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Service Information
Document Title: Function Group: Information Type: Date:
Engine, description 200 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Engine, description
Volvo D7D
The engine is a 6-cylinder, 4-stroke, direct injected, turbocharged, air to air aftercooled, water cooled assembly with a cast
iron block and cylinder head.
This is a heavy duty diesel engines with a low swirl combustion process and a high pressure injection system with individual
pumps.
Figure 1
Engine, start motor side view
1.
2.
3.
4.
5.
6.
7.
8.
9.
Air conditioner compressor pulley
Engine oil pressure sensor port
Make up line
Coolant temperature sensor port
Water inlet
Lifting lug
Water outlet
Air inlet
Start motor
Figure 2
Engine, air heater side view
1.
2.
3.
4.
5.
Fuel return line
Air heater
Coolant preheater port
Coolant filter supply
Fuel suction line
Figure 3
Engine, top view
1.
2.
3.
4.
Water inlet
Return from heater
Engine oil filler
Supply to heater
5.
6.
7.
Oil dipstick
Air inlet
Water outlet
Figure 4
Engine, front view
1.
2.
3.
4.
Alternator
From charge air cooler
To charge air cooler
Oil drain valve
Figure 5
Engine, rear view
Volvo D7E
The engine is a 6-cylinder, 4-stroke, direct injected, turbocharged, air to air aftercooled, water cooled assembly with a cast
iron block and cylinder head.
This is a heavy duty diesel engines with a low swirl combustion process and a high pressure injection system with individual
pumps.
Figure 6
Engine view (D7E EAE3)
1 Engine oil filler 7 Coolant filter supply 13 Compressor
2 Supply to heater 8 Oil level sensor 14 Coolant temp port
3 Return grom heater (water inlet) 9 Oil drain valve 15 Engine oil pressure sensor port
4 Engine oil dipstick 10 Air vent connection 16 Start motor
5 Air heater 11 Alternator
6 Coolant preheater port 12 Fuel in suction port
Service Information
Document Title: Function Group: Information Type: Date:
Engine characteristic curve 210 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Engine characteristic curve
Item Specifications
Rated output (Net) 143 kW (195 PS / 192 HP) at1800 rpm
Maximum torque (Net) 965 N m ( 98 kgf m/ / 714 lbf ft) at 1350 rpm)
236 g / kW·h at 1800 rpm
Fuel consumption
238 g / kW·h at 1350 rpm
Figure 1
Engine, characteristic curve
A be (g/kW/h) : Fuel consumption C rpm : Engine speed
B T (N m) : Torque D P (kW) : Power
Service Information
Document Title: Function Group: Information Type: Date:
Basic check, Engine 210 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Basic check, Engine
NOTE!
Certain tests and checks are performed with unlocked safety locking lever. Make sure that the machine cannot operate
unexpectedly when the safety locking lever is unlocked.
Purpose of the basic check
The purpose of the basic check is to provide fast and accurate information about the general condition of the engine.
The basic check should be performed and evaluated according to instructions in the PC-tool VCADS Pro.
Tests included in the basic check
The basic check which is divided into the following tests should be performed after reading out error codes and checking
parameters.
Tests:
1.
2.
3.
4.
Cylinder compression, test
The purpose of the test is to show if any cylinder has a deviating compression pressure. The test replaces the old
pressure check method but does not give any absolute values.
Cylinder balancing, test
The purpose of the test is to show if there is any deviation in the fuel injection to a cylinder.
Feed pressure, test
The purpose of the test is to check that the feed pressure is as per specification.
Sensor, test
The purpose of the test is to check the function of all sensors.
Service Information
Document Title: Function Group: Information Type: Date:
Troubleshooting 210 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Troubleshooting
General about troubleshooting
When a malfunction is suspected or has been confirmed, it is important to identify the cause as soon as possible.
The starting point for all troubleshooting is that there is some type of trouble symptom or malfunction.
Malfunctions can be indicated by:


generation of error codes
detection of a malfunction symptom.
Troubleshooting work
The first step in troubleshooting is to gather information from the operator concerning the malfunction symptoms, see
Electrical and information system, Collection of basic data. Then, attempt to pin-point the cause by checking in a certain
order, for more information, see Electrical and information system, troubleshooting strategy.
The different checking steps are:



Check error codes
Check parameters
Perform basic check
Troubleshooting information
The following is included in Electrical and information system and is used when troubleshooting:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Troubleshooting strategy
Describes troubleshooting work, step by step.
