The Renault F3N 702 is a 1,870 cc, inline‑four diesel engine produced between 1986 and 1996. It features a single overhead camshaft (SOHC), indirect injection via pre — chambers, and a cast iron block with an aluminium cylinder head. In standard form, it delivered 46 kW (63 PS) and 120 Nm of torque, designed for Renault's compact and mid — size vehicles.
Fitted primarily to the R9, R11, and Nevada, the F3N 702 was engineered for dependable, economical motoring with a focus on lo…
Pre-Euro emissions compliance .
The Renault F3N 702 is a 1,870 cc inline‑four diesel engine engineered for compact family cars (1986-1996). It combines indirect injection with a simple SOHC valvetrain to deliver rugged durability and excellent fuel economy. Designed for pre-Euro standards, it prioritises mechanical simplicity and low-cost ownership.
| 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 | 46 kW (63 PS) @ 4,500 rpm | |
Torque | 120 Nm @ 2,500 rpm | |
Fuel system | Indirect injection (Bosch VE rotary pump) | |
Emissions standard | Pre-Euro | |
Compression ratio | 22.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 120 kg |
The Renault F3N 702 was used exclusively across Renault's B/C-segment platforms with transverse mounting and no external licensing. This engine received minor platform-specific adaptations-different engine mounts for the R9 and Nevada-but no major facelift revisions affecting core interchangeability during its production run. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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Yes, the F3N 702 is renowned for its rugged simplicity and exceptional longevity. Its main weakness is the mechanical injection pump's diaphragm, which requires specialist attention at high mileage. With this addressed and regular maintenance (oil changes, glow plugs), these engines can easily surpass 300,000 km. Its non-interference design also makes it very forgiving.
The most frequent issues are degradation of the Bosch VE injection pump diaphragm (causing leaks and running problems), failing glow plugs (hard cold starts), stretched timing chains (rattling noise), and eventual head gasket failure on very high-mileage engines. These are all well-documented in Renault service literature and are typical for engines of this vintage.
The F3N 702 was used in the Renault R9 (1986-1989), Renault R11 (1986-1989), and the Renault Nevada estate (1986-1996). It was the standard 1.9-litre diesel engine for these models during that era.
Significant power gains are not practical. Minor improvements can be made by ensuring the injection pump is perfectly calibrated and by fitting a free-flow exhaust. Its indirect injection and low power output are designed for economy and durability, not performance. Tuning is generally not recommended.
Exceptional for its time. In a Renault R9, expect real-world figures of around 5.5-6.0 L/100km (47-51 mpg UK) on mixed driving. Its indirect injection and low power output make it incredibly frugal, especially at steady cruising speeds, which was its primary design goal.
No. The F3N 702 is a non-interference engine. This means if the timing chain were to fail or jump, the pistons will not contact the valves. While a broken chain will stop the engine, it prevents catastrophic internal damage, making it very robust and forgiving.
Renault specifies a 15W-40 mineral oil meeting the RN0700 standard, or an ACEA B2 equivalent. Regular oil changes (every 10,000-15,000 km) are crucial for longevity, especially given the engine's high compression ratio and mechanical injection pump. Using a heavier oil like 20W-50 in hot climates is also acceptable.
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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