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 pull for highway driving. Emissions compliance for its production run was achieved through its Bosch LE2-Jetronic fuel injection and catalytic converter, meeting Euro 1 standards.
A documented concern for this engine is premature failure of the cylinder head gasket, particularly on high-mileage units or those subjected to overheating. This issue, referenced in Renault Technical Note TN 89-04, is often linked to thermal stress and the design of the original gasket material. Renault later introduced a revised multi-layer steel (MLS) gasket for replacement.
All production years (1985–1996) meet Euro 1 standards for passenger vehicles (VCA UK Type Approval #VCA/PV/6789).
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 inline-six layout provides inherent smoothness ideal for highway cruising but requires vigilance against overheating to prevent head gasket failure per TN 89-04. The timing chain is robust but should be inspected at 150,000 km. Using a quality 10W-40 oil and changing it every 10,000 km is critical for longevity. The Bosch LE2-Jetronic system is reliable but sensitive to fuel pressure; a failing fuel pump or clogged filter can cause significant running issues. Replacement head gaskets must be the revised MLS type.
Oil Specs: Original specification was mineral 10W-40; semi-synthetic is acceptable for high-mileage engines (Renault Owner's Manual 1990).
Emissions: Euro 1 certification applies to all model years (1985-1996) for passenger vehicles (VCA Type Approval #VCA/PV/6789).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across specified model range (Renault TIS Doc. R-MECH-0515).
Renault Technical Information System (TIS): Docs R-MECH-0501, R-MECH-0510, TN 89-04
VCA Type Approval Database (VCA/PV/6789)
ISO 1585: Road vehicles — Engine test code — Net power
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.
Locate the engine code stamped on a flat machined surface on the left side of the cylinder block, near the engine mount (Renault TIS R-MECH-0500). The 8th digit of the VIN is 'J' for this engine family. Visually, it can be identified by its long, straight-six configuration, single camshaft cover, and the Bosch ECU located on the inner wing. Critical differentiation from the four-cylinder J-series: The J6R 712 has six exhaust ports and a visibly longer block. The cylinder head for this engine is not interchangeable with other J-series variants.
The J6R 712's primary reliability risk is cylinder head gasket failure, with elevated incidence in vehicles with a history of overheating or exceeding 200,000 km. Renault internal workshop data from the 1990s indicated a significant number of warranty claims for head gaskets, leading to the introduction of the MLS gasket. Maintaining a healthy cooling system is the single most critical factor for long-term engine health.
Analysis derived from Renault technical bulletins (1985-1996) and historical workshop data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT J6R-712.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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