Troubleshooting, assistive devices
Brief summary of the assistive devices that are available for troubleshooting.
Functional checks and tests, VCADS Pro
Brief description of VCADS Pro. For a detailed description, see VCADS Pro User’s Manual.
Error code information
Contains information regarding error code design, lists of all error codes and error code information about each
error code.
Components, troubleshooting and specifications
Contains methods and measuring values for troubleshooting of components. Also includes wiring diagrams and
certain specifications.
Parameters
Incorrectly set parameters may cause malfunction symptoms. The parameter list includes all limit and command
values for parameters.
Control units, functional description
Describes the functions of the control units, inputs and outputs as well as communication between the various
control units.
Control units, active and passive measuring
Contains measuring values for active and passive measuring of the ECUs.
Software functions
Describes the pre-requisite conditions for the control and monitoring functions that are performed by the software
in the ECUs.
Service Information
Document Title: Function Group: Information Type: Date:
Cylinder head, description 211 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Cylinder head, description
The cylinder head is made of grey cast iron and is common for all cylinders. The induction air enters vertically (A) and the
exhausts leave horizontally (B). Inlets and exhaust outlets are located on the same side of the cylinder block. Inlet and
exhaust valve size is increased to optimize the gas exchange and combustion process. Valve guides are replaceable. Coolant
flow in the cylinder head is modified to accommodate an outlet controlled cooling system.
On order for the engine to fulfill governing emission standards, there are 3 cylinder head gaskets of different thicknesses
between the cylinder head and the piston.
Figure 1
Service Information
Document Title: Function Group: Information Type: Date:
Cylinder head gasket,
description
211 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Cylinder head gasket, description
The cylinder head gasket is a multi layered gasket with 1, 2 or 3 identification holes to indicate three different thicknesses
available. Selection of the proper thickness of gasket is determined by the measurement of piston projection above the
cylinder block sealing surface. Recalibration for the correct gasket thickness would be required if new pistons or a new
cylinder block were installed.
Figure 1
1. Cylinder head gasket, marking
Service Information
Document Title: Function Group: Information Type: Date:
Cylinder liner, description 213 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Cylinder liner, description
The engine has a cylinder block with wet (replaceable) cylinder liners. The bottom part of the liner is sealed against the
cylinder block with two O-rings positioned in grooves machined into the lower end of the liner.
The upper part of the cylinder liner is sealed by the cylinder head gasket and the pressure created by the cylinder head
clamping force against liner protrusion.
Figure 1
Cylinder liner
Service Information
Document Title: Function Group: Information Type: Date:
Pistons, description 213 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Pistons, description
The pistons of the engine are made of special alloy aluminium.
The top of the piston has a combustion cavity and a flywheel symbol to indicate the correct piston orientation.
Piston cooling is by oil spray to the inside of the piston from nozzles located in the main bearing pedestals.
The pistons are provided with three piston rings, two compression rings and one oil control ring.
The first or top compression ring has a cast iron carrier. The cross-section area for the second compression ring is tapered.
The third ring is an oil ring with a bevelled edge.
When installing the piston rings, the marking TOP by the opening in the rings must be face up.
Figure 1
1.
2.
Flywheel symbol
Iron carrier
Service Information
Document Title: Function Group: Information Type: Date:
Piston rings, description 213 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Piston rings, description
Each piston is equipped with two compression rings and one oil ring. The uppermost compression ring is of the "Keystone"
type (dual trapezoid-formed cross section). Compressions rings should be placed with the text facing upwards.
The oil ring is equipped with two scraping edges, which are pressed against the cylinder wall using the spring tension in the
ring and an expander spring placed on the inside of the ring. The oil ring can be placed on either side but should be placed
with expander spring and oil ring openings 180° from one another.
Figure 1
Service Information
Document Title: Function Group: Information Type: Date:
Piston cooling 213 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Piston cooling
Figure 1
Piston cooling
The piston is cooled by spraying lube oil against the inside of the piston top.
The 2-hole piston cooling nozzles made of plastic are fitted in the main bearing pedestals.
Service Information
Document Title: Function Group: Information Type: Date:
Valves, description 214 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Valves, description
The engines are equipped with one inlet and one exhaust valve per cylinder.
At the upper end of the valve guide, there is an O-ring seal (A) against the valve spindle to prevent major oil consumption
and to reduce the amount of hydrocarbons in the exhausts.
