The Renault F3N 742 is a 1,870 cc, inline‑four naturally aspirated diesel engine produced between 1987 and 1996. It features a cast iron block and head, with a single overhead camshaft (SOHC) and two valves per cylinder. This mechanically simple, indirect injection design prioritised durability and ease of maintenance for Renault's volume models.
Fitted primarily to the R19 and Express van, the F3n 742 was engineered for economical, torque-focused urban and highway driving. Its mechanical Bosch injection pump and lack of complex emissions controls made it a straightforward, reliable powerplant for its time. It was designed to meet the prevailing emissions standards of the late 1980s and early 1990s.
One documented area for attention is the cylinder head, particularly on higher-mileage examples subjected to overheating. Cracking between valve seats or at the injector boss was noted in service documentation, often linked to coolant system neglect or overheating events. Renault service bulletins detail inspection procedures and specify revised head castings for replacement.
Production years 1987–1996 meet applicable French and EU emissions standards for their respective model years (EU Directive 88/77/EEC).
The Renault F3N 742 is a 1,870 cc inline‑four naturally aspirated diesel engine engineered for compact hatchbacks, saloons, and light commercial vehicles (1987-1996). It combines a simple SOHC valvetrain with indirect injection and a mechanical fuel pump to deliver dependable, torquey performance. Designed to meet the emissions standards of its production era, it prioritises mechanical simplicity and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,870 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 80.0 mm × 93.0 mm | |
| Power output | 43–47 kW (58–64 PS) | |
| Torque | 120–130 Nm @ 2,500 rpm | |
| Fuel system | Bosch mechanical indirect injection pump | |
| Emissions standard | EU Directive 88/77/EEC (and national variants) | |
| Compression ratio | 22.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | Mineral 15W-40 diesel specification | |
| Dry weight | Not Available |
The high compression ratio and indirect injection provide strong low-end torque ideal for city driving and light towing, but with modest peak power. Regular oil changes with the correct diesel-rated mineral oil are critical for engine longevity. The mechanical injection pump is robust but requires precise timing adjustment if serviced. The documented cylinder head cracking issue means replacements should use the latest revised OEM casting. Avoiding overheating through diligent cooling system maintenance is paramount.
Oil Specs: Requires API CC/CD or equivalent mineral diesel engine oil (Renault Owner's Manual). 15W-40 is standard for temperate climates.
Emissions: Certification based on EU Directive 88/77/EEC for light-duty vehicles. Specific national homologation numbers vary by market.
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across applications due to mechanical pump calibration (Renault PT-1995).
Renault Technical Workshop Manuals (Refs: 77 11 061 125, 77 11 061 126)
Renault EPC (Electronic Parts Catalogue) Archive
Renault Owner's Manuals (R19, Express)
EU Directive 88/77/EEC on emissions
The Renault F3N 742 was used across Renault's R19 platform with transverse mounting. This engine received minor revisions to the cylinder head casting and gasket design throughout its production run to address cracking issues, creating subtle differences in parts compatibility. 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 code (e.g., F3N 742) should be visible. The 8th digit of the VIN typically corresponds to the engine type for Renault vehicles of this era. Visually, the engine can be identified by its single overhead camshaft cover and the presence of a Bosch mechanical injection pump on the side of the engine block. Differentiate from the F8M (1.6L diesel) by displacement and physical size, and from the F3N 740 (petrol) by the presence of the injection pump instead of a carburettor.
The F3N 742's primary reliability concern is cylinder head cracking, particularly on vehicles with a history of overheating. Renault internal service data indicated this was a significant cause of engine failure in the early 1990s. Diligent cooling system maintenance and using the correct revised cylinder head during replacement are critical for long-term reliability.
Analysis derived from Renault technical bulletins (1987-1996) and owner workshop manual data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT F3N-742.
Comprehensive technical documentation and regulatory references
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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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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