The Renault J7R 750 is a 2,165 cc, inline‑six petrol engine produced between 1987 and 1996. It features a single overhead camshaft (SOHC), two valves per cylinder, and multipoint fuel injection. This engine typically produced 88 kW (120 PS) and 181 Nm of torque, engineered for smooth, linear power delivery in executive sedans.
Fitted primarily to the Renault 25 and Safrane, the J7R 750 was designed to offer refined, effortless cruising and strong mid — range pull for highwa…
All production years (1987–1996) meet Euro 1 standards for passenger vehicles (VCA UK Type Approval #VCA/PV/6790).
The Renault J7R 750 is a 2,165 cc inline‑six petrol engine engineered for executive sedans (1987-1996). It combines a simple SOHC valvetrain with multipoint 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 | 88 kW (120 PS) | |
Torque | 181 Nm @ 3,500 rpm | |
Fuel system | Bosch LE3-Jetronic multipoint injection | |
Emissions standard | Euro 1 | |
Compression ratio | 9.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 10W‑40 mineral or semi-synthetic | |
Dry weight | 168 kg |
The Renault J7R 750 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.
The J7R 750'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 (1987-1996) 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 J7R 750 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 LE3-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 J7R 750 was used in the Renault 25 (B29) from 1987 to 1992 and its successor, the Renault Safrane (B54), from 1992 to 1996. It was the higher-specification six-cylinder petrol engine for these executive models, badged as the '2.2 Injection'.
While not a common tuning candidate today, the J7R 750 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 LE3-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 late 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 J7R 750 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.
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