The Renault J7T 730 is a 2,068 cc, inline‑four turbo‑diesel engine produced between 1987 and 1996. It features a cast-iron block, a single overhead camshaft (SOHC), and an 8-valve configuration. This engine was a significant step for Renault, being one of its first mass-produced turbo-diesels for passenger cars, offering improved power and torque over its naturally aspirated predecessors.
Fitted primarily to the Renault 21 and Safrane, the J7T 730 was engineered to provide a more refined and powerful diesel option for executive sedans and estates. Emissions compliance for its era was achieved through a conventional indirect injection system and an exhaust gas recirculation (EGR) valve, meeting French and European standards of the late 1980s and early 1990s.
A documented area for attention involves the turbocharger and its associated oil feed/return lines, which are prone to leaks and carbon buildup leading to premature turbo failure, as noted in Renault workshop manuals. The engine's age also means the injection pump requires specific expertise for maintenance and calibration.
Production years 1987–1996 meet applicable French and European emissions standards for passenger vehicles of that era (EU Directive 70/220/EEC as amended).
The Renault J7T 730 is a 2,068 cc inline‑four turbo‑diesel engineered for executive sedans and estates (1987-1996). It combines a robust cast-iron block with indirect injection to deliver a significant torque increase over naturally aspirated units. Designed to meet contemporary late-1980s emissions standards, it prioritized durability and a step-change in diesel 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 | 65 kW (88 PS) | |
| Torque | 180 Nm @ 2,500 rpm | |
| Fuel system | Bosch VE rotary injection pump | |
| Emissions standard | Late 1980s EU Standards | |
| Compression ratio | 22.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T2 (fixed geometry) | |
| Timing system | Belt-driven | |
| Oil type | SAE 15W‑40 mineral | |
| Dry weight | 180 kg |
The turbocharger provides a welcome power boost for highway driving but demands vigilance for oil leaks at the turbo feed and return lines, which can lead to bearing failure. 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 or adjustment. 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 1990). Modern equivalents meeting API 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 11 034 567
EU Commission: Directive 70/220/EEC on emissions
Renault Group Powertrain Specifications (PT-1996)
The Renault J7T 730 was used in Renault's executive platforms with longitudinal mounting. This engine was the top diesel option for the Renault 21 and early Safrane models. All adaptations are documented in OEM technical bulletins.
The engine code 'J7T 730' 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 11 034 567). 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. Service parts are generally compatible across the Renault 21 and Safrane for this specific engine code.
The J7T 730's primary reliability focus is on its turbocharger and timing belt. Renault service data and owner reports consistently highlight turbo oil line leaks 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 (1987-1996) and historical service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT J7T-730.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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