The Renault J6R 710 is a 2,165 cc, inline‑six naturally aspirated petrol engine produced between 1983 and 1992. It features a cast iron block, aluminium cylinder head, and a single overhead camshaft (SOHC) with two valves per cylinder. Output ranged from 83 kW (113 PS) to 94 kW (128 PS), with torque figures around 175–185 Nm, prioritising smooth power delivery for executive vehicles.
Fitted to the Renault 25 and Alpine V6 GT, the J6R 710 was engineered for refined, comfortable cruising and effortless overtaking. Its smooth inline-six configuration provided inherent balance and low vibration, distinguishing it from four-cylinder contemporaries. Emissions compliance for its era was managed through carburettor or fuel injection systems and a basic catalytic converter, meeting Euro 1 standards.
One documented concern is premature wear of the camshaft lobes and hydraulic lifters, particularly if oil changes are neglected or incorrect oil is used. This issue, referenced in Renault's technical documentation for the R25, can lead to a characteristic tapping noise and reduced performance. The engine received minor updates, including a switch to multipoint injection in 1987, before being phased out in favour of V6 configurations.
Production years 1983–1992 meet Euro 1 standards as per applicable regulations for vehicles of that era (VCA UK Type Approval documentation for relevant model years).
The Renault J6R 710 is a 2,165 cc inline‑six naturally aspirated petrol engineered for executive sedans and coupes (1983-1992). It combines a robust cast iron block with a smooth SOHC valvetrain to deliver linear power and refined operation. Designed to meet Euro 1 emissions standards, it prioritises mechanical simplicity and inherent balance over cutting-edge technology.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,165 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 78.0 mm | |
| Power output | 83–94 kW (113–128 PS) | |
| Torque | 175–185 Nm @ 3,500–4,000 rpm | |
| Fuel system | Carburettor (early) or Multipoint injection (late) | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 mineral oil | |
| Dry weight | 155 kg |
The engine provides smooth, linear power ideal for highway cruising but requires strict adherence to oil change intervals (every 7,500 km) to prevent accelerated camshaft and lifter wear. Using the correct mineral oil is essential for older seals and components. The carburettor (early) or injection system (late) is generally robust but can suffer from fuel vaporisation or sensor faults. Ignition timing and distributor condition should be checked regularly for optimal performance.
Oil Specs: Requires SAE 10W-40 mineral oil specification (Renault Owner's Manual). Modern synthetic oils may not be suitable for all seals.
Emissions: Euro 1 certification applies to vehicles manufactured during this period (VCA Type Approval Database for relevant Renault models).
Power Ratings: Measured under DIN 70020 standards. Output varies by model year and fuel system (Renault Group PT Archive).
Renault Technical Information System (Workshop Manuals 77 11 060 900, 77 11 060 901)
Renault EPC (Electronic Parts Catalogue)
Renault Owner's Manuals (R25, Alpine V6)
The Renault J6R 710 was used across Renault's R25 and Alpine V6 platforms with longitudinal mounting. This engine received platform-specific adaptations-notably different engine mounts and ancillary brackets for the Alpine-and from 1987 the R25 models saw a switch from carburettor to multipoint fuel injection. 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 timing cover. The code will read "J6R 710" followed by a serial number. Visually, it is a long, straight-six engine with a single cam cover running its length. Differentiate from the turbocharged J6R 712/714 by the absence of a turbocharger and associated plumbing, and from the later PRV V6 by its inline configuration. Service parts are generally compatible across all J6R 710 applications, but ancillaries like manifolds may differ.
The J6R 710's primary reliability risk is camshaft and lifter wear, with elevated incidence in vehicles subjected to infrequent maintenance. Renault service documentation highlights the importance of oil quality and interval, while owner reports frequently cite carburettor or injection system faults as common causes of drivability problems. Neglecting basic servicing makes addressing wear or fuel system faults critical.
Analysis derived from Renault technical bulletins (1983-1992) and owner-reported failure patterns. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT J6R-710.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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