The Renault C3G 702 is a 1,239 cc, inline‑four petrol engine produced between 1985 and 1996. It features a single overhead camshaft (SOHC) and two valves per cylinder, prioritising mechanical simplicity and cost — effective maintenance. In standard form, it delivered approximately 44 kW (60 PS), providing adequate performance for lightweight city cars of its era.
Fitted primarily to the Renault 5 (Super 5) and early Clio I models, the C3G 702 was engineered for economy an…
Production years 1985–1996 predate formal Euro emissions standards. Compliance was governed by national regulations applicable at time of vehicle registration.
The Renault C3G 702 is a 1,239 cc inline‑four petrol engine engineered for compact city cars (1985-1996). It combines a simple SOHC valvetrain with a carburetted fuel system to deliver dependable, low-cost motoring. Designed for the emissions regulations of its era, it prioritises mechanical robustness over high performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,239 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 71.0 mm × 78.0 mm | |
Power output | 44 kW (60 PS) | |
Torque | 93 Nm @ 3,500 rpm | |
Fuel system | Single-barrel carburettor | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven camshaft | |
Oil type | Mineral 15W‑40 (API SF/CC) | |
Dry weight | 95 kg |
The Renault C3G 702 was used across Renault's Super 5 and early Clio I platforms with transverse mounting. This engine received minor platform-specific adaptations-different engine mounts and ancillary layouts between the Super 5 and Clio I. All adaptations are documented in OEM technical bulletins.
The C3G 702's primary reliability risk is timing belt failure due to age or missed service intervals. Neglecting this can result in complete engine destruction. Secondary issues often stem from the aging carburettor system, leading to drivability problems. Adherence to the maintenance schedule is paramount for longevity.
Analysis derived from Renault technical bulletins (1985-1996) and owner club maintenance logs. Repair procedures should follow manufacturer guidelines.
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The C3G 702 is fundamentally reliable if meticulously maintained. Its simple design is robust, but critical components like the timing belt and carburettor require strict adherence to service schedules. Neglect, particularly of the timing belt, leads to catastrophic failure. Well-cared-for examples can easily exceed 200,000 km.
The most critical issue is timing belt failure. Other frequent problems include carburettor wear causing running issues, oil leaks from aged gaskets, and ignition system component failure (distributor cap, leads, coil). These are well-documented in Renault service manuals.
The C3G 702 was primarily used in the Renault 5 (Super 5) from 1985 to 1990 and the first-generation Renault Clio (Clio I) from 1990 to 1996. It was fitted to base and mid-level trims like the Super 5 GTL and Clio RN/RL.
Minor tuning is possible. Options include fitting a performance carburettor, free-flow exhaust, and performance air filter, potentially gaining 5-10 PS. Significant power increases are difficult and costly due to the engine's basic design. Focus is usually on improving reliability and drivability.
Fuel economy is modest by modern standards. Expect around 7.5–8.5 L/100km (33–38 mpg UK) in mixed driving for a well-tuned engine in a Renault 5 or Clio I. City driving will be higher, around 9-10 L/100km, while highway cruising can achieve 6.5 L/100km.
Yes. The C3G 702 is definitively an interference engine. If the timing belt breaks or jumps teeth, the pistons will collide with the open valves, causing severe internal damage that requires a major engine rebuild or replacement.
Renault originally specified a mineral 15W-40 engine oil meeting API SF/CC standards. While modern 10W-40 semi-synthetics can be used, a quality mineral oil is often recommended for very old engines to prevent potential seal leaks from detergents in newer oils.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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.
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