The Renault F3N 740 is a 1,721 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1996. It features a cast iron block, aluminium head, and a single overhead camshaft (SOHC) with two valves per cylinder. This robust design prioritised durability and ease of maintenance for Renault's volume models of the era.
Fitted primarily to the R19 and early Clio models, the F3N 740 was engineered for economical, reliable urban and highway driving. Its simple carburetted fuel system and lack of complex emissions controls made it a straightforward powerplant for its time. It was designed to meet the prevailing emissions standards of the late 1980s and early 1990s.
One documented area for attention is the distributor and ignition system, particularly on higher-mileage examples. Wear in the distributor shaft bushings or the mechanical advance mechanism can lead to timing inaccuracies and running issues. Renault service documentation from the period details procedures for inspection and replacement of these components.
Production years 1985–1996 meet applicable French and EU emissions standards for their respective model years (EU Directive 88/77/EEC).
The Renault F3N 740 is a 1,721 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and saloons (1985-1996). It combines a simple SOHC valvetrain with carburetted fuel delivery to deliver dependable, economical performance. Designed to meet the emissions standards of its production era, it prioritises mechanical simplicity and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,721 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 80.0 mm × 86.0 mm | |
| Power output | 55–66 kW (75–90 PS) | |
| Torque | 130–140 Nm @ 3,000–3,500 rpm | |
| Fuel system | Single-barrel or twin-barrel carburettor (Solex or Weber) | |
| Emissions standard | EU Directive 88/77/EEC (and national variants) | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | Mineral or semi-synthetic 10W-40 or 15W-40 | |
| Dry weight | Not Available |
The simple SOHC design offers good low-end torque for city driving but lacks the high-RPM refinement of later engines. Regular ignition system maintenance (distributor cap, rotor, points/condenser or electronic module, spark plugs) is critical for smooth running. Using the correct grade of petrol and periodic carburettor cleaning/synchronisation are essential for optimal performance and fuel economy. The timing chain is generally robust but should be inspected for wear and tension during major services. Pre-1992 models may use leaded petrol specifications; post-1992 models are designed for unleaded.
Oil Specs: Requires API SF/CC or equivalent mineral/semi-synthetic oil (Renault Owner's Manual). Viscosity depends on climate (10W-40 recommended for temperate zones).
Emissions: Certification based on EU Directive 88/77/EEC for light-duty vehicles. Specific national homologation numbers vary by market.
Power Ratings: Measured under EEC 80/1269 standards. Output varies by specific carburettor type and model application (Renault PT-1995).
Renault Technical Workshop Manuals (Refs: 77 11 061 123, 77 11 061 124)
Renault EPC (Electronic Parts Catalogue) Archive
Renault Owner's Manuals (R19, Clio)
EU Directive 88/77/EEC on emissions
The Renault F3N 740 was used across Renault's R19 platform with transverse mounting. This engine received minor carburettor and ignition system revisions throughout its production run, creating subtle differences in tuning and emissions compliance. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the gearbox flange. The full code (e.g., F3N 740) should be visible. The 8th digit of the VIN typically corresponds to the engine type for Renault vehicles of this era. Visually, the engine can be identified by its single overhead camshaft cover and the presence of a carburettor (either Solex or Weber) on the intake manifold. Differentiate from the F3P (1.4L) and F3R (2.0L) by displacement and physical size.
The F3N 740's primary reliability concerns are related to its ageing ignition and fuel delivery systems. Wear in the distributor and carburettor components is common on high-mileage examples, leading to running issues. Regular maintenance of these systems is critical for dependable operation.
Analysis derived from Renault technical bulletins (1985-1996) and owner workshop manual data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT F3N-740.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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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