The valves are rotated by the eccentric action of the rocker arms.
The new compressed tapered shape enables the valves to turn easily despite loading.
Rocker arm lubrication is part of the engine force-feed lubrication system. The oil is supplied via the tappets and push rods.
If the valve guides are replaced, they are obtained in another version (B) to facilitate installation.
Figure 1 shows a valve guide installed in production and figure 2 shows a replacement guide.
Figure 1
Service Information
Document Title: Function Group: Information Type: Date:
Internal Exhaust Gas
Recirculation (IEGR),
description
214 Service Information 2014/4/13
Profile:
EXC, EC290B NLC [GB]
Internal Exhaust Gas Recirculation (IEGR), description
A system for IEGR (Internal Exhaust Gas Recirculation) is used as part of V-ACT (Volvo Advanced Combustion Technology).
On D6E and D7E this takes place by an IEGR-opening piston, controlled by the lubrication oil's system pressure, acting on
the exhaust rocker arm which enables a second opening of the exhaust valves. When activated, the secondary piston will
give a limited valve opening of the exhaust valves during the induction phase, which leads exhausts back into the cylinder.
Included components
IEGR-unit
The hydraulic mechanism is housed in two interconnected IEGR-units, located on the rocker arm holders. Lubrication oil is
routed from the cylinder head via the solenoid valve to the high-pressure channel in the IEGR-unit through a channel in one
of the rocker arm holders.
Figure 1
1. IEGR-unit
Solenoid valve
The solenoid valve is located in the cylinder head on the flywheel side and is activated by the EECU via the control system
EMS 2. When IEGR is not activated, the solenoid valve is closed and no oil flow is allowed into the IEGR-unit. At activation of
IEGR, the solenoid valve opens the channel from the engine's lubrication system to the IEGR-unit.
Figure 2
1. Solenoid valve
Control valve
The control valve is located in the IEGR-unit between the high-pressure circuit and low-pressure circuit. When the low-
pressure circuit is supplied from the lubrication oil system, the control valve is lifted and closes the high-pressure circuit. The
ball in the control valve enables filling of the high-pressure circuit when IEGR is activated.
The lubrication oil is drained through the control valve.
Figure 3
1. Control valve
Main piston
The main piston is acted on by the adjusting screw on the inlet valve's rocker arm, and affects the oil pressure in the IEGR-
unit's high-pressure channel. At the end of the IEGR-phase, a pressure of 100 bar is generated in the high-pressure circuit.
Figure 4
1. Main piston
Servo piston
The servo piston is activated by the hydraulic pressure from the main piston via a channel in the IEGR-unit when the IEGR-
function is active/on (solenoid valve in open position). Then the servo piston opens the exhaust valves via the rocker arm an
extra time during the induction stroke.
Figure 5
1. Servo piston
Function
IEGR is activated by the system being supplied with full lubrication oil system pressure via the solenoid valve. The solenoid
valve is activated by the E-ECU.
The control valve closes the high-pressure circuit and the ball inside the valve enables filling of the system.
With the same movement as the inlet valve's rocker arm opens the valve, the main piston is forced upward. The pressure in
the IEGR-unit's high-pressure channel (up to 100 bar) overcomes the spring force in the servo piston. the servo piston forces
down the rocker arm, which results in the exhaust valve being open for a short time at the end of the induction stroke.
Exhausts from the exhaust manifold are sucked into the cylinder by vacuum from the other cylinders.
The breather hole between the low-pressure channel and the high-pressure channel in the IEGR-unit enables longer exhaust
recirculation at high engine speed.
Figure 6
IEGR-system (inactive)
1.
2.
3.
4.
5.
6.
Servo piston
Control valve
Solenoid valve
2–5 Bar lubrication oil pressure
Breather hole
Oil channel, low-pressure
Suggest:
If the above button click is invalid.
Please download this document
first, and then click the above link
to download the complete manual.
Thank you so much for reading
7.
8.
9.
10.
Oil channel, high-pressure
Main piston
Induction rocker arm
Exhaust rocker arm
Figure 7
IEGR-system activated
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Servo piston
Control valve
Solenoid valve
2–5 Bar lubrication oil pressure
Breather hole
Oil channel, low-pressure
Oil channel, high-pressure
Main piston
Induction rocker arm
Exhaust rocker arm
Checking and adjusting
Checking and adjusting of the IEGR-opening piston's clearance against the exhaust rocker arm should be done in
connection with checking and adjusting valves according to .
