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1. SPECIFICATION
Description Specification
Fuel Diesel
Fuel filterTypeFuel heater + priming pump + water separator
integrated type
Filter type Changeable filter element type
every 40,000 km
every 45,000 km
Water accumulating capacity 200 cc
Heater capacity 250W 13.5V
Injector System pressure 1800 bar
High pressure fuel
pumpType Eccentric cam/Plunger type
Operating type Gear driven type
Normal operating temperature
Operating pressure 1800 bar
Operating temperature
Low pressure fuel
pumpType Vane type
Gear ratio (pump/engine) 0.5 : 1
Pressure 6 bar
Fuel tankCapacity 57 L
Material Plastic
Fuel sender Dual sender type
Change intervalEU
GEN
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Crankshaft position sensor
Measuring engine rpmT-MAP sensor
Measuring booster pressure
and temperatureHFM
Measuring intake air mass and
temperature
Engine ECU (D20DTF)
Engine control by various
signals
High pressure pump
Generates the high pressurized fuel
and supply it.
Plunger type HP pump (1,800
bar)
Vane type transfer pump (6bar)
Accelerator pedal
position sensor
Detects driver's intention for
speed up/downFuel filter assembly
Supply clean fuel/fuel
heating/water separation by
priming pump
Page 264 of 1336

1) Types of swirl
Swirl: One cylinder has two intake air ports, one is set horizontally
and the other one is set vertically. Swirl is the horizontal air flows in
cylinder due to the horizontal intake air ports.
Tumble: Tumble is the vertical air flows in cylinder due to the vertical
intake air port
Squish: Squish is the air flows due to the piston head. Normally, this
is appears at the final process of compression. In CRDi engine, the
piston head creates the bowl type squish.
2) Swirl control
In DI type diesel engine, the liquefied fuel is injected into the cylinder directly. If the fuel is evenly
distributed in short period, the combustion efficiency could be improved. To get this, there should be
good air flow in cylinder. In general, there are two intake ports, swirl port and tangential port, in each
cylinder. The swirl port generates the horizontal flow and the tangential port generates the longitudinal
flow. In low/mid load range, the tabgential port is closed to increase the horizontal flow. Fast flow
decreases the PM during combustion and increases the EGR ratio by better combustion efficiency.
Page 286 of 1336
Maximizes the intake air charging efficiency (Approx. 15%) -Optimizes the exhaust gas flow rate by controlling the vanes inside the turbine housing with the E-
Actuator. 1.
(2) E-Actuator (Electric-Actuator, Rotary type)
Target temperature and airflow control -Enhanced emission control: By temperature control with CDPF system 1.
(1) Performance (for EURO V)
Has a faster response time than the conventional vacuum actuator 2.
Improved low speed torque, high speed power and fuel economy.
Improved acceleration performance with rapid response time of vane -
-
1) Features
Features
BenefitsFolding and unfolding of the vane
is controlled electrically
Easy to get low speed air volume
Rapid response time
Electric control -
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Improved low speed torque
Improved low speed torque and
power
Reduced exhaust gas
Improved fuel consumption
Improved acceleration
performance -
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c. Types of swirl
Swirl: One cylinder has two intake air ports, one is set horizontally
and the other one is set vertically. Swirl is the horizontal air flows in
cylinder due to the horizontal intake air ports.
Tumble: Tumble is the vertical air flows in cylinder due to the vertical
intake air port
Squish: Squish is the air flows due to the piston head. Normally, this
is appears at the final process of compression. In CRDi engine, the
piston head creates the bowl type squish.
d. Swirl control
In DI type diesel engine, the liquefied fuel is injected into the cylinder directly. If the fuel is evenly
distributed in short period, the combustion efficiency could be improved. To get this, there should be
good air flow in cylinder. In general, there are two intake ports, swirl port and tangential port, in each
cylinder. The swirl port generates the horizontal flow and the tangential port generates the longitudinal
flow.
In low/mid load range, the tabgential port is closed to increase the horizontal flow. Fast flow decreases
the PM during combustion and increases the EGR ratio by better combustion efficiency.
Page 439 of 1336

3. GUIDELINES ON ENGINE SERVICE
G20DF engine is for FF (Front Engine Front Drive) type vehicle. Therefore, there are some deferent
maintenance and repair works compared to the engine for FR (Front Engine Rear Drive) type vehicle.
For safe and correct works, you must observe the working procedures and instructions in this manual.
And, use the designated tools as follow:
: Power train mounting stand / Engine hanger / Engine stand / Heavy duty engine jack.
Cautions before service works
G20DF engine is FF (Front Engine Front Drive) type engine, and the engine and transmission are
integrated in a same module. Remember that there are many differences compared to
conventional engine in FR (Front Engine Rear Drive) type SUV vehicle.
To remove the engine, use the dedicated equipments such as engine jack, transmission jack,
engine stand and engine crane (1 ton).
To prevent the engine from abruptly starting during service in engine compartment, never allow
anybody to stay in the vehicle.
Make sure to disconnect the negative (-) cable from the battery to prevent any damage to electric
systems.
Make sure to clean the working area and to prepare the necessary tools before service works.
Always place the ignition switch to OFF position if not required. Otherwise, there could be
unexpected damage to electric devices or personal injuries due to short-circuit..
To prevent the foreign material from entering into the fuel injection system, completely seal the
inlets of HP pump, fuel hoses and high pressure pipes.
Do not remove the engine while supporting the oil pan with a jack. -
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Lifting up the vehicle
Before lifting up the vehicle with a lift, correctly support the lifting points.
To prevent the vehicle from rolling down, put the chocks under the tires (when using a 4-post lift).
Make sure to support the correct lifting points (when using a 2-post lift). -
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Page 452 of 1336
1211-01
4) Intake/Exhaust Valve Assembly (Installed on Cylinder Head)
(1) Features
Automatic adustment of valve clearance by hydraulic pressure system (Maintenance Free)_Hydraulic
lash
Decreased valve operating noise
Decreased friction loss by introducing the roller type finger follower
Decreased running amount by compact design (increased valve following movement in high speed
and improved fuel economy by decreased friction loss) -
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(2) Layout and components
Intake camshaft assemblyExhaust camshaft assembly
Valve stem seal
Valve upper
spring seat
Valve guide
Hydraulic lash
adjuster
Exhaust valve assembly
Valve spring
Finger follower
Intake valve assembly
Page 480 of 1336
2221-01
1. SPECIFICATION
Unit Specification
Fuel systemFuel Unleaded gasoline
Fuel injection MPI (Muilt Point Injecter) type
Fuel supply Returnless Fuel System
Fuel tankCapacity 57 L
Material Plastic
Fuel sender Dual sender type
Fuel filter Service interval Change every 100,000 km
Fuel pump Pressure 3.8 bar
InjectorColor Black
Capacity 187.2 g/min