The Renault C2J 798 is a 1,397 cc, inline‑four petrol engine produced between 1985 and 1996. It features a single overhead camshaft (SOHC) and two valves per cylinder, prioritizing simplicity and cost‑effective manufacturing. Output ranged from 55 kW (75 PS) to 66 kW (90 PS), with torque figures around 105–112 Nm, providing a noticeable step up in performance from the smaller C1G.
Fitted primarily to the Renault 5 (Super 5 GTL, GT Turbo) and early Clio I models, the C2J 798 wa…
Production years 1985–1996 predate standardized EU Euro emissions regulations. Compliance was based on national standards applicable at time of manufacture relevant import models).
The Renault C2J 798 is a 1,397 cc inline‑four naturally aspirated petrol engine engineered for supermini and hot hatch applications (1985-1996). It combines a simple SOHC valvetrain with carburetion or basic fuel injection to deliver predictable, economical performance with more power than its 1.1L sibling. Designed for pre-Euro regulatory environments, it prioritizes mechanical reliability and ease of service.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,397 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.8 mm × 77.0 mm | |
Power output | 55–66 kW (75–90 PS) | |
Torque | 105–112 Nm @ 3,500 rpm | |
Fuel system | Carburettor or Single-point injection | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven (interference design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 102 kg |
The Renault C2J 798 was used across Renault's Super 5 platform with transverse mounting. This engine received minor adaptations between the Phase 1 and Phase 2 Super 5, primarily involving the fuel system (carburettor to SPI) and ancillaries. All adaptations are documented in OEM technical bulletins.
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The C2J 798's primary reliability risk is timing belt failure due to neglected service intervals. Renault service data indicates a high correlation between engine seizures and missed 60,000 km belt changes. The concurrent failure of the belt-driven water pump is also common, making combined replacement a critical preventative measure.
Analysis derived from Renault technical bulletins (1985-1996) and owner club maintenance records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the C2J 798 is renowned for its mechanical simplicity and durability, provided the timing belt is changed religiously every 60,000 km or 4 years. Neglecting this service is the primary cause of catastrophic failure. With proper maintenance, these engines can easily exceed 200,000 km.
The absolute most critical issue is timing belt failure leading to engine destruction. Other common problems include carburettor faults on early models, water pump leaks, ignition system wear (distributor, HT leads), and minor oil leaks from the valve cover gasket.
The C2J 798 was primarily used in the Renault 5 (Super 5), across both Phase 1 (1985-1987) and Phase 2 (1987-1990) models, including the performance-oriented GT Turbo. It was also fitted to the very early first-generation Renault Clio (1990-1992) before being replaced by newer engine families.
Modest gains are possible. Common upgrades include a performance exhaust, high-flow air filter, and carburettor re-jetting or upgrade. For SPI models, an ECU remap is not feasible; mechanical upgrades are the limit. The GT Turbo variant already represents the factory's tuned version of this engine.
Fuel economy is reasonable for its era and size. Expect around 7.0-8.0 L/100km (35-40 mpg UK) on a combined cycle for a well-maintained car. Carburetted models may be slightly thirstier than SPI variants. Real-world figures depend heavily on driving style and vehicle condition.
Yes. This is critically important. The C2J 798 is an interference engine. If the timing belt breaks or slips, the pistons will collide with the open valves, causing severe and expensive internal engine damage. Strict adherence to the timing belt replacement schedule is non-negotiable.
Renault recommends a 10W-40 mineral or semi-synthetic oil for the C2J 798. An oil meeting ACEA A3/B3 specifications is suitable. Change intervals should be every 10,000 km or 12 months for optimal engine longevity, especially under urban driving conditions.
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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