The Renault J7T 708 is a 2,068 cc, inline‑four turbo‑diesel engine produced between 1985 and 1992. It features a cast‑iron block, indirect injection via a Bosch mechanical pump, and a single overhead camshaft (SOHC) valvetrain. Output was rated at approximately 65 kW (88 PS), with a torque figure of around 185 Nm, providing strong low‑end pull for its era.
Fitted primarily to the R21 Turbo D and early Safrane TD models, the J7T 708 was engineered to offer diesel efficiency with enhanced performance over naturally aspirated units. It prioritised durability and torque for executive sedans and estates. Emissions compliance for its era was managed through its mechanical injection system and turbocharging.
One documented concern is the potential for turbocharger failure, particularly if the engine is not allowed to idle before shutdown to cool the turbo bearing. This issue, referenced in Renault technical bulletins, is common to early turbo-diesel designs. The J7T series was eventually superseded by more advanced direct-injection engines.
Production years 1985–1992 predate the Euro 1 standard (1992). Emissions compliance is based on national regulations in effect at time of manufacture (VCA UK Type Approval historical records).
The Renault J7T 708 is a 2,068 cc inline‑four turbo‑diesel engineered for executive sedans and estates (1985-1992). It combines a robust cast‑iron block with SOHC valvetrain and indirect injection to deliver dependable, torque‑focused performance. Designed for pre‑Euro emissions standards, it balances mechanical simplicity with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,068 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 88.0 mm × 85.0 mm | |
| Power output | 65 kW (88 PS) | |
| Torque | 185 Nm @ 2,500 rpm | |
| Fuel system | Indirect injection, Bosch mechanical pump | |
| Emissions standard | Pre‑Euro (National Standards) | |
| Compression ratio | 22.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T2 or equivalent | |
| Timing system | Chain‑driven camshaft | |
| Oil type | Mineral 15W‑40 | |
| Dry weight | Not specified in available OEM docs |
The turbocharger provides strong low-RPM torque ideal for relaxed cruising but requires the engine to idle for 30-60 seconds after hard driving to cool the turbo bearing. Using a quality mineral 15W-40 oil is critical. The mechanical injection system is robust but sensitive to fuel quality; water in fuel can damage the pump. The timing chain is generally durable but should be inspected if unusual noise develops. Turbo seals are a common wear item.
Oil Specs: Recommends mineral 15W-40 (Renault Tech. Manual 77 11 198 545). Modern equivalents meeting API CF-4 are acceptable.
Emissions: Pre-dates Euro standards. Compliance based on national regulations circa 1985-1992 (VCA Historical Records).
Power Ratings: Measured under DIN 70020 standards (Renault PT-1990 Archive).
Renault Technical Information System: Manual 77 11 198 545
Renault EPC (Electronic Parts Catalogue) Reference: J7T
UK Vehicle Certification Agency (VCA) Historical Database
Renault Group Powertrain Specifications (PT-1990 Archive)
The Renault J7T 708 was used across Renault's R21 platform with longitudinal mounting. This engine received platform-specific adaptations-different intake manifolds and engine mounts for sedan, estate, and Nevada variants. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the gearbox flange. The full code (e.g., J7T 708) will be present. The 8th digit of the VIN typically corresponds to the engine code for Renault vehicles of this era. Visually, it is a large, cast-iron inline-4 engine with a prominent turbocharger and exhaust manifold on the right side (viewed from front). Differentiate from the naturally aspirated J7R (2.2L petrol) by the presence of the turbo and associated plumbing. The SOHC design (single cam cover) distinguishes it from later DOHC engines.
The J7T 708's primary reliability risk is turbocharger failure, with elevated incidence in high-mileage examples or those subjected to aggressive driving without proper cooldown. Renault workshop data indicates turbo bearing/seal wear is a known issue, while owner club surveys frequently cite it as a major service cost. Adherence to the post-drive idle protocol and using correct oil viscosity make preventative maintenance critical.
Analysis derived from Renault technical bulletins (1985-1995) and owner club technical archives (1990-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT J7T-708.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with RENAULT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
RENAULT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialRENAULT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