214 Valves, adjusting
Software
The function monitors the EGR valve for return of combustion gases and informs the operator if the function is not ensured
or if there is a system malfunction.
The function is also used as input signal for Engine protection.

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  • 1. Service Information Document Title: Function Group: Information Type: Date: Engine, description 200 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Engine, description Volvo D7D The engine is a 6-cylinder, 4-stroke, direct injected, turbocharged, air to air aftercooled, water cooled assembly with a cast iron block and cylinder head. This is a heavy duty diesel engines with a low swirl combustion process and a high pressure injection system with individual pumps. Figure 1 Engine, start motor side view 1. 2. 3. 4. 5. 6. 7. 8. 9. Air conditioner compressor pulley Engine oil pressure sensor port Make up line Coolant temperature sensor port Water inlet Lifting lug Water outlet Air inlet Start motor
  • 2. Figure 2 Engine, air heater side view 1. 2. 3. 4. 5. Fuel return line Air heater Coolant preheater port Coolant filter supply Fuel suction line Figure 3 Engine, top view 1. 2. 3. 4. Water inlet Return from heater Engine oil filler Supply to heater
  • 3. 5. 6. 7. Oil dipstick Air inlet Water outlet Figure 4 Engine, front view 1. 2. 3. 4. Alternator From charge air cooler To charge air cooler Oil drain valve
  • 4. Figure 5 Engine, rear view Volvo D7E The engine is a 6-cylinder, 4-stroke, direct injected, turbocharged, air to air aftercooled, water cooled assembly with a cast iron block and cylinder head. This is a heavy duty diesel engines with a low swirl combustion process and a high pressure injection system with individual pumps.
  • 5. Figure 6 Engine view (D7E EAE3) 1 Engine oil filler 7 Coolant filter supply 13 Compressor 2 Supply to heater 8 Oil level sensor 14 Coolant temp port 3 Return grom heater (water inlet) 9 Oil drain valve 15 Engine oil pressure sensor port 4 Engine oil dipstick 10 Air vent connection 16 Start motor 5 Air heater 11 Alternator 6 Coolant preheater port 12 Fuel in suction port
  • 6. Service Information Document Title: Function Group: Information Type: Date: Engine characteristic curve 210 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Engine characteristic curve Item Specifications Rated output (Net) 143 kW (195 PS / 192 HP) at1800 rpm Maximum torque (Net) 965 N m ( 98 kgf m/ / 714 lbf ft) at 1350 rpm) 236 g / kW·h at 1800 rpm Fuel consumption 238 g / kW·h at 1350 rpm Figure 1 Engine, characteristic curve A be (g/kW/h) : Fuel consumption C rpm : Engine speed B T (N m) : Torque D P (kW) : Power
  • 7. Service Information Document Title: Function Group: Information Type: Date: Basic check, Engine 210 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Basic check, Engine NOTE! Certain tests and checks are performed with unlocked safety locking lever. Make sure that the machine cannot operate unexpectedly when the safety locking lever is unlocked. Purpose of the basic check The purpose of the basic check is to provide fast and accurate information about the general condition of the engine. The basic check should be performed and evaluated according to instructions in the PC-tool VCADS Pro. Tests included in the basic check The basic check which is divided into the following tests should be performed after reading out error codes and checking parameters. Tests: 1. 2. 3. 4. Cylinder compression, test The purpose of the test is to show if any cylinder has a deviating compression pressure. The test replaces the old pressure check method but does not give any absolute values. Cylinder balancing, test The purpose of the test is to show if there is any deviation in the fuel injection to a cylinder. Feed pressure, test The purpose of the test is to check that the feed pressure is as per specification. Sensor, test The purpose of the test is to check the function of all sensors.
