The Renault B1B 707 is a 1,397 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1996. It features a single overhead camshaft (SOHC) design with two valves per cylinder and a carbureted fuel system in early variants, later transitioning to single — point injection. In standard form, it delivered approximately 55 kW (75 PS), providing adequate performance for its lightweight supermini applications.
Fitted primarily to the Renault 5 (Supercin…
Production years 1985–1992 meet pre-Euro standards; 1993–1996 models meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/2345).
The Renault B1B 707 is a 1,397 cc inline‑four naturally aspirated petrol engine engineered for supermini applications (1985-1996). It combines a simple SOHC valvetrain with carburetion or single-point injection to deliver reliable, economical performance. Designed to meet pre-Euro and later Euro 1 standards, it prioritizes serviceability and low running costs.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,397 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.8 mm × 77.0 mm | |
Power output | 55 kW (75 PS) | |
Torque | 105 Nm @ 3,500 rpm | |
Fuel system | Carburetor / Single-point injection (SPI) | |
Emissions standard | Pre-Euro (1985–1992); Euro 1 (1993–1996) | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshaft | |
Oil type | API SG/CC (e.g., SAE 15W‑40) | |
Dry weight | Not specified in available OEM docs |
The Renault B1B 707 was used across Renault's Supercinq platform with transverse mounting. This engine received no major platform-specific adaptations during its production run. All applications are documented in OEM technical bulletins.
The B1B 707's primary reliability risk is timing belt tensioner failure, with elevated incidence in vehicles with neglected maintenance. Renault internal service data indicates this is the most common cause of timing belt-related breakdowns, while its failure often leads to expensive engine damage. Adherence to the 80,000 km belt and tensioner replacement interval is critical for preventing catastrophic failure.
Analysis derived from Renault technical bulletins (1985-1996) 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 B1B 707 is fundamentally simple and robust, making it potentially very reliable long-term. Its Achilles' heel is the timing belt tensioner. With strict adherence to the 80,000 km/4-year belt and tensioner replacement schedule, these engines can easily surpass 200,000 km. Neglecting this interval is the primary cause of catastrophic engine failure.
The most critical problem is timing belt tensioner pulley failure, which can destroy the engine if ignored. Other common issues include carburetor maladjustment or SPI idle control valve failure causing running problems, ignition system component wear leading to misfires, and coolant leaks from aging hoses or the water pump.
The B1B 707 engine was used in the Renault 5 (Supercinq) from 1985 to 1996 and the Renault Express van from 1986 to 1993. It was the standard 1.4L petrol engine for these models throughout their production runs.
Minor tuning is possible but yields limited gains due to the engine's SOHC, 8-valve design. Options include fitting a performance carburetor or throttle body, a free-flow exhaust, and a modified camshaft. Significant power increases are not practical or cost-effective; the engine is best suited to its original economy-focused role.
Fuel economy is good for its era. Expect approximately 6.5-7.5 L/100km (38-43 mpg UK) in combined driving for a Renault 5. Real-world figures are heavily influenced by driving style, vehicle condition, and whether the engine is carbureted or uses single-point injection. SPI models are generally slightly more economical.
Yes. The B1B 707 is an interference engine. If the timing belt breaks or slips, the pistons will collide with the open valves, causing severe internal damage that typically requires a cylinder head rebuild or engine replacement. This makes the 80,000 km/4-year belt and tensioner change interval absolutely critical.
Renault specifies an oil meeting API SG/CC standards. A good quality 15W-40 mineral oil is perfectly adequate and was the standard recommendation for this engine. There is no need for synthetic oil, as the engine operates at relatively low stresses and temperatures.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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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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