Isuzu 4EE2 Specifications
| Engine Model: Isuzu 4EE2 |
| Engine Type: 4-stroke in-line 4-cylinder liquid-cooled diesel |
| Total Displacement: 102.9 cu.in (1.68 L) |
| Rated Engine Power: 65-130 Hp (48-96 kW) at 4000-4400 rpm |
| Fuel System Type: Direct injection |
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The Isuzu 4EE2, widely known as the "Circle L"
engine, is a 1.7-liter inline-four turbocharged diesel engine developed
by Isuzu in collaboration with General Motors. Produced from 1998 to
approximately 2015, this engine represents a modern compact diesel
design for passenger vehicles and light commercial use. Unlike the
industrial engines previously discussed, the 4EE2 is an automotive
powerplant designed for European market vehicles, specifically for Opel,
Vauxhall, Chevrolet, and Honda.
The 4EE2 was manufactured at the Isuzu Motors Polska plant in Tychy,
Poland, later operated as GM Powertrain Poland. The engine evolved from
the earlier Isuzu 4EE1 1.7-liter diesel, receiving a new DOHC cylinder
head, 16-valve configuration, and direct injection technology. Early
versions used standard direct injection meeting Euro 3 emissions
standards, while later variants adopted common rail direct injection for
Euro 4 and Euro 5 compliance.
The engine is notable for being the first common rail diesel used by
Opel, marking a significant technological step for the manufacturer. The
4EE2 is recognized for its fuel economy and reduced emissions, leading
to its integration into the Opel Ecotec and later Ecoflex engine
families. A distinctive detail of the engine's production is that the
cylinder block was cast in Japan at Isuzu's Hokkaido factory, then
shipped to Poland for final assembly, where the valvetrain was
installed.
The Isuzu 4EE2 is a 4-stroke, compression-ignition, in-line 4-cylinder
diesel engine. The engine is turbocharged and intercooled on most
variants, though early low-power versions omitted the intercooler. Total
displacement measures 1,686 cc (102.9 cu.in). The bore and stroke
dimensions are 79.0 mm x 86.0 mm (3.11 in x 3.39 in). This long-stroke
configuration promotes low-speed torque, characteristic of diesel engine
design.
The compression ratio varies by emissions standard and power level:
18.4:1 for Euro 3 variants, 18.2:1 for certain Euro 4 variants, and
16.5:1 for higher-output versions. The firing order is 1-3-4-2, standard
for in-line 4-cylinder engines. Engine rotation, when viewed from the
flywheel end, is clockwise.
Maximum Power (Base 4EE2): 55 kW (74 hp) @ 4,400 rpm
Maximum Torque (Base 4EE2): 165 Nm (122 lb-ft) @ 1,800 rpm
Power (Y17DTL, non-intercooled): 48 kW (65 hp) @ 4,400 rpm
Power (Z17DT / Z17DTH): 75 kW (101 hp) @ 4,400 rpm
Torque (Z17DT): 240 Nm (177 lb-ft) @ 2,300 rpm
Torque (Z17DTH / A17DT): 260 Nm (192 lb-ft) @ 2,300 rpm
Power (Z17DTJ / Ecoflex): 81 kW (110 hp) @ 3,800 rpm
Power (A17DTS, High Output): 96 kW (130 hp) @ 4,000 rpm
Torque (A17DTS): 300 Nm (221 lb-ft) @ 2,000-2,500 rpm
Power (Z17DTR / A17DTR): 93 kW (125 hp) @ 4,000 rpm
Torque (Z17DTR): 280 Nm (207 lb-ft) @ 2,000-2,700 rpm
Rated Engine Speed: 4,400 rpm for most variants
Low Idle Speed: 750-850 rpm (ECU controlled)
Emissions Compliance: Euro 3, Euro 4, Euro 5
The cylinder block is constructed from cast iron, providing a rigid
foundation for the rotating assembly under high cylinder pressures
generated by turbocharging. The block architecture is a deep-skirt
design. The cylinders are integral to the block (parent bore) without
replaceable liners. A distinctive production feature of the 4EE2 is that
the cylinder blocks were cast at Isuzu's Hokkaido factory in Japan, then
shipped to the Tychy, Poland assembly plant. Approximately 60% of the
engine components, including the aluminum alloy for the cylinder head,
were sourced from German suppliers.
The crankshaft is forged steel, supported by five main bearings.
Connecting rods are forged steel, fracture-split at the cap for precise
registration. The pistons are cast aluminum alloy with high-ring groove
inserts. Each piston is fitted with three rings: two compression rings
(upper and intermediate) and one oil control ring. Piston cooling is
provided by oil spray jets (piston cooling nozzles) aimed at the
underside of each piston crown.
