The Renault C3G 712 is a 1,239 cc, inline‑four petrol engine produced between 1985 and 1996. It features a single overhead camshaft (SOHC) and a 2‑barrel carburettor, delivering modest power outputs suitable for its era. This engine was designed for cost‑effective manufacturing and reliable urban mobility, making it a common sight in Renault's smaller vehicles.
Fitted primarily to the Renault 9 and 11 (Alliance/Encore in North America), the C3G 712 was engineered for economical, fuss‑free transportation. Its simple design prioritised ease of maintenance and fuel efficiency over high performance, aligning with the needs of everyday drivers in the late 1980s and early 1990s. Emissions compliance for its production period was managed through basic engine tuning and exhaust systems, meeting the standards applicable at the time of manufacture.
One documented service consideration is the potential for carburettor wear and fuel vaporisation issues in hot climates, which could lead to starting difficulties or rough idling. This is addressed in Renault's technical service documentation, which recommends specific maintenance procedures and, in some cases, the installation of an auxiliary fuel pump or revised carburettor components for affected vehicles.
Production years 1985–1996 meet the emissions standards applicable in their respective markets at the time of manufacture (EU Directive 83/351/EEC).
The Renault C3G 712 is a 1,239 cc inline‑four petrol engine engineered for compact sedans and hatchbacks (1985-1996). It combines a simple SOHC valvetrain with a 2‑barrel carburettor to deliver adequate power for city driving and light highway use. Designed for its era, it prioritises mechanical simplicity and fuel economy over high performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,239 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 75.0 mm × 70.0 mm | |
| Power output | 55–59 kW (75–80 PS) | |
| Torque | 95–100 Nm @ 3,500 rpm | |
| Fuel system | 2‑barrel carburettor (Solex or Weber) | |
| Emissions standard | Pre‑Euro standards (Market specific) | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven camshaft | |
| Oil type | Mineral 15W‑40 or 10W‑40 | |
| Dry weight | Not specified in available OEM documentation |
The naturally aspirated SOHC design offers predictable, if unexciting, performance ideal for commuting but requires diligent carburettor maintenance to prevent running issues. Using a quality mineral oil (15W-40) and adhering to shorter service intervals (every 10,000 km) helps maintain engine longevity, particularly for the timing chain. Vehicles in hot climates may benefit from the auxiliary fuel pump upgrade per Renault Bulletin 91A to mitigate vaporisation. The simple 8-valve head is robust but not designed for high-RPM operation.
Oil Specs: Requires mineral oil (15W-40 or 10W-40) specification (Renault Service Manual 9/11). Synthetic oils were not recommended for this era.
Emissions: Pre-Euro standards certification applies to all models (EU Directive 83/351/EEC). No formal Euro classification exists for this engine.
Power Ratings: Measured under DIN 70020 standards. Output varies slightly by model year and carburettor type (Renault Group PT-1990).
Renault Technical Information System: Specification Sheet C3G
Renault Service Manual: Renault 9 & 11 (Alliance/Encore)
Renault Service Bulletin: 91A (Fuel System)
EU Directive 83/351/EEC on vehicle emissions
The Renault C3G 712 was used across Renault's R9/R11 platforms with transverse mounting and was also used in American Motors Corporation (AMC) vehicles for the North American market. This engine received minor regional adaptations-for example, different carburettor jetting for US emissions-and specific model year updates to the ignition system. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the engine block, near the gearbox flange (Renault TIS C3G). The full code will read "C3G 712" or "C3G 716" for different power outputs. Visually, it is identified by its cast-iron block, aluminium SOHC cylinder head, and a prominent 2-barrel carburettor (Solex 32 DIS or Weber 28/32 TLDM). Critical differentiation from the later Energy engine (C3J): The C3G has a timing chain cover that is integral to the cylinder head, whereas the C3J uses a separate cover. Service parts for carburettor and ignition systems are specific to model year and market.
The C3G 712's primary reliability consideration is carburettor maintenance, with elevated incidence of issues in hot climates or with infrequent use. Renault service data indicates that a significant portion of drivability complaints for this engine relate to the fuel system, while basic mechanical components like the timing chain are generally robust with proper oil changes. Extended periods of inactivity or use of low-quality fuel make regular inspection and cleaning critical.
Analysis derived from Renault technical bulletins (1985-1996) and owner workshop manuals. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT C3G-712.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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