The Renault C1C 706 is a 956 cc, inline‑three petrol engine produced between 1983 and 1989. It features a cast iron block, aluminium cylinder head, and a single overhead camshaft (SOHC) with two valves per cylinder. This naturally aspirated unit was engineered for compact city cars, prioritizing light weight and fuel efficiency over outright power.
Fitted primarily to the Renault 5 (B/C22) Super 5 and occasionally the Renault Express van, the C1C 706 was designed for econ…
Production years 1983–1989 predate standardized Euro emissions regulations for passenger cars in the EU.
The Renault C1C 706 is a 956 cc inline‑three petrol engine engineered for supermini applications (1983-1989). It combines a simple SOHC, 6-valve design with a lightweight architecture to deliver adequate city performance and strong fuel economy. Designed for the pre-Euro emissions era, it prioritizes mechanical simplicity and cost-effective ownership.
| Parameter | Value | Source |
|---|---|---|
Displacement | 956 cc | |
Fuel type | Petrol | |
Configuration | Inline‑3, SOHC, 6‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 70.0 mm × 83.0 mm | |
Power output | 33–35 kW (45–47 PS) | |
Torque | 70–72 Nm @ 3,500 rpm | |
Fuel system | Carburetor (Solex) | |
Emissions standard | Pre-Euro | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven camshaft | |
Oil type | SAE 15W-40 (Mineral) | |
Dry weight | 85 kg |
The Renault C1C 706 was used across Renault's B/C22 platforms with transverse mounting. This engine received platform-specific adaptations-primarily different engine mounts and accessory brackets for the Renault 5 and Express variants. All adaptations are documented in OEM technical bulletins.
The C1C 706's primary reliability risk is timing belt failure due to neglected service intervals. Renault workshop data indicates this was a frequent cause of total engine loss in high-mileage examples. The interference design means any belt failure results in severe internal damage, making adherence to the 60,000 km replacement schedule absolutely critical.
Analysis derived from Renault technical bulletins (1983-1989) and historical workshop data. Repair procedures should follow manufacturer guidelines.
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The C1C 706 is a fundamentally simple and robust engine. Its long-term reliability is entirely dependent on strict adherence to the 60,000 km timing belt replacement schedule. Neglecting this will result in catastrophic engine failure. With proper maintenance, it can be very reliable.
The most critical issue is timing belt failure due to missed service intervals. Other common problems include carburetor faults, cooling system leaks from ageing hoses, and ignition system wear. These are well-documented in Renault's service literature for the B22 platform.
The C1C 706 was primarily used in the Renault 5 (Super 5, B/C22 chassis) from 1983 to 1989, across various trim levels (GTL, TSE). It was also fitted to the Renault Express van from 1986 to 1989.
Minor power gains are possible through carburetor and exhaust upgrades. However, the SOHC, 6-valve design and small displacement are significant limits. Major power increases are not practical or cost-effective on this engine.
Fuel economy is excellent for its era. Expect around 6.5 L/100km (43 mpg UK) in combined driving for a Renault 5 GTL. Real-world figures vary with driving style and vehicle condition, but it is known for its frugality.
Yes. The C1C 706 is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe internal damage and requiring a major engine rebuild or replacement.
Renault originally specified a SAE 15W-40 mineral oil. A modern 10W-40 semi-synthetic or mineral oil is also perfectly suitable for this low-stress engine and may offer slightly better cold-start protection.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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