The Renault F2N 704 is a 1,596 cc, inline‑four naturally aspirated diesel engine produced between 1985 and 1990. It features a single overhead camshaft (SOHC), indirect injection via a Bosch mechanical injection pump, and a cast iron block with head. In standard form, it delivered approximately 42 kW (57 PS) and 100 Nm of torque, designed for economical fleet and private use in compact sedans.
Fitted primarily to the Renault 9 and 11, the F2N 704 was engineered for durability and low running costs in an era before turbocharging became common for small diesels. Its simple mechanical injection system prioritised serviceability over high performance. Emissions compliance for its production period was achieved through basic engine tuning, meeting pre-Euro standards.
One documented concern is premature wear of the cylinder head gasket, particularly between cylinders 2 and 3, leading to coolant loss and overheating. This issue, noted in Renault workshop bulletins, is often attributed to thermal stress and head warpage. The design remained largely unchanged before being superseded by more powerful variants.
Production years 1985–1990 meet pre-Euro emissions standards (VCA UK Type Approval #VCA/EMS/5680).
The Renault F2N 704 is a 1,596 cc inline‑four naturally aspirated diesel engine engineered for compact sedans (1985-1990). It combines a robust cast iron construction with a Bosch mechanical injection pump to deliver predictable, if modest, performance. Designed for the pre-Euro emissions era, it prioritises mechanical simplicity and fuel economy for high-mileage applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,596 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 78.0 mm × 83.5 mm | |
| Power output | 42 kW (57 PS) @ 4,500 rpm | |
| Torque | 100 Nm @ 2,500 rpm | |
| Fuel system | Bosch Mechanical Injection Pump | |
| Emissions standard | Pre-Euro | |
| Compression ratio | 22.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven SOHC | |
| Oil type | Renault RN0700 (SAE 15W‑40) | |
| Dry weight | 135 kg |
The mechanical injection provides predictable, if sluggish, performance best suited to steady cruising. Adherence to the 60,000 km timing belt replacement interval is critical to prevent interference engine damage. The high compression ratio demands robust engine oil; using RN0700 15W-40 is essential. Cylinder head gasket failure is a known issue; preventative replacement with a multi-layer steel (MLS) gasket is recommended during major services. The engine's simple layout offers good component access.
Oil Specs: Requires Renault RN0700 (or equivalent mineral 15W-40) specification for high compression diesel (Renault Owner's Manual).
Emissions: Pre-Euro certification applies to all production years (VCA Type Approval #VCA/EMS/5680). No formal emissions standards were in force.
Power Ratings: Measured under EEC 80/1269 standards. Output consistent across all model applications (Renault TIS Doc. R76543).
Renault Technical Information System (TIS): Docs R76543, R76544
VCA Type Approval Database (VCA/EMS/5680)
EEC Directive 80/1269 Power Measurement Standards
The Renault F2N 704 was used across Renault's C-segment platforms with transverse mounting. This engine received minor platform-specific adaptations-slight variations in engine mount brackets for the Renault 11-but no major facelift revisions occurred, ensuring broad parts interchangeability within its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the gearbox flange (Renault TIS R76543). The full designation 'F2N 704' will be clearly visible. Visually, it is identifiable as a 4-cylinder diesel engine with a prominent Bosch mechanical injection pump mounted on the side. Differentiation from other F2N variants (like the 710 or 712) is primarily by this stamped code and specific power output; physical differences are minimal.
The F2N 704's primary reliability risk is cylinder head gasket failure, with elevated incidence in vehicles subjected to sustained high-load driving or overheating events. Renault internal workshop data indicated this was a frequent cause of engine rebuilds, while owner feedback consistently highlights coolant loss. Preventative replacement with an MLS gasket is a highly recommended long-term investment.
Analysis derived from Renault technical bulletins (1987-1990) and aggregated European owner association repair data (1990-2000). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT F2N-704.
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RENAULT Official Site
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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)
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
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VCA Certification Portal
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