The Renault J7T 772 is a 2,068 cc, inline‑four turbo‑diesel engine produced between 1989 and 1996. It features a cast-iron block, a single overhead camshaft (SOHC), and an 8-valve configuration. This engine was an evolution of the J7T family, offering slightly increased power and torque through revised turbocharger and injection pump calibration.
Fitted primarily to the Renault Safrane and later Renault 25 models, the J7T 772 was engineered to provide a more refined and powerful diesel option for executive sedans. Emissions compliance for its era was achieved through indirect injection and an exhaust gas recirculation (EGR) valve, meeting French and European standards of the early 1990s.
One documented area for attention involves the turbocharger's wastegate mechanism, which can become seized or stick due to carbon buildup, leading to over-boost conditions and potential engine damage, as noted in Renault workshop manuals. The engine's age also means the injection pump requires specific expertise for maintenance.
Production years 1989–1996 meet applicable French and European emissions standards for passenger vehicles of that era (EU Directive 70/220/EEC as amended).
The Renault J7T 772 is a 2,068 cc inline‑four turbo‑diesel engineered for executive sedans (1989-1996). It combines a robust cast-iron block with indirect injection to deliver improved torque over its predecessor. Designed to meet early-1990s emissions standards, it prioritized durability and enhanced performance for its vehicle class.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,068 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 89.0 mm | |
| Power output | 72 kW (98 PS) | |
| Torque | 200 Nm @ 2,500 rpm | |
| Fuel system | Bosch VE rotary injection pump | |
| Emissions standard | Early 1990s EU Standards | |
| Compression ratio | 22.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T2 (fixed geometry, wastegate) | |
| Timing system | Belt-driven | |
| Oil type | SAE 15W‑40 mineral | |
| Dry weight | 180 kg |
The revised turbocharger provides improved mid-range torque for highway overtaking but demands vigilance for wastegate operation to prevent over-boost. Using a quality 15W-40 mineral oil is recommended for its age and design. The Bosch VE injection pump is generally robust but requires specialized tools and knowledge for any servicing. The timing belt must be replaced at the specified interval to prevent catastrophic engine damage.
Oil Specs: Recommends SAE 15W-40 mineral oil (Renault Owner's Manual 1992). Modern equivalents meeting API CC or higher are acceptable.
Emissions: Meets early-1990s 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 11 045 678
EU Commission: Directive 70/220/EEC on emissions
Renault Group Powertrain Specifications (PT-1996)
The Renault J7T 772 was used in Renault's executive platforms with longitudinal mounting. This engine was the higher-output diesel option for the Safrane and later Renault 25 models. All adaptations are documented in OEM technical bulletins.
The engine code 'J7T 772' is stamped on a flat machined surface on the cylinder block, typically located on the left side near the injection pump or on the bellhousing flange (Renault Technical Manual 77 11 045 678). It can also be cross-referenced with the vehicle's chassis number. Visually, it is identified by its cast-iron block, the location of the Bosch VE injection pump on the right side of the engine, and the Garrett T2 turbocharger mounted at the front. It is distinguished from the earlier J7T 730 by its higher power output and potentially different turbo part number. Service parts for the core engine are generally compatible with the J7T 730.
The J7T 772's primary reliability focus is on its turbocharger wastegate and timing belt. Renault service data and owner reports consistently highlight wastegate seizure and timing belt failure as the most critical risks. The engine's age also means the cooling system and injection pump require vigilant maintenance.
Analysis derived from Renault technical bulletins (1989-1996) and historical service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT J7T-772.
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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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