The Renault F3N 722 is a 1,721 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1996. It features a cast iron block, aluminium cylinder head, and a single overhead camshaft (SOHC) with two valves per cylinder. Output varied by application but typically ranged from 64 kW (87 PS) to 72 kW (98 PS), with torque figures around 140–145 Nm.
Fitted to models such as the R19, Clio, and Express van, the F3N 722 was engineered for dependable, economical everyday transport. Its simple design prioritised ease of maintenance and fuel efficiency over high performance. Emissions compliance for its era was managed through a carburettor or single-point fuel injection and a basic catalytic converter.
One documented concern is premature wear of the camshaft and its followers, particularly if oil changes are neglected. This issue, referenced in Renault technical documentation, can lead to a characteristic tapping noise and reduced performance. The engine received minor updates over its lifespan but was ultimately replaced by the more modern K-series engines.
Production years 1985–1996 meet Euro 1 standards as per applicable regulations for vehicles of that era (VCA UK Type Approval documentation for relevant model years).
The Renault F3N 722 is a 1,721 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and vans (1985-1996). It combines a robust cast iron block with a simple SOHC valvetrain to deliver adequate power for city and highway driving. Designed to meet Euro 1 emissions standards, it prioritises mechanical simplicity and fuel economy over peak performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,721 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 79.5 mm × 87.0 mm | |
| Power output | 64–72 kW (87–98 PS) | |
| Torque | 140–145 Nm @ 2,500–3,500 rpm | |
| Fuel system | Carburettor or Single-point injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 or 15W-40 mineral oil | |
| Dry weight | 115 kg |
The engine provides adequate, if unexciting, performance suitable for its era's compact cars. Regular oil changes every 7,500-10,000 km are critical to prevent accelerated camshaft and follower wear, a known weak point. Using the correct viscosity mineral oil is essential for older seals and components. The simple carburettor or SPI system is generally robust but can suffer from fuel vaporisation in hot weather or require periodic adjustment. Ignition timing should be checked regularly for optimal economy and emissions.
Oil Specs: Requires SAE 10W-40 or 15W-40 mineral oil specification (Renault Owner's Manual). Modern synthetic oils may not be suitable for all seals.
Emissions: Euro 1 certification applies to vehicles manufactured during this period (VCA Type Approval Database for relevant Renault models).
Power Ratings: Measured under DIN 70020 standards. Output varies by specific model application and fuel system (Renault Group PT Archive).
Renault Technical Information System (Workshop Manuals 77 11 060 865, 77 11 060 866)
Renault EPC (Electronic Parts Catalogue)
Renault Owner's Manuals (R19, Clio, Express)
The Renault F3N 722 was used across Renault's R19 and early Clio platforms with transverse mounting. This engine received platform-specific adaptations-slight variations in ancillary brackets and exhaust manifolds between the R19 and Clio-and from 1992 the facelifted R19 models saw minor ECU updates for injected versions. 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 code will read "F3N 722" followed by a serial number. Visually, it is a simple engine with a single cam cover and either a carburettor (early) or a throttle body injection unit (later) on the intake manifold. Differentiate from the F2N (1.4L) by displacement and the F3P (1.8L 16V) by the SOHC 8-valve head. Service parts are generally compatible across all F3N 722 applications, but ancillaries like manifolds may differ.
The F3N 722's primary reliability risk is camshaft and follower wear, with elevated incidence in vehicles subjected to infrequent maintenance. Renault service documentation highlights the importance of oil quality and interval, while owner reports frequently cite carburettor or SPI issues as common causes of drivability problems. Neglecting basic servicing makes addressing wear or fuel system faults critical.
Analysis derived from Renault technical bulletins (1985-1996) and owner-reported failure patterns. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT F3N-722.
Comprehensive technical documentation and regulatory references
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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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