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 co…
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 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 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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The J7R 752 is a fundamentally robust and smooth engine, typical of its era. Its long-term reliability is heavily dependent on preventative maintenance, especially the critical timing belt replacement. With meticulous care and timely servicing of its ancillary systems, it can be very reliable. Neglect, particularly of the timing belt, will lead to expensive failure.
The most critical issue is timing belt failure, which causes catastrophic engine damage. Other common problems include leaks and corrosion in the aging cooling system, faults in the Bosch LE-Jetronic fuel injection system (injectors, AFM), and wear in the distributor-based ignition system (cap, rotor, leads).
The J7R 752 engine was used exclusively in the facelifted (Phase 2) Renault 25 sedan (1987-1992), where it was the top petrol engine, badged as the '2.2 Injection'.
Yes, but it's not common. Modifications are typically limited to improving breathing with a performance exhaust or air filter, and re-jetting or remapping the fuel injection. Significant power gains would require forced induction or internal modifications, which are complex and costly for this vintage engine.
Fuel economy is typical for a 2.2L inline-six from the late 1980s. Expect figures between 9.5 - 12.5 L/100km (22 - 30 mpg UK) for combined driving. Highway cruising might yield around 8.5 L/100km (33 mpg UK), while city driving will be less efficient, often exceeding 13.5 L/100km.
Yes. The J7R 752 is an interference engine. If the timing belt fails or jumps, the pistons will collide with the open valves, causing severe internal engine damage. This makes adhering to the timing belt replacement schedule absolutely critical.
Renault originally specified a SAE 10W-40 mineral or semi-synthetic oil. For a well-maintained vintage engine, a high-quality 10W-40 or 15W-40 mineral oil meeting API SG/CC or higher specifications is suitable. Modern semi-synthetics can also be used if they meet the viscosity requirement.
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
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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