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 everyd…
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 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.
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.
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The F3N 722 is fundamentally robust but longevity heavily depends on maintenance. Its main weakness is camshaft wear if oil changes are neglected. With strict adherence to service schedules using correct oil, these engines can easily surpass 200,000 km. Simplicity aids repairability.
The most frequent issues are camshaft/follower wear (causing noise), carburettor or SPI fuel system faults (causing running problems), cooling system leaks, and ignition system component failure. These are well-documented in Renault service literature.
This 1.7L petrol engine was primarily used in the Renault R19 (1988-1996), the first-generation Clio (1990-1994), and the Renault Express/Extra van (1985-1994). It powered base and mid-level trims like the RN, RT, and RL.
Minor tuning is possible. Upgrades like a performance exhaust, high-flow air filter, or carburettor re-jetting can yield small gains. Significant power increases are difficult due to the SOHC 8-valve design. It's better suited to reliability than tuning.
Fuel economy is reasonable for its era. Expect around 7.5-8.5 L/100km (33-38 mpg UK) combined for a manual gearbox car. City driving will be higher (9-10 L/100km), while highway cruising can drop to 6.5-7 L/100km (40-43 mpg UK).
No. The F3N 722 is a non-interference engine. If the timing chain were to fail, the pistons and valves would not collide, preventing catastrophic internal damage. However, the engine will still stop running and require repair.
Renault specified a mineral-based SAE 10W-40 or 15W-40 engine oil for the F3N 722. While modern semi-synthetics meeting the same viscosity may be used, sticking to the manufacturer's recommendation is safest for older seals. Change every 7,500 km.
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
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