Renault S9W Specifications
| Engine Model: Renault S9W |
| Engine Type: 4-cycle inline 4-cylinder SOHC 8-valve turbocharged liquid-cooled diesel |
| Total Displacement: 170.8 cu.in (2.79 L) |
| Rated Engine Power: 114-125 Hp (84-92 kW) at 3600 rpm |
| Fuel System Type: Mechanical direct injection or Common rail direct injection |
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The Renault S9W is a 2.8-liter inline-4 diesel engine
belonging to the Sofim 8140 family. Developed through a collaboration between
Sofim, Renault, and Iveco, this engine represents a larger-displacement
evolution of the 2.5-liter S8U, utilizing a lengthened stroke and turbocharging
to deliver enhanced torque for commercial vehicle applications. Produced
throughout the late 1990s and early 2000s, the S9W served as a high-torque
powerplant for light trucks, vans, and passenger-carrying vehicles across
multiple European manufacturers. Later variants incorporated common rail fuel
injection, designated under Renault’s dCi nomenclature, before being superseded
by the G9U engine family.
The Renault S9W embodies the robust, over-engineered architecture characteristic
of the Sofim 8140 engine family. Its construction utilizes a cast iron cylinder
block with an aluminum cylinder head, providing a foundation capable of
sustaining high mileage under demanding commercial duty cycles. The single
overhead camshaft (SOHC) valvetrain with eight valves offers mechanical
simplicity conducive to straightforward service access.
The direct injection fuel system, transitioning from mechanical rotary pump to
common rail in later iterations, provides improved cold-start capability and
fuel efficiency compared to the indirect injection configuration of its
smaller-displacement predecessor. The turbocharger with intercooler generates
substantial low-end torque, with peak output available from 1,800 rpm, enabling
strong pulling power for laden vehicles. The timing belt drive requires rigorous
adherence to replacement intervals, as the engine operates as an interference
design. The S9W’s durability and torque characteristics made it a preferred
powertrain for delivery vans, ambulances, and light commercial trucks throughout
its production life.
Engine Type: Inline 4-cylinder, 4-cycle, water-cooled, turbocharged diesel.
Displacement: 2,799 cc (170.8 cu.in).
Bore x Stroke: 94.4 mm x 100.0 mm (3.72 in x 3.94 in).
Compression Ratio: 18.5:1 for turbocharged mechanical injection variants.
Compression Ratio: 18.0:1 for common rail variants.
Firing Order: 1-3-4-2.
Aspiration: Turbocharged with air-to-air intercooler.
Maximum Power: 114-125 hp (84-92 kW) @ 3,600 rpm.
Maximum Torque: 270-300 Nm (200-221 lb-ft) @ 1,800 rpm.
Idle Speed: 800 ± 25 rpm.
Valvetrain: SOHC, 8 valves (2 valves per cylinder).
Mechanical valve adjusters with threaded rocker arms.
The cylinder block is constructed from cast iron with a
deep-skirt design extending below the crankshaft centerline to maximize rigidity
under high cylinder pressures. The block is of monobloc construction with
integral cylinder bores, each bore induction-hardened to resist wear under
extended service intervals. Five main bearings support the crankshaft, with each
bearing cap secured by two bolts.
The block incorporates a robust water jacket surrounding each cylinder to manage
the thermal loads associated with turbocharged diesel operation. The timing
housing is integrated into the front face of the block, providing mounting
surfaces for the timing belt tensioner, idler pulleys, and accessory drive
components. The engine mounting points are positioned on the block sides and
front, providing rigid attachment for commercial vehicle chassis installations.
The block also incorporates a cast-in oil gallery that supplies pressurized oil
to the main bearings, cylinder head, and turbocharger.
The cylinder head is manufactured from aluminum alloy,
selected for its lightweight properties and efficient heat transfer. It employs
a SOHC configuration with the camshaft supported by five bearings. The eight
valves are arranged with two valves per cylinder, positioned in a vertical
orientation. Valve actuation is achieved via rocker arms operating from the
camshaft, with threaded adjusters and locknuts for manual valve clearance
setting. The combustion chambers are of the direct injection type with a
re-entrant bowl design machined into the piston crowns.
The cylinder head incorporates separate intake and exhaust ports on opposite
sides, with the intake ports designed to generate swirl motion for improved
air-fuel mixing. The exhaust manifold is integrated into the cylinder head
casting in some variants, with a turbocharger mounting flange positioned at the
rear of the head. Valve guides and seats are replaceable components to
facilitate cylinder head overhaul.
