All marks are trademarks of their respective owners.