Chrysler ENS Specifications
| Engine Model: Chrysler ENS |
| Engine Type: 4-cycle 4-cylinder DOHC 16-valve turbocharged liquid-cooled diesel |
| Total Displacement: 169.4 cu.in (2.77 L) |
| Rated Engine Power: 163-200 hp (120-147 kW) at 3800 rpm |
| Fuel System Type: Common Rail Direct Injection |
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The Chrysler ENS engine is a 2.8-liter, inline
4-cylinder turbocharged diesel powerplant manufactured for Chrysler Group LLC by
VM Motori. A member of the RA 428 engine family, it was engineered to provide a
balance of high torque output and fuel efficiency for mid-size SUVs and minivans
in export markets.
Produced from approximately 2007 to 2017, the ENS was notable for its robust
cast iron construction paired with a sophisticated aluminum cylinder head. Its
design incorporates a dual overhead camshaft (DOHC) valvetrain and a common rail
direct injection (CRD) system, which enabled it to meet stringent European
emissions standards while delivering driving performance characterized by
substantial low-end pulling power.
The engine’s application across the Jeep Wrangler (JK), Jeep Cherokee (KK), and
Chrysler Grand Voyager underscored its versatility, offering a diesel
alternative in markets where high torque and extended range were prioritized
over gasoline powertrains.
The Chrysler ENS engine is a 4-stroke, compression-ignition internal combustion
engine.
Engine Type: Inline 4-cylinder, liquid-cooled, turbocharged diesel.
Valvetrain: DOHC (Double Overhead Camshaft), 4 valves per cylinder, timing belt
driven.
Displacement: 2,776 cc (169.4 cu.in).
Bore: 94.0 mm (3.70 in).
Stroke: 100.0 mm (3.94 in).
Compression Ratio: 17.5:1.
Firing Order: 1-3-4-2.
Power (Standard Output): 120 kW (163 hp) at 3,800 rpm.
Power (High Output - Jeep Wrangler/Cherokee): 130 kW (177 hp) at 3,800 rpm.
Power (Later High Output): 147 kW (200 hp) at 3,600 rpm.
Torque (Standard Output - Minivan): 360 Nm (265 lb-ft) from 1,600 to 3,000 rpm.
Torque (High Output - SUV): 460 Nm (339 lb-ft) from 1,800 to 2,000 rpm.
The cylinder block is constructed from high-strength
cast iron, a design choice made to withstand the high mechanical and thermal
stresses associated with turbocharged diesel combustion. The block features a
closed-deck design, enhancing rigidity and bore stability under load.
Cylinder Configuration: 4 cylinders in a straight line. Main Bearings: The
crankshaft is supported by 5 main bearings, providing a robust foundation for
the rotating assembly. Bore Finish: The cylinder bores are precision machined
and honed to ensure optimal ring seal and oil control.
Crankcase: Deep-skirt design extends below the crankshaft centerline,
contributing to overall structural rigidity and reduced noise, vibration, and
harshness (NVH). Crankshaft: Forged steel crankshaft designed for high-cycle
fatigue strength. Connecting Rods: Forged steel connecting rods with a fractured
cap design for precise alignment during assembly.
The cylinder head is manufactured from an aluminum
alloy to reduce overall engine weight and facilitate efficient heat transfer. It
incorporates a cross-flow design to optimize the intake and exhaust gas paths.
Configuration: DOHC with 4 valves per cylinder, actuated by roller finger
followers. The timing belt drives both camshafts from the crankshaft. Valves:
Intake and exhaust valves are positioned to create a central combustion chamber.
Valve Diameter (Intake): 30.0 mm (1.18 in). Valve Diameter (Exhaust): 26.0 mm
(1.02 in). Valve Stem Seals: High-temperature fluorocarbon rubber seals are used
to control oil consumption.
Combustion Chamber: The combustion chambers are located in the piston crown
(re-entrant type) rather than the cylinder head, a characteristic of direct
injection diesel engines. The aluminum head contains the injector nozzles and
glow plugs.
Glow Plugs: Ceramic or steel glow plugs are utilized for cold-start assistance,
controlled by the engine management system to regulate pre-heating and
post-heating cycles.
The ENS engine employs a Common Rail Direct Injection
(CRD) system, supplied primarily by Bosch. This system operates independently of
engine speed to deliver fuel at extremely high pressure, enabling precise
injection control for reduced emissions and noise.
Injection Type: High-pressure common rail direct injection. High-Pressure Pump:
A radial piston pump (Bosch CP1 or CP3 variant) draws fuel from the tank and
supplies it to the fuel rail at pressures up to 1,600 bar (23,206 psi). Fuel
Rail: A common manifold that stores pressurized fuel and distributes it to the
injectors. Injectors: Solenoid or piezoelectric-actuated injectors capable of
multiple injection events per combustion cycle (pilot, main, post injections).
Fuel Filtration: A high-efficiency fuel filter with a water separator is
integrated into the system to protect the high-pressure components from
contamination and water ingress. Fuel: Designed for ultra-low sulfur diesel
(ULSD) meeting EN 590 or equivalent specifications.
The lubrication system is a full-flow, pressurized
system designed to provide consistent protection across a wide range of
operating temperatures. Oil Pump: A gear-type oil pump mounted to the front of
the crankshaft drives the system. Oil Capacity (with filter): 6.6 L (7.0 qt).
