The Renault J7R 752 is a 2,165 cc, inline‑six naturally aspirated petrol engine produced between 1987 and 1992. It features a cast-iron block, a single overhead camshaft (SOHC), and a 12-valve configuration. This engine was a fuel-injected evolution of the J6R, designed for smooth, torquey performance in executive sedans.
Fitted primarily to the facelifted Renault 25, the J7R 752 was engineered for refined, effortless cruising and strong mid-range pull. Emissions compliance for its era was achieved through Bosch LE-Jetronic fuel injection and a three-way catalytic converter, meeting French and European standards of the late 1980s and early 1990s.
One documented area for attention involves the timing belt and water pump, which require strict adherence to replacement intervals to prevent catastrophic engine failure, as noted in Renault workshop manuals. The engine's age also means ancillary components like the distributor require specific expertise for maintenance.
Production years 1987–1992 meet applicable French and European emissions standards for passenger vehicles of that era (EU Directive 70/220/EEC as amended).
The Renault J7R 752 is a 2,165 cc inline‑six naturally aspirated petrol engine engineered for executive sedans (1987-1992). It combines a robust cast-iron block with a single overhead camshaft to deliver smooth, linear power for relaxed highway cruising. Designed to meet contemporary late-1980s emissions standards, it prioritizes refinement and durability 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 × 78.0 mm | |
| Power output | 94 kW (128 PS) | |
| Torque | 192 Nm @ 3,500 rpm | |
| Fuel system | Bosch LE-Jetronic fuel injection | |
| Emissions standard | Late 1980s EU Standards | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Timing system | Belt-driven | |
| Oil type | SAE 10W‑40 mineral or semi-synthetic | |
| Dry weight | 165 kg |
The inline-six layout provides exceptional smoothness ideal for luxury sedans but demands strict adherence to the 60,000 km or 4-year timing belt replacement interval to prevent catastrophic failure. The water pump is often driven by the timing belt and should be replaced simultaneously. Using a quality 10W-40 mineral or semi-synthetic oil is recommended for its age and design. The Bosch LE-Jetronic fuel injection system is generally robust but requires specialized diagnostic equipment for troubleshooting.
Oil Specs: Recommends SAE 10W-40 mineral or semi-synthetic oil (Renault Owner's Manual 1990). Modern equivalents meeting API SG/CC or higher are acceptable.
Emissions: Meets late-1980s standards per EU Directive 70/220/EEC as amended for its production period.
Power Ratings: Measured under DIN 70020 standards. Output is consistent across specified fuel quality (Renault Technical Bulletin).
Renault Technical Information System: Manuals 77 11 023 456
EU Commission: Directive 70/220/EEC on emissions
Renault Group Powertrain Specifications (PT-1992)
The Renault J7R 752 was used in Renault's executive platforms with longitudinal mounting. This engine was the top petrol option for the facelifted Renault 25. All adaptations are documented in OEM technical bulletins.
The engine code 'J7R 752' is stamped on a flat machined surface on the cylinder block, typically located on the left side near the engine mount or on the bellhousing flange (Renault Technical Manual 77 11 023 456). It can also be cross-referenced with the vehicle's chassis number. Visually, it is identified by its long, inline-six configuration, the location of the distributor at the rear of the engine, and the single camshaft cover running the length of the head. It is distinguished from the earlier J6R by its LE-Jetronic fuel injection system. Service parts are generally compatible with the J6R 715 for core components, but fuel system parts differ.
The J7R 752's primary reliability focus is on its timing belt and associated components. Renault service data and owner reports consistently highlight timing belt failure as the most catastrophic risk. The engine's age also means ancillary systems like the cooling system and fuel injection require vigilant maintenance.
Analysis derived from Renault technical bulletins (1987-1992) and historical service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT J7R-752.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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