Number of Main Bearings: 5
Main Bearing Journal Diameter: 54.0 mm (2.13 in)
Connecting Rod Length (center-to-center): 138.0 mm (5.43 in)
Connecting Rod Big End Bore: 48.0 mm (1.89 in)
Piston Pin Diameter: 26.0 mm (1.02 in)
Piston Ring Width (top compression): 1.2 mm (0.047 in)
The cylinder head is a cross-flow, aluminum alloy casting spanning all 4
cylinders. The cross-flow design positions the intake manifold on one
side of the head and the exhaust manifold on the opposite side,
improving volumetric efficiency. The valvetrain utilizes a double
overhead camshaft (DOHC) arrangement, with one camshaft operating the
intake valves and a second operating the exhaust valves. The camshafts
are driven by a timing belt from the crankshaft sprocket. Camshafts run
directly in aluminum bearings machined into the head, with no
replaceable bearing shells on some variants.
Each cylinder has four valves: two intake and two exhaust (16 valves
total). The valves are arranged in a V-configuration within the pentroof
combustion chamber. The valves are actuated by inverted bucket tappets
(mechanical followers). Valve lash adjustment is mechanical, requiring
replacement of the tappets (selective fitting) as no threaded adjusters
are present. This design offers precise valve control at high engine
speeds and reduces maintenance frequency compared to shim-type systems.
Valve Arrangement: DOHC, cross-flow, 4 valves per cylinder
Intake Valve Diameter (each): 29.0 mm (1.14 in)
Exhaust Valve Diameter (each): 25.5 mm (1.00 in)
Valve Lift (intake and exhaust): 8.5 mm (0.335 in)
Valve Lash Adjustment: Mechanical bucket tappet
The fuel system evolved significantly during the 4EE2 production run.
Early variants (Y17DT, Y17DTL, Euro 3) use a standard direct injection
system with a distributor-type injection pump (Denso) operating at
pressures up to 600 bar (8,700 psi). Later variants (Z17DT, Z17DTH,
Z17DTR, A17DTS, and all common rail engines) use a high-pressure common
rail (HPCR) direct injection system. The common rail system was a major
technological advancement, being the first common rail diesel engine
used by Opel. The common rail system operates at pressures up to 1,600
bar (23,200 psi) on later variants.
A gear-type transfer pump draws fuel from the tank and supplies it to
the high-pressure pump. The high-pressure pump pressurizes fuel to the
common rail (accumulator) mounted on the engine. The rail distributes
pressurized fuel to each injector. Injectors are solenoid-actuated,
controlled by the Engine Control Unit (ECU) with pilot injection
capability.
Pilot injection delivers a small fuel quantity before the main injection
event, reducing combustion noise and NOx formation. The engine
management system is either Denso or Bosch, depending on the variant and
vehicle application. A fuel return line routes excess fuel and bleed air
back to the tank. The common rail variants are highly sensitive to fuel
contamination; regular fuel filter changes are critical to avoid
injector wear.
Injection Pressure (Euro 3, standard DI): 600 bar (8,700 psi) maximum.
Injection Pressure (common rail): 1,600 bar (23,200 psi) maximum.
Injector Type: Solenoid-actuated, common rail (Bosch or Denso).
Pilot Injection: One to three pre-injection events per cycle on common
rail variants.
Fuel Filtration: Single or dual spin-on filters with water separator.
Fuel Grade: EN 590 diesel (ultra-low sulfur, 15 ppm maximum).
Engine Control Unit (ECU): Denso (most variants) or Bosch (select
applications).
The lubrication system is a full-pressure, wet-sump design using a
gear-type oil pump. The oil pump is mounted inside the oil pan and
driven by the crankshaft. Oil is drawn from the sump through a wire mesh
strainer, pressurized by the pump, and then routed through a full-flow
oil filter (spin-on, synthetic media). The filter incorporates a bypass
valve to maintain oil flow if the filter becomes restricted. After
filtration, oil is distributed to the main bearings, connecting rod
bearings, camshaft bearings, and cylinder head. Piston cooling nozzles
receive oil from the main oil gallery.
The engine is equipped with an oil cooler (plate-and-fin type) mounted
on the cylinder block, using engine coolant as the cooling medium. A
crankcase ventilation system (closed type) routes blow-by gases through
an oil separator and back into the intake system.
Oil Capacity (with filter): 4.5 L (4.8 U.S. qt)
Oil Pressure (rated speed): 350-450 kPa (51-65 psi)
Oil Pressure (low idle, hot): 100 kPa (15 psi) minimum
Oil Viscosity: 5W-30 or 5W-40, fully synthetic (ACEA C3 or API CF)
Oil Specification: Dexos 2 certified for common rail variants
Oil Change Interval: 15,000-20,000 km (9,300-12,400 miles) or 12 months
Oil Pan Type: Stamped steel
The cooling system is a pressurized, liquid-cooled design with a
centrifugal water pump. The water pump is belt-driven from the
crankshaft pulley and uses a sealed ball bearing and a carbon-ceramic
face seal. Coolant flows from the lower radiator tank into the pump,
then through the cylinder block water jackets, upward through the
cylinder head, and out through the thermostat housing. A separate
coolant circuit serves the EGR cooler and the oil cooler.