The S9W utilizes two distinct fuel system
configurations depending on production period. Early variants employ a
mechanical direct injection system with a Bosch in-line or rotary injection
pump, gear-driven from the timing system. The injection pump incorporates a
mechanical governor and delivers fuel at high pressure to nozzle-type injectors.
Injector opening pressure is calibrated to approximately 220-240 bar
(3,190-3,480 psi).
Later common rail variants, designated under the dCi nomenclature, utilize a
high-pressure pump generating rail pressures up to 1,350 bar (19,580 psi), with
electronically controlled injectors delivering multiple injection events per
cycle. The common rail system incorporates a rail pressure sensor, fuel
temperature sensor, and ECU-controlled pressure regulator. Both configurations
utilize a fuel feed pump, water-separating filter assembly, and a fuel return
circuit to maintain consistent fuel temperature.
The lubrication system is a pressurized, wet-sump
configuration designed for the extended operating cycles of commercial
applications. A gear-type oil pump, driven by the crankshaft timing gear,
circulates engine oil through a full-flow disposable filter. An integral oil
cooler, of the water-to-oil type, maintains oil temperature within operational
limits under sustained high-load conditions.
The system incorporates a large-capacity sump with capacity varying by vehicle
application and oil pan configuration. Oil galleries within the cylinder block
and cylinder head supply pressurized oil to the five main bearings, connecting
rod bearings, camshaft bearings, rocker arm assemblies, and the turbocharger
bearing housing. The turbocharger receives oil through a dedicated supply line
with a restrictor fitting, returning oil via a gravity drain to the sump. A
pressure relief valve maintains system pressure within specified limits.
The cooling system is a pressurized, water-cooled
design with capacity to manage the thermal output of a turbocharged diesel
engine in commercial duty cycles. A belt-driven water pump circulates coolant
through the cylinder block, cylinder head, and radiator. The water pump is
driven by the timing belt in mechanical injection variants or by the accessory
belt in common rail configurations.
A wax-type thermostat, beginning to open at 82-88°C (180-190°F), regulates
coolant flow to maintain operating temperature. The radiator is a cross-flow
type with high-density core construction, often supplemented by a coolant
recovery reservoir. A viscous fan coupling drives the engine cooling fan,
providing variable fan speed proportional to engine temperature. The system is
designed to accommodate additional coolant capacity for heater circuits in
passenger van and bus configurations.
Glow Plug System: The engine is equipped with a glow
plug system for cold-start assistance. Glow plugs are installed in the cylinder
head adjacent to each injector, controlled by a glow control unit that modulates
pre-heat duration based on coolant temperature. After-glow operation supports
cold-idle stability following start-up and reduces white smoke emissions.
Timing System: The camshaft and injection pump (on mechanical variants) are
driven by a rubber-reinforced timing belt. The belt engages the crankshaft
sprocket and routes around tensioner and idler pulleys. The engine is an
interference design; timing belt failure results in piston-to-valve contact,
causing extensive engine damage.
Turbocharger System: A fixed-geometry turbocharger provides forced induction.
The turbocharger is mounted to the exhaust manifold, with boost pressure
regulated by a wastegate actuator. The intercooler is mounted forward of the
radiator in the cooling airflow path to increase charge air density.
Emission Control: Early mechanical injection variants utilize exhaust gas
recirculation (EGR) and a diesel oxidation catalyst to meet Euro 2 and Euro 3
standards. Common rail variants incorporate additional systems including a
diesel particulate filter (DPF) and closed-loop EGR control to meet Euro 3 and
Euro 4 emission requirements.
Electrical System: The charging system consists of a 12-volt, 90-120 amp
alternator, with heavy-duty variants utilizing higher output units for
commercial applications. The starter motor is a 2.2-2.8 kW (2.9-3.8 hp)
high-torque unit designed for cold cranking under high compression ratios.
Dry Weight: 220 kg (485 lb), including turbocharger and
injection equipment.
Overall Length (from accessory drive to flywheel housing): 710 mm (28.0 in).
Overall Width: 660 mm (26.0 in).
Overall Height: 780 mm (30.7 in).
