The Renault J8S 240 is a 2,068 cc, inline‑four turbocharged diesel engine produced between 1987 and 1996. It features a cast — iron block, indirect injection via pre — chambers, and a single overhead camshaft (SOHC) valvetrain. This rugged and torque — focused engine delivered 66 kW (90 PS) and 192 Nm of torque, with its turbocharger providing enhanced low — RPM pulling power for commercial and fleet applications.
Fitted to models such as the Renault 25, Trafic I, and Master I…
Production years 1987–1992 meet pre-Euro standards; 1993–1996 models meet Euro 1 .
The Renault J8S 240 is a 2,068 cc inline‑four turbocharged diesel engineered for executive saloons and light commercial vehicles (1987-1996). It combines indirect injection with a robust SOHC design and a turbocharger to deliver strong low-RPM torque for demanding work cycles. Designed to meet evolving emissions standards, later models incorporated catalysts for Euro 1 compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,068 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 89.0 mm | |
Power output | 66 kW (90 PS) @ 4,300 rpm | |
Torque | 192 Nm @ 2,500 rpm | |
Fuel system | Indirect injection (Bosch VE rotary pump) | |
Emissions standard | Pre-Euro (1987-1992); Euro 1 (1993-1996) | |
Compression ratio | 21.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single turbocharger (Garrett) | |
Timing system | Chain‑driven | |
Oil type | Renault 15W‑40 mineral oil | |
Dry weight | 195 kg |
The Renault J8S 240 was used across Renault's executive and light commercial platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Master I and revised cooling system routing for the Trafic I. All adaptations are documented in OEM technical bulletins.
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The J8S 240's primary reliability consideration is cylinder head cracking between pre-chambers, a known failure mode for indirect injection diesels under thermal stress. Renault service data indicates this was often linked to cooling system neglect or sustained high load, while owner surveys show well-maintained examples are exceptionally durable. Adherence to cooling system maintenance and avoiding prolonged high RPM operation makes this a manageable concern.
Analysis derived from Renault technical bulletins (1987-1996) and owner club reliability surveys (1995-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
With diligent maintenance, yes. Its primary weakness is the potential for cylinder head cracking, often triggered by overheating. The engine is otherwise mechanically simple and robust. Regular cooling system servicing and using the correct mineral oil are key to longevity. Many examples have exceeded 400,000 km in commercial service with proper care.
The most common issues are cylinder head cracking between pre-chambers, cooling system leaks from aged hoses and components, turbocharger failures, and Bosch VE injection pump malfunctions.
The J8S 240 was used in the Renault 25 Turbo D (1987-1996), Renault Trafic I Turbo D (1987-1996), and Renault Master I Turbo D (1988-1996). It was not used in any Dacia or Nissan models. This engine code specifically denotes the turbocharged 2.1L diesel variant.
Minor tuning is possible by adjusting the injection pump or boost pressure, but significant gains are not practical. The engine's indirect injection and mechanical systems limit its potential. Aggressive tuning increases the risk of head gasket or head cracking failure.
Official figures are scarce, but real-world consumption is typically 7-9 L/100km (40-31 mpg UK) for the Renault 25 Turbo D, and 9-12 L/100km (31-23 mpg UK) for the heavier Trafic and Master vans, depending on load and driving style. Fuel economy is reasonable for its era and application.
Yes. The J8S 240 is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, resulting in severe internal engine damage requiring a major rebuild.
Renault originally specified 15W-40 mineral oil. A modern, high-quality 15W-40 meeting ACEA B3 standards is perfectly suitable and may offer better protection. Regular oil changes (every 10,000 km or annually) are crucial for engine health, especially given the high compression ratio and turbocharger.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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