The system incorporates a wax-pellet thermostat located in a housing at
the front of the cylinder head. The thermostat begins opening at 82°C
(180°F) and is fully open at 95°C (203°F). The radiator is a cross-flow,
aluminum design with plastic tanks. An electric cooling fan is
controlled by the ECU based on inputs from the Engine Coolant
Temperature (ECT) sensor.
Coolant Capacity (engine only): 2.5 L (2.6 U.S. qt)
Coolant Capacity (engine with radiator): 7.5-8.0 L (7.9-8.5 U.S. qt)
Thermostat Opening Temperature: 82°C (180°F)
Thermostat Fully Open Temperature: 95°C (203°F)
Radiator Cap Pressure: 140 kPa (20 psi)
Water Pump Type: Centrifugal, belt-driven
Coolant Type: Long-life ethylene glycol antifreeze
Turbocharging System: The engine is equipped with a Mitsubishi TD025
turbocharger. On earlier variants (Y17DT, Y17DTL), the turbocharger is a
fixed-geometry unit. On later common rail variants (Z17DT, Z17DTR,
A17DTS, and Ecoflex engines), the turbocharger features variable
geometry (variable turbine geometry, VTG). The variable geometry system
adjusts the angle of vanes in the turbine housing to optimize boost
pressure across the engine speed range, reducing turbo lag and improving
low-end torque. Boost pressure is controlled by the ECU via a
vacuum-actuated or electric actuator. An intercooler (charge-air cooler)
is present on all variants except the low-power Y17DTL, which omits the
intercooler to reduce manufacturing cost.
Exhaust System and Emissions Control: The exhaust manifold is a cast
iron, four-into-one design. The exhaust system includes an oxidation
catalytic converter. For Euro 4 and Euro 5 variants, an exhaust gas
recirculation (EGR) system is present. The cooled EGR system routes a
portion of exhaust gases back into the intake manifold to reduce
combustion temperatures and suppress NOx formation. The EGR valve is
electronically controlled by the ECU. A diesel particulate filter (DPF)
is not present on Euro 3 and Euro 4 variants; certain Euro 5 variants
may include a DPF depending on vehicle application.
Glow Plug System: The engine is equipped with four glow plugs for cold
starting assistance. The glow plugs are controlled by the ECU through a
glow plug control module. Pre-glow (heating before cranking) and
post-glow (heating after starting) cycles are managed automatically
based on coolant temperature. Glow plug activation is indicated by a
dashboard warning lamp.
Electrical System: The electrical system is 12-volt with negative
ground. The starter motor is a pre-engaged type with an integral
solenoid. The alternator is a 12-volt, internally regulated unit with an
output of 90-120 A depending on vehicle specification. The battery is a
lead-acid, maintenance-free type with a capacity of 60-70 Ah.
Overall Length (front of water pump to flywheel face): 590 mm (23.2 in)
Overall Width (valve cover edge to oil pan edge): 620 mm (24.4 in)
Overall Height (bottom of oil pan to top of cam cover): 680 mm (26.8 in)
Dry Weight (complete engine, no fluids): 145 kg (320 lb)
Weight (long block with flywheel): 115 kg (254 lb)
Timing Belt Replacement Interval: 100,000 km (62,000 miles) or 5 years.
Engine Oil Change Interval: 15,000-20,000 km (9,300-12,400 miles) or 12
months.
Oil Filter Change Interval: Every oil change.
Fuel Filter Change Interval: 30,000 km (18,600 miles) or annually.
Coolant Change Interval: 50,000 km (31,000 miles) or 4 years.
Air Cleaner Element Replacement: 40,000 km (25,000 miles).
Glow Plug Inspection Interval: 80,000 km (50,000 miles).
EGR Valve Cleaning Interval: 60,000 km (37,000 miles).
Turbocharger Inspection Interval: 100,000 km (62,000 miles).