Engine Oil Capacity (with filter): 6.0-7.0 liters
(6.3-7.4 qt), varying by oil pan configuration. Engine Oil Specification: SAE
5W-40, 10W-40, or 15W-40 meeting API CI-4, ACEA B3, or higher classification for
diesel engines. Engine Oil Pressure (at idle): Minimum 0.8 bar (12 psi). Engine
Oil Pressure (at 3,000 rpm): 3.0-4.5 bar (44-65 psi). Timing Belt Replacement
Interval: Every 60,000 km (37,000 miles) or 5 years.
Coolant Capacity: 8.5-10.0 liters (9.0-10.6 qt), varying by radiator
configuration and heater circuit presence. Coolant Specification: Ethylene
glycol-based antifreeze with corrosion inhibitors and supplemental coolant
additives for diesel applications. Valve Clearance (Cold): Intake: 0.20-0.30 mm
(0.008-0.012 in). Exhaust: 0.25-0.35 mm (0.010-0.014 in). Valve Clearance
Inspection Interval: Every 40,000 km (25,000 miles).
Injector Opening Pressure (Mechanical): 220-240 bar (3,190-3,480 psi). Common
Rail Injection Pressure: Maximum 1,350 bar (19,580 psi) at full load. Glow Plug
Resistance: 0.6-1.0 ohms per plug. Idle Speed: 800 ± 25 rpm. Turbocharger Boost
Pressure: 0.7-0.9 bar (10-13 psi) at full load. Compression Pressure: Standard:
28-32 bar (406-464 psi) at cranking speed. Minimum allowable: 24 bar (348 psi).
Maximum variation between cylinders: 3 bar (44 psi).
Cylinder Head Bolts (M12), Stage 1: 40 Nm (30 lb-ft).
Cylinder Head Bolts (M12), Stage 2: 80 Nm (59 lb-ft).
Cylinder Head Bolts (M12), Stage 3: 100 Nm (74 lb-ft).
Main Bearing Cap Bolts: 100-110 Nm (74-81 lb-ft).
Connecting Rod Cap Bolts: 50-55 Nm (37-41 lb-ft).
Camshaft Bearing Cap Bolts: 20-25 Nm (15-18 lb-ft).
Camshaft Sprocket Bolt: 80-90 Nm (59-66 lb-ft).
Flywheel Bolts: 95-105 Nm (70-77 lb-ft).
Crankshaft Pulley Bolt: 180-200 Nm (133-148 lb-ft).
Intake Manifold Nuts: 20-25 Nm (15-18 lb-ft).
Exhaust Manifold Nuts: 30-35 Nm (22-26 lb-ft).
Injector Hold-Down Clamp Bolts: 25-30 Nm (18-22 lb-ft).
Glow Plugs: 20-25 Nm (15-18 lb-ft).
Rocker Arm Shaft Bolts: 25-30 Nm (18-22 lb-ft).
Valve Cover Bolts: 8-10 Nm (6-7 lb-ft).
Oil Pan Bolts: 10-12 Nm (7-9 lb-ft).
Oil Pump Mounting Bolts: 20-25 Nm (15-18 lb-ft).
Timing Belt Tensioner Bolt: 25-30 Nm (18-22 lb-ft).
Water Pump Bolts: 20-25 Nm (15-18 lb-ft).
Turbocharger Mounting Nuts: 40-45 Nm (30-33 lb-ft).
Engine Mount (Bracket to Block): 70-80 Nm (52-59 lb-ft).
Engine Mount (Through Bolt): 90-100 Nm (66-74 lb-ft).
The Renault S9W engine was utilized across a broad
range of light commercial vehicles, light trucks, and passenger vans under
multiple brand names during its production lifecycle.
Renault Master II: 1997-2001, the S9W served as a powerplant for both turbo
diesel (mechanical injection) and early dCi (common rail) variants of this large
van platform.
Renault Messenger / B-Series Trucks: Light truck variants of the Master platform
received the S9W engine for commercial applications.
IVECO Daily (Second Generation): The engine was designated under the Sofim
8140.43 code, powering the IVECO Daily across European markets.
Fiat Ducato (1998-2002): The S9W was installed in Fiat Ducato models as a 2.8
TDI powerplant, marketed under the Sofim engine designation.
Citroen Jumper / Peugeot Boxer (1998-2002): The engine appeared in these PSA
commercial vehicles under the Sofim 8140.43 designation, providing high-torque
diesel power for the light truck range.
Opel/Vauxhall Movano A (1998-2001): The first-generation Movano, sharing its
platform with the Renault Master, utilized the S9W engine across European
markets.
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