The Renault C1J 792 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 C1J 792 was engineered for a balance of urban economy and spirited driving. Its robust, low‑revving character made it ideal for varied driving conditions. Emissions compliance for its era was managed through a carburettor or basic single‑point fuel injection, meeting applicable national standards prior to the widespread adoption of Euro norms.
A known area for attention is the timing belt, which requires strict adherence to the 60,000 km or 4‑year replacement interval. Failure to replace it can lead to catastrophic engine damage, as noted in Renault Service Bulletin 7711A3. The water pump is often driven by the timing belt, making its replacement a recommended concurrent procedure.
Production