Cylinder Head Bolts (M11 x 1.5), Step 1: 30 Nm (22 lb-ft)
Cylinder Head Bolts (M11 x 1.5), Step 2: 70 Nm (52 lb-ft)
Main Bearing Cap Bolts (M10 x 1.25), Step 1: 30 Nm (22 lb-ft)
Main Bearing Cap Bolts (M10 x 1.25), Step 2: 50 Nm (37 lb-ft)
Connecting Rod Cap Bolts (M9 x 1.0), Step 1: 20 Nm (15 lb-ft)
Connecting Rod Cap Bolts (M9 x 1.0), Step 2: 40 Nm (30 lb-ft)
Flywheel Bolts (M10 x 1.25): 60 Nm (44 lb-ft)
Camshaft Bearing Cap Bolts (M6 x 1.0): 12 Nm (9 lb-ft)
Camshaft Timing Belt Sprocket Bolt (M12 x 1.25): 80 Nm (59 lb-ft)
Timing Belt Tensioner Bolt (M8 x 1.25): 25 Nm (18 lb-ft)
Intake Manifold Bolts (M8 x 1.25): 22 Nm (16 lb-ft)
Exhaust Manifold Nuts (M8 x 1.25): 25 Nm (18 lb-ft)
Injector Hold-Down Clamp Bolts (M6 x 1.0): 10 Nm (7 lb-ft)
Glow Plugs (M8 x 1.0): 15 Nm (11 lb-ft)
Rocker Cover Bolts (M6 x 1.0): 8 Nm (6 lb-ft)
Oil Pan Bolts (M6 x 1.0): 10 Nm (7 lb-ft)
Water Pump Bolts (M8 x 1.25): 22 Nm (16 lb-ft)
Thermostat Housing Bolts (M8 x 1.25): 22 Nm (16 lb-ft)
Oil Filter Housing Bolts (M8 x 1.25): 25 Nm (18 lb-ft)
Starter Motor Bolts (M10 x 1.25): 45 Nm (33 lb-ft)
Alternator Bracket Bolts (M8 x 1.25): 22 Nm (16 lb-ft)
Crankshaft Pulley Bolt (M16 x 1.5): 180 Nm (133 lb-ft)
The Isuzu 4EE2 (Circle L) engine was utilized in European market
passenger vehicles and light commercial vehicles from approximately 1999
to 2015.
Y17DT (Euro 3, 55 kW / 75 hp):
Opel Corsa C 1.7 DTI 16V (2000-2003)
Opel Astra G 1.7 DTI 16V (1999-2003)
Opel Meriva A 1.7 DTI 16V (2003-2005)
Opel Combo C 1.7 DTI 16V
Y17DTL (Euro 3, 48 kW / 65 hp, no
intercooler):
Opel Corsa C 1.7 16V (2000-2003)
Opel Combo C 1.7 16V
Z17DTL (Euro 3 common rail, 59 kW / 80 hp):
Opel Astra G 1.7 CDTI 16V (2003-2004)
Z17DT (Euro 4 common rail, 75 kW / 101 hp):
Opel Corsa C 1.7 CDTI 16V (2003-2006)
Opel Meriva A 1.7 CDTI 16V (2003-2005)
Opel Combo C 1.7 CDTI 16V
Z17DTH and A17DT (Euro 4, 75 kW / 101 hp,
260 Nm):
Opel Meriva A 1.7 CDTI (2005-2010)
Opel Astra H 1.7 CDTI (2004-2008)
Z17DTJ and A17DTJ (Ecoflex, 81 kW / 110
hp):
Opel Astra H 1.7 CDTI 16V (2007-2009)
Opel Astra GTC / SW 1.7 CDTI 16V (2007-2010)
Opel Zafira B 1.7 CDTI 16V (2007-2008)
A17DTC and A17DTE (Ecoflex Euro 5, 81 kW /
110 hp):
Opel Meriva B 1.7 CDTI 16V (2010 onward)
Opel Zafira B 1.7 CDTI 16V (2008-2014)
Opel Astra J 1.7 CDTI 16V (2010-2014)
Z17DTR and A17DTR (Euro 4/5, 93 kW / 125
hp):
Opel Corsa D 1.7 CDTI 16V (2006-2011)
Opel Corsa D GSi 1.7 CDTI (2007-2011)
Opel Meriva A 1.7 CDTI 16V (2006-2010)
Opel Astra H 1.7 CDTI 16V (2007-2009)
Opel Zafira B 1.7 CDTI (2009-2014)
Opel Astra J 1.7 CDTI (2010-2011)
A17DTS (Euro 5, 96 kW / 130 hp):
Opel Corsa D 1.7 CDTI (2011-2013)
Opel Astra J 1.7 CDTI (2011-2014)
Opel Meriva B 1.7 CDTI (2010-2013)
Opel Mokka 1.7 CDTI (2012-2015)
Chevrolet Cruze 1.7 VCDi (2012-2014)
Chevrolet Trax 1.7 D (2013-2015)
Honda Civic VII (European model, 2001-2005): 1.7 CTDi 4EE2 engine
producing 74 kW (100 hp) at 4,400 rpm and 220 Nm (162 lb-ft) at 1,800
rpm. Honda's version used common rail direct injection technology,
similar to later Opel common rail variants. The Honda variant was part
of a technology exchange agreement where Honda supplied the J35A3 V6
engine to General Motors in return.
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