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 c…
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Not Available |
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.
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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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The F3N 740 is fundamentally a robust and simple engine. Its long-term reliability heavily depends on consistent maintenance, particularly of the ignition and carburettion systems. With proper care, these engines can easily surpass 200,000 km.
The most frequent issues are distributor wear causing ignition problems, carburettor clogging or leaks, cooling system leaks from hoses or the water pump, and exhaust manifold cracks or gasket failures.
The F3N 740 was primarily used in the Renault R19 (1988-1996) and the first-generation Renault Clio (1991-1994, specific 1.8L variants). It was the 1.8L petrol option for these models.
Minor tuning is possible via carburettor jetting, performance air filters, and exhaust upgrades, yielding modest gains. Significant power increases are limited by the SOHC 8-valve head design and would require major, often uneconomical, modifications.
Real-world fuel economy typically ranges from 7.5 to 9.0 L/100km (31-26 mpg UK) combined, depending on the model, carburettor type, driving style, and condition. Highway driving can yield better figures.
No. The Renault F3N 740 is generally considered a non-interference (or 'free-wheeling') engine. If the timing chain fails, the pistons and valves will not collide, preventing catastrophic internal damage.
Renault typically recommended a 10W-40 or 15W-40 mineral or semi-synthetic oil meeting API SF/CC specifications for the F3N 740. Always consult the specific owner's manual for your vehicle's year.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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