  • 8. Service Information Document Title: Function Group: Information Type: Date: Troubleshooting 210 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Troubleshooting General about troubleshooting When a malfunction is suspected or has been confirmed, it is important to identify the cause as soon as possible. The starting point for all troubleshooting is that there is some type of trouble symptom or malfunction. Malfunctions can be indicated by:   generation of error codes detection of a malfunction symptom. Troubleshooting work The first step in troubleshooting is to gather information from the operator concerning the malfunction symptoms, see Electrical and information system, Collection of basic data. Then, attempt to pin-point the cause by checking in a certain order, for more information, see Electrical and information system, troubleshooting strategy. The different checking steps are:    Check error codes Check parameters Perform basic check Troubleshooting information The following is included in Electrical and information system and is used when troubleshooting: 1. 2. 3. 4. 5. 6. 7. 8. 9. Troubleshooting strategy Describes troubleshooting work, step by step. Troubleshooting, assistive devices Brief summary of the assistive devices that are available for troubleshooting. Functional checks and tests, VCADS Pro Brief description of VCADS Pro. For a detailed description, see VCADS Pro User’s Manual. Error code information Contains information regarding error code design, lists of all error codes and error code information about each error code. Components, troubleshooting and specifications Contains methods and measuring values for troubleshooting of components. Also includes wiring diagrams and certain specifications. Parameters Incorrectly set parameters may cause malfunction symptoms. The parameter list includes all limit and command values for parameters. Control units, functional description Describes the functions of the control units, inputs and outputs as well as communication between the various control units. Control units, active and passive measuring Contains measuring values for active and passive measuring of the ECUs. Software functions Describes the pre-requisite conditions for the control and monitoring functions that are performed by the software in the ECUs.
  • 9. Service Information Document Title: Function Group: Information Type: Date: Cylinder head, description 211 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Cylinder head, description The cylinder head is made of grey cast iron and is common for all cylinders. The induction air enters vertically (A) and the exhausts leave horizontally (B). Inlets and exhaust outlets are located on the same side of the cylinder block. Inlet and exhaust valve size is increased to optimize the gas exchange and combustion process. Valve guides are replaceable. Coolant flow in the cylinder head is modified to accommodate an outlet controlled cooling system. On order for the engine to fulfill governing emission standards, there are 3 cylinder head gaskets of different thicknesses between the cylinder head and the piston. Figure 1
  • 10. Service Information Document Title: Function Group: Information Type: Date: Cylinder head gasket, description 211 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Cylinder head gasket, description The cylinder head gasket is a multi layered gasket with 1, 2 or 3 identification holes to indicate three different thicknesses available. Selection of the proper thickness of gasket is determined by the measurement of piston projection above the cylinder block sealing surface. Recalibration for the correct gasket thickness would be required if new pistons or a new cylinder block were installed. Figure 1 1. Cylinder head gasket, marking
  • 11. Service Information Document Title: Function Group: Information Type: Date: Cylinder liner, description 213 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Cylinder liner, description The engine has a cylinder block with wet (replaceable) cylinder liners. The bottom part of the liner is sealed against the cylinder block with two O-rings positioned in grooves machined into the lower end of the liner. The upper part of the cylinder liner is sealed by the cylinder head gasket and the pressure created by the cylinder head clamping force against liner protrusion. Figure 1 Cylinder liner
  • 12. Service Information Document Title: Function Group: Information Type: Date: Pistons, description 213 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Pistons, description The pistons of the engine are made of special alloy aluminium. The top of the piston has a combustion cavity and a flywheel symbol to indicate the correct piston orientation. Piston cooling is by oil spray to the inside of the piston from nozzles located in the main bearing pedestals. The pistons are provided with three piston rings, two compression rings and one oil control ring. The first or top compression ring has a cast iron carrier. The cross-section area for the second compression ring is tapered. The third ring is an oil ring with a bevelled edge. When installing the piston rings, the marking TOP by the opening in the rings must be face up. Figure 1 1. 2. Flywheel symbol Iron carrier
  • 13. Service Information Document Title: Function Group: Information Type: Date: Piston rings, description 213 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Piston rings, description Each piston is equipped with two compression rings and one oil ring. The uppermost compression ring is of the "Keystone" type (dual trapezoid-formed cross section). Compressions rings should be placed with the text facing upwards. The oil ring is equipped with two scraping edges, which are pressed against the cylinder wall using the spring tension in the ring and an expander spring placed on the inside of the ring. The oil ring can be placed on either side but should be placed with expander spring and oil ring openings 180° from one another. Figure 1
  • 14. Service Information Document Title: Function Group: Information Type: Date: Piston cooling 213 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Piston cooling Figure 1 Piston cooling The piston is cooled by spraying lube oil against the inside of the piston top. The 2-hole piston cooling nozzles made of plastic are fitted in the main bearing pedestals.
