The Renault J6R 712 is a 2,165 cc, inline‑six petrol engine produced between 1985 and 1996. It features a single overhead camshaft (SOHC), two valves per cylinder, and electronic fuel injection. This robust powerplant typically produced 83 kW (113 PS) and 172 Nm of torque, designed for smooth, linear power delivery in executive sedans.
Fitted primarily to the Renault 25 and Safrane, the J6R 712 was engineered to provide refined, effortless cruising and strong mid — range p…
All production years (1985–1996) meet Euro 1 standards for passenger vehicles .
The Renault J6R 712 is a 2,165 cc inline‑six petrol engine engineered for executive sedans (1985-1996). It combines a simple SOHC valvetrain with electronic fuel injection to deliver smooth, linear power and torque. Designed to meet Euro 1 standards, it prioritizes durability and refinement over high-revving performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,165 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.0 mm × 75.7 mm | |
Power output | 83 kW (113 PS) | |
Torque | 172 Nm @ 3,500 rpm | |
Fuel system | Bosch LE2-Jetronic electronic injection | |
Emissions standard | Euro 1 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 10W‑40 mineral or semi-synthetic | |
Dry weight | 165 kg |
The Renault J6R 712 was used across Renault's executive platforms with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts and exhaust manifolds for the Renault 25-and was also fitted to the succeeding Safrane model, creating a direct lineage. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Renault technical bulletins (1985-1996) and historical workshop data. 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
The J6R 712 is fundamentally a robust and smooth engine. Its Achilles' heel is the cylinder head gasket, which is prone to failure, especially if the engine has ever overheated. Replacing it with the revised MLS gasket and maintaining a perfect cooling system allows these engines to run reliably for very high mileages. Regular oil changes are also key.
The most critical issue is cylinder head gasket failure. Other common problems include timing chain rattle on high-mileage engines, faults in the Bosch LE2-Jetronic fuel injection system (particularly the airflow meter and fuel pressure regulator), and general cooling system leaks from aging hoses and the water pump.
The J6R 712 was used in the Renault 25 (B29) from 1985 to 1992 and its successor, the Renault Safrane (B54), from 1992 to 1996. It was the base six-cylinder petrol engine for these executive models, badged simply as the '2.2'.
While not a common tuning candidate today, the J6R 712 can be modified. Simple upgrades like a performance exhaust and air filter can yield minor gains. More significant power increases would require engine management remapping (difficult with the LE2-Jetronic system) or internal modifications like a higher-lift camshaft, which are now rare.
Fuel economy is typical for a 2.2L inline-six from the 1980s/90s. Expect around 10.0-12.0 L/100km (24-28 mpg UK) in mixed driving for a Renault 25 or Safrane. Highway cruising can yield 8.0-9.0 L/100km (31-35 mpg UK). Economy is heavily influenced by the car's weight and aerodynamics.
Yes. The J6R 712 is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing severe internal damage. Fortunately, the timing chain is very durable and rarely fails if the engine is maintained.
Renault originally specified a 10W-40 mineral oil. For high-mileage engines, a quality 10W-40 semi-synthetic oil is often recommended for better protection. Changing the oil and filter every 10,000 km or annually is crucial for engine longevity, especially to protect the timing chain and bearings.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
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.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.