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‑eff…
Production years 1989–1996 meet Euro 1 standards .
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 115 kg |
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.
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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.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the F3P 678 is renowned for its mechanical simplicity and long-term durability when properly maintained. Its cast-iron block is extremely robust. The key to longevity is strict adherence to the 60,000 km timing belt replacement interval. With regular oil changes and basic upkeep, these engines can easily surpass 300,000 km.
The most critical issue is timing belt/tensioner failure, which can destroy the engine. Other frequent problems include a faulty Idle Air Control Valve causing rough idle, worn distributor components leading to misfires, and oil leaks from the valve cover gasket. These are well-documented in Renault service literature.
This 1.7L petrol engine was primarily used in the first-generation Renault Clio (all trims), the Renault 19 (various trims), and the Renault Express/Extra van and passenger variants. It was a mainstay engine for Renault in the early-to-mid 1990s across their compact vehicle range.
Yes, but gains are modest. Simple modifications like a performance air filter, free-flow exhaust, and ECU remapping can yield 5-10 kW. More significant power requires internal work like a higher-lift camshaft or head porting, which is less common due to the engine's SOHC design. It responds well to basic bolt-ons for improved drivability.
Fuel economy is reasonable for its era. In a Renault Clio, expect around 8.5 L/100km (33 mpg UK) in combined driving. The heavier Renault 19 will return figures closer to 9.0-9.5 L/100km (30-29 mpg UK). Real-world consumption is highly dependent on driving style and vehicle condition.
Yes. The F3P 678 is definitively an interference engine. If the timing belt breaks or jumps teeth, the pistons will collide with the open valves, causing severe and expensive internal damage. This makes the 60,000 km timing belt service non-negotiable for engine survival.
Renault recommends a good quality mineral or semi-synthetic 10W-40 engine oil meeting API SG/CC or ACEA A2/B2 specifications. Full synthetic is not necessary. The oil should be changed every 10,000 km or 6 months to ensure engine longevity and proper lubrication.
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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