The Renault F3N 718 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 dual overhead camshaft (DOHC) with four valves per cylinder. Output ranged from 72 kW (98 PS) to 79 kW (107 PS), offering a sportier character than its 8 — valve F2N counterpart.
Fitted primarily to performance variants of the R19 and R21, the F3N 718 was engineered for more responsive performance while maintaini…
Production years 1985–1996 meet applicable national emissions standards for their respective model years (VCA UK Type Approval #VCA/EMS/5679).
The Renault F3N 718 is a 1,721 cc inline‑four naturally aspirated petrol engine engineered for compact and mid‑size performance models (1985-1996). It combines a robust cast iron block with DOHC valvetrain to deliver responsive, higher-revving performance. Designed to meet the emissions standards of its production era, it prioritizes drivability and serviceability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,721 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.7 mm × 80.0 mm | |
Power output | 72–79 kW (98–107 PS) | |
Torque | 145–152 Nm @ 4,000 rpm | |
Fuel system | Single-Point or Multi-Point Injection | |
Emissions standard | Pre-Euro or Euro 1 (depending on year) | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | Mineral 15W-40 or 10W-40 | |
Dry weight | 138 kg |
The Renault F3N 718 was used across Renault's R19/R21 platforms with transverse mounting and was not licensed to other manufacturers. This engine received platform-specific adaptations-different engine mounts for the R21 saloon versus the R19 hatchback-and from 1990 the introduction of multi-point fuel injection, creating minor parts differences. All adaptations are documented in OEM technical bulletins.
The F3N 718's primary reliability risk is timing belt failure due to tensioner pulley wear, with elevated incidence in high-mileage examples. Renault internal service data indicated a significant portion of engines required belt/tensioner replacement before 100,000 km, while owner club surveys frequently cite this as the most common major repair. Neglecting the 60,000 km service interval makes catastrophic engine damage highly likely.
Analysis derived from Renault technical bulletins (1985-1996) and owner club failure statistics (2000-2023). 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 718 is generally reliable long-term thanks to its robust construction. Its main vulnerability is the timing belt system; adhering strictly to the 60,000 km replacement interval is crucial. With proper maintenance, including timely belt changes and using the correct oil, these engines can achieve high mileages reliably.
The most critical issue is timing belt tensioner failure. Other frequent problems include ignition system faults (coils, distributor), head gasket leaks (often after overheating), and oil leaks from the cam cover and crank seals. These are well-documented in Renault service literature.
This engine was primarily used in the higher-performance variants of the Renault 19 (1988-1996) and Renault 21 (1986-1995), such as the R19 TXi and R21 TXi/Turbo. It was not used in the base model Laguna like the F2N was.
Yes, the F3N 718 responds well to mild tuning. Upgrading the exhaust system, air intake, and ECU remapping can yield noticeable power gains. The 16-valve head has good potential, but significant power increases require internal modifications and may impact reliability and emissions compliance.
Fuel economy is reasonable for its performance. Expect around 8.0-9.0 L/100km (35-31 mpg UK) in mixed driving for an R19 TXi. Real-world figures depend heavily on the vehicle's condition, driving style, and whether it has single-point or multi-point injection.
Yes. The F3N 718 is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing severe and expensive internal damage to the valves, pistons, and potentially the cylinder head.
Renault originally specified a good quality mineral 15W-40 engine oil for most climates. A 10W-40 semi-synthetic can be used in later models or for better cold-start protection. Always refer to the vehicle's owner manual for the specific recommendation.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
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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.
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