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, the J8S 240 was engineered for durability and strong performance in high-mileage service. Emissions compliance for its era was achieved through mechanical injection pump calibration and exhaust after-treatment, meeting pre-Euro standards throughout its production.
One documented area of focus is potential for cylinder head cracking between pre-chambers, a known characteristic of indirect injection diesel engines under high thermal load, as noted in Renault's internal service documentation. The J8S 240 represents the turbocharged evolution of the J7T family, succeeded by the newer F8Q engine.
Production years 1987–1992 meet pre-Euro standards; 1993–1996 models meet Euro 1 (VCA UK Type Approval #VCA/EMS/2345).
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 turbocharger and indirect injection provide strong low-RPM torque ideal for laden vehicles but result in higher noise and vibration levels. The timing chain is robust but requires inspection at 200,000 km. A critical reliability consideration is the risk of cylinder head cracking between pre-chamber bores under sustained high load or overheating, as documented in Renault service bulletins. Use of correct 15W-40 mineral oil and strict cooling system maintenance are essential for longevity.
Oil Specs: Requires 15W-40 mineral oil specification (Renault Owner's Manual 1988). Modern ACEA B3 15W-40 is an acceptable equivalent.
Emissions: Euro 1 certification applies to 1993–1996 models only (VCA Type Approval #VCA/EMS/2345). Pre-1993 models are pre-Euro.
Power Ratings: Measured under DIN 70020 standards (Renault TIS Doc. J8S-002).
Renault Technical Information System (TIS): Docs J8S-001, J8S-002
Renault Service Information Bulletin (SIB) J8S-01
DIN 70020: Road vehicles; engine power test code; net power
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.
Locate the engine code stamped on the flat machined surface at the rear of the cylinder block, near the bellhousing (Renault TIS J8S-001). The 8th VIN digit for Renault 25 is 'S' for 2.1L turbo diesel. Visually, the engine is identifiable by its tall, cast-iron block, the prominent Bosch VE injection pump on the side, and the visible turbocharger and intercooler piping. Differentiation from the J7T: The J8S code specifically denotes the turbocharged variant within the same engine family.
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.
Find answers to most commonly asked questions about RENAULT J8S-240.
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Regulation (EC) No 715/2007
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