Oil Specification: Synthetic oil meeting Chrysler Material Standard MS-10725 is
mandatory, with viscosity grades of 0W-40 or 5W-40 recommended to ensure proper
flow during cold starts and adequate film strength at high operating
temperatures.
Oil Cooler: A water-to-oil heat exchanger is mounted on the engine block,
utilizing the engine coolant to stabilize oil temperature. Crankcase
Ventilation: A closed crankcase ventilation (CCV) system routes blow-by gases
back into the intake system to reduce atmospheric emissions.
The cooling system is pressurized and uses a
thermostatically controlled, forced circulation design to maintain optimal
engine operating temperatures. Water Pump: A belt-driven centrifugal pump
circulates coolant through the engine block, cylinder head, and the vehicle’s
heater core.
Thermostat: A wax-pellet thermostat controls the coolant flow to the radiator.
The opening temperature is typically 88°C (190°F). Coolant Capacity (Engine
only): Approximately 3.5 L (3.7 qt). Total system capacity varies by vehicle
application: Minivan (Chrysler Grand Voyager): 12.5 L (13.2 qt). SUV (Jeep
Wrangler/Cherokee): 16.6 L (17.5 qt).
Coolant Type: HOAT (Hybrid Organic Acid Technology) coolant, colored orange or
purple, is required to prevent corrosion and cavitation within the cast iron
block and aluminum radiator components.
Intercooler: A separate air-to-air intercooler (charge air cooler) is integrated
into the vehicle’s front-end module to reduce the temperature of compressed air
from the turbocharger, increasing charge density and combustion efficiency.
Aspiration: The engine is equipped with a turbocharger
featuring Variable Geometry Turbine (VGT) technology. This allows the
turbocharger to adjust the angle of the turbine vanes to optimize boost pressure
across the engine’s rpm range, reducing lag and improving low-end torque.
Engine Management: The engine is controlled by a Bosch EDC (Electronic Diesel
Control) 16 or 17 series engine control unit (ECU). This system manages fuel
injection timing, injection quantity, boost pressure, exhaust gas recirculation
(EGR), and glow plug operation.
Exhaust Gas Recirculation (EGR): A high-pressure EGR system is employed to
reduce nitrogen oxide (NOx) emissions. It recirculates a portion of exhaust gas
back into the intake manifold, lowering combustion temperatures.
Exhaust Aftertreatment: Depending on the market and model year, the system
includes a Diesel Oxidizing Catalyst (DOC) and a Diesel Particulate Filter (DPF)
to meet Euro 5 and Euro 6 emissions standards.
Length: 650 mm (25.6 in).
Width: 650 mm (25.6 in).
Height: 750 mm (29.5 in).
Dry Weight (without fluids and accessories): 180 kg (397 lb).
Installation Weight (with fluids, turbo, and manifolds): 220 kg (485 lb).
Valve Clearance: Hydraulic lash adjusters are
integrated into the valve train; no manual adjustment is required. Timing Belt
Replacement Interval: 120,000 km (75,000 mi) or 5 years, whichever occurs first.
It is critical to replace the timing belt, tensioner, and idler pulleys as a
set.
Engine Oil Change Interval: 10,000 km (6,250 mi) or 12 months under normal
operating conditions; reduced intervals are specified for severe duty cycles
(frequent towing, off-road use). Oil Filter: Replace at every oil change.
Fuel Filter Replacement: 20,000 km (12,500 mi) or 24 months. Coolant
Replacement: 100,000 km (62,000 mi) or 5 years, then every 50,000 km (31,000 mi)
thereafter. Air Filter Replacement: 30,000 km (18,750 mi) or as required based
on operating conditions.
Cylinder Head Bolts (Stage 1): 40 Nm (30 lb-ft).
Cylinder Head Bolts (Stage 2): 100 Nm (74 lb-ft).
Main Bearing Cap Bolts: 60 Nm (44 lb-ft).
Connecting Rod Cap Bolts: 30 Nm (22 lb-ft).
Camshaft Bearing Cap Bolts: 15 Nm (11 lb-ft).
Timing Belt Tensioner Bolt: 25 Nm (18 lb-ft).
Fuel Injector Clamp Bolt: 10 Nm (7 lb-ft).
Glow Plug: 15 Nm (11 lb-ft).
Intake Manifold Bolts: 25 Nm (18 lb-ft).
Exhaust Manifold Nuts: 30 Nm (22 lb-ft).
Oil Filter Cap: 25 Nm (18 lb-ft).
Engine Mount Bracket to Block: 60 Nm (44 lb-ft).
The Chrysler ENS engine
was utilized in the following vehicles for markets outside of North America,
primarily in Europe, Asia-Pacific, and South America:
Chrysler Grand Voyager (RT): Model years 2008 to 2015.
Chrysler Town and Country (RT Export): Model years 2008 to 2015.
Jeep Wrangler (JK): Model years 2007 to 2018.
Jeep Cherokee (KK) / Liberty (KK Export): Model years 2008 to 2012.
Dodge Nitro (KA Export): Model years 2007 to 2011.
Lancia Voyager: Model years 2011 to 2015 (European market).
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