  • 15. Service Information Document Title: Function Group: Information Type: Date: Valves, description 214 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Valves, description The engines are equipped with one inlet and one exhaust valve per cylinder. At the upper end of the valve guide, there is an O-ring seal (A) against the valve spindle to prevent major oil consumption and to reduce the amount of hydrocarbons in the exhausts. The valves are rotated by the eccentric action of the rocker arms. The new compressed tapered shape enables the valves to turn easily despite loading. Rocker arm lubrication is part of the engine force-feed lubrication system. The oil is supplied via the tappets and push rods. If the valve guides are replaced, they are obtained in another version (B) to facilitate installation. Figure 1 shows a valve guide installed in production and figure 2 shows a replacement guide. Figure 1
  • 16. Service Information Document Title: Function Group: Information Type: Date: Internal Exhaust Gas Recirculation (IEGR), description 214 Service Information 2014/4/13 Profile: EXC, EC290B NLC [GB] Internal Exhaust Gas Recirculation (IEGR), description A system for IEGR (Internal Exhaust Gas Recirculation) is used as part of V-ACT (Volvo Advanced Combustion Technology). On D6E and D7E this takes place by an IEGR-opening piston, controlled by the lubrication oil's system pressure, acting on the exhaust rocker arm which enables a second opening of the exhaust valves. When activated, the secondary piston will give a limited valve opening of the exhaust valves during the induction phase, which leads exhausts back into the cylinder. Included components IEGR-unit The hydraulic mechanism is housed in two interconnected IEGR-units, located on the rocker arm holders. Lubrication oil is routed from the cylinder head via the solenoid valve to the high-pressure channel in the IEGR-unit through a channel in one of the rocker arm holders. Figure 1 1. IEGR-unit Solenoid valve The solenoid valve is located in the cylinder head on the flywheel side and is activated by the EECU via the control system EMS 2. When IEGR is not activated, the solenoid valve is closed and no oil flow is allowed into the IEGR-unit. At activation of IEGR, the solenoid valve opens the channel from the engine's lubrication system to the IEGR-unit.
  • 17. Figure 2 1. Solenoid valve Control valve The control valve is located in the IEGR-unit between the high-pressure circuit and low-pressure circuit. When the low- pressure circuit is supplied from the lubrication oil system, the control valve is lifted and closes the high-pressure circuit. The ball in the control valve enables filling of the high-pressure circuit when IEGR is activated. The lubrication oil is drained through the control valve. Figure 3 1. Control valve Main piston The main piston is acted on by the adjusting screw on the inlet valve's rocker arm, and affects the oil pressure in the IEGR- unit's high-pressure channel. At the end of the IEGR-phase, a pressure of 100 bar is generated in the high-pressure circuit. Figure 4 1. Main piston Servo piston The servo piston is activated by the hydraulic pressure from the main piston via a channel in the IEGR-unit when the IEGR- function is active/on (solenoid valve in open position). Then the servo piston opens the exhaust valves via the rocker arm an extra time during the induction stroke.
  • 18. Figure 5 1. Servo piston Function IEGR is activated by the system being supplied with full lubrication oil system pressure via the solenoid valve. The solenoid valve is activated by the E-ECU. The control valve closes the high-pressure circuit and the ball inside the valve enables filling of the system. With the same movement as the inlet valve's rocker arm opens the valve, the main piston is forced upward. The pressure in the IEGR-unit's high-pressure channel (up to 100 bar) overcomes the spring force in the servo piston. the servo piston forces down the rocker arm, which results in the exhaust valve being open for a short time at the end of the induction stroke. Exhausts from the exhaust manifold are sucked into the cylinder by vacuum from the other cylinders. The breather hole between the low-pressure channel and the high-pressure channel in the IEGR-unit enables longer exhaust recirculation at high engine speed. Figure 6 IEGR-system (inactive) 1. 2. 3. 4. 5. 6. Servo piston Control valve Solenoid valve 2–5 Bar lubrication oil pressure Breather hole Oil channel, low-pressure
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  • 20. 7. 8. 9. 10. Oil channel, high-pressure Main piston Induction rocker arm Exhaust rocker arm Figure 7 IEGR-system activated 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Servo piston Control valve Solenoid valve 2–5 Bar lubrication oil pressure Breather hole Oil channel, low-pressure Oil channel, high-pressure Main piston Induction rocker arm Exhaust rocker arm Checking and adjusting Checking and adjusting of the IEGR-opening piston's clearance against the exhaust rocker arm should be done in connection with checking and adjusting valves according to . 214 Valves, adjusting Software The function monitors the EGR valve for return of combustion gases and informs the operator if the function is not ensured or if there is a system malfunction. The function is also used as input signal for Engine protection.