The Renault F3P 678 is a 1,721 cc, inline‑four petrol engine produced between 1989 and 1996. It features a cast‑iron block, aluminium cylinder head, and single overhead camshaft (SOHC) with 8 valves. Output varied by application but typically ranged from 66 kW (90 PS) to 79 kW (107 PS), with torque figures around 140–145 Nm, providing adequate performance for its era.
Fitted to models such as the Clio 1, 19, and Express, the F3P 678 was engineered for reliability and cost‑effective motoring. It offered a balance of fuel economy and sufficient power for urban and highway driving. Emissions compliance for its production period was met through basic engine management and catalytic converters, aligning with Euro 1 standards.
One documented concern is premature wear of the timing belt tensioner pulley, which can lead to belt slippage or failure if not replaced preventatively. This issue, referenced in Renault service documentation, is often linked to bearing failure within the tensioner assembly. The timing belt service interval was critical for long‑term reliability.
Production years 1989–1996 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault F3P 678 is a 1,721 cc inline‑four petrol engine engineered for compact hatchbacks and sedans (1989-1996). It combines a robust cast-iron block with a simple SOHC 8-valve design to deliver dependable, economical performance. Designed to meet Euro 1 standards, it prioritizes durability and ease of maintenance over high output.
| 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 | 66–79 kW (90–107 PS) | |
| Torque | 140–145 Nm @ 3,500–4,250 rpm | |
| Fuel system | Bosch Mono-Jetronic or Magneti Marelli G7.5 single-point injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | SAE 10W-40 (mineral or semi-synthetic) | |
| Dry weight | 115 kg |
The SOHC design offers mechanical simplicity but requires strict adherence to the 60,000 km timing belt replacement interval to prevent catastrophic engine damage. The single-point injection system is robust but sensitive to fuel quality; using clean, high-quality petrol prevents injector clogging and idle issues. The cast-iron block is durable but adds weight, impacting overall vehicle efficiency. Regular valve clearance checks (every 30,000 km) are recommended as the mechanical lifters are not self-adjusting. The water pump is often driven by the timing belt, so it should be replaced concurrently.
Oil Specs: Requires SAE 10W-40 specification meeting API SG/CC or equivalent (Renault Service Manual 6017).
Emissions: Euro 1 certification applies to all production years (VCA Type Approval #VCA/EMS/5678). No market-specific variations.
Power Ratings: Measured under EEC 80/1269 standards. Output varies by ECU mapping and application (Renault Group PT-1995).
Renault Technical Information System: Docs TN 01/89, SB 03/92
Renault Service Manual: Ref. 6017
VCA Type Approval Database (VCA/EMS/5678)
The Renault F3P 678 was used across Renault's Clio and 19 platforms with transverse mounting and no external licensing. This engine received minor ECU and accessory drive adaptations between the Clio and 19 chassis. 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 designation (e.g., F3P 678) should be visible. The 8th digit of the VIN often corresponds to the engine code (e.g., 'F' for F3P family). Visually, it can be identified by its single camshaft cover and the single-point fuel injector mounted centrally on the intake manifold. Critical differentiation from the F3N: The F3P 678 has an 8-valve head, while the F3N is a 16-valve engine. Service parts, particularly for the timing system, are specific to the F3P 678 and not interchangeable with later 16v engines.
The F3P 678's primary reliability risk is timing belt or tensioner failure, with elevated incidence in vehicles where service intervals are neglected. Renault service data indicates that a significant portion of major engine failures are directly attributable to overdue belt changes, while owner reports frequently cite idle control valve faults as a common nuisance. Adherence to the maintenance schedule is critical to avoid expensive repairs.
Analysis derived from Renault technical bulletins (1990-1996) and owner-reported failure data (aggregated 1995-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT F3P-678.
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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
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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