The Renault J6R 734 is a 2,165 cc, inline‑six petrol engine produced between 1980 and 1989. It features a cast — iron block, an aluminium cylinder head with a single overhead camshaft (SOHC), and a carburetted fuel system. In standard form, it delivered approximately 83 kW (113 PS), designed for smooth, torquey performance in Renault's executive sedans.
Fitted primarily to the Renault 20/30 TS and GTX models, the J6R 734 was engineered for refined, effortless cruising and…
Production years 1980–1989 meet applicable French and European emissions standards for passenger vehicles of that era (no centralized VCA-type approval existed for this period).
The Renault J6R 734 is a 2,165 cc inline‑six petrol engine engineered for executive sedans (1980-1989). It combines a robust cast-iron block with a single overhead camshaft and carburetted fuel delivery to deliver smooth, linear power. Designed for its era, it prioritizes durability and refinement over modern emissions or fuel economy targets.
| 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 | 83 kW (113 PS) | |
Torque | 172 Nm @ 3,500 rpm | |
Fuel system | Single-barrel carburettor (Solex) | |
Emissions standard | Applicable 1980s French/European standards | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 15W-40 mineral oil | |
Dry weight | 185 kg |
The Renault J6R 734 was used exclusively in Renault's R20/R30 platform with longitudinal mounting. This engine received minor platform-specific adaptations-reinforced engine mounts for the heavier R30-but no major revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
The J6R 734's primary reliability concern is wear of the timing chain and tensioner, with elevated incidence in vehicles subjected to extended oil change intervals. Renault Technical Note 3321D documents this issue, while owner reports frequently cite carburettor-related drivability problems. Adhering to the specified maintenance schedule is critical for long-term reliability.
Analysis derived from Renault technical bulletins (1980-1989) and owner club technical archives. Repair procedures should follow manufacturer guidelines.
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The J6R 734 is a robust and durable engine when maintained correctly. Its primary long-term concern is the timing chain and tensioner, which require strict adherence to the 10,000 km oil change interval. Addressing this and performing regular carburettor maintenance ensures excellent long-term reliability and smooth operation.
The most frequently documented issues are timing chain and tensioner wear (addressed in SIB 3321D), carburettor-related drivability problems (flooding, hesitation), coolant leaks from hoses or the water pump, and oil leaks from the valve cover or rear main seal. These are well-covered in Renault's technical documentation.
The J6R 734 2.2L petrol engine was used in the Renault 20 TS/GTX (1980-1986) and the Renault 30 TS/GTX (1980-1989). It was not used in any other manufacturers' vehicles.
Yes, the J6R 734 can be modified for more power. Common upgrades include fitting a twin-choke carburettor, performance exhaust manifold, and a free-flow exhaust system. More advanced tuning involves porting the cylinder head and fitting a performance camshaft. Significant power gains require substantial modification.
Official figures are not readily available, but real-world consumption for the Renault 30 GTX is typically around 11-14 L/100km (26-20 mpg UK) in mixed driving. Highway cruising can yield figures closer to 9-10 L/100km (31-28 mpg UK). Fuel economy is heavily influenced by the condition of the carburettor and driving style.
Yes. The J6R 734 is an interference design. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing severe internal engine damage. This makes regular inspection and replacement of the timing components critical.
Renault originally specified SAE 15W-40 mineral oil for the J6R 734. While modern semi-synthetic oils of the same viscosity can be used and may offer better protection, it is crucial to avoid very thin modern synthetics (like 0W-20) which may not be suitable for the engine's older bearing clearances and seals.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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.
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