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 and reliability in urban environments. Emissions compliance for its production period was managed through a carburetted fuel system and basic exhaust gas management, meeting the applicable standards of the time.
One documented concern is wear in the timing belt tensioner pulley bearing, which can lead to belt slippage or failure if not inspected. This issue, referenced in Renault's internal service documentation, is often linked to age and extended service intervals. The engine's design remained largely unchanged throughout its production run.
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 carburetted system offers simple repairs but requires periodic tuning for optimal running and fuel economy. Using the specified 15W-40 mineral oil is critical to protect older bearing materials and seals. The timing belt must be replaced strictly per schedule (typically every 60,000 km or 5 years) to prevent catastrophic interference engine damage. The lack of modern emissions controls means it may not comply with current low-emission zones. Its simple design makes it a popular choice for restorations.
Oil Specs: Requires Mineral 15W-40 (API SF/CC) specification (Renault Service Manual 3G). Modern synthetics may cause seal leaks.
Emissions: Pre-dates Euro standards. Compliance was based on national regulations at time of manufacture (EU Historical Regs).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across model years (Renault Homologation Dossier).
Renault Service Manual: Engine 3G
Renault EPC (Electronic Parts Catalogue) Ref. 77 11 000 000
Renault Technical Bulletin: TB-3G-01
EU Historical Vehicle Emissions Regulations Archive
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.
Locate the engine code stamped on a flat boss on the front face of the cylinder block, near the gearbox flange. The full code for this variant is 'C3G 702'. Visually, it is identified by its single-barrel carburettor and lack of fuel injection components. Critical differentiation from later E-type engines: C3G uses a timing belt, while E-type engines often use chains. Service parts like the timing belt kit are specific to the C3G series and not interchangeable with other Renault 1.2L engines.
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.
Find answers to most commonly asked questions about RENAULT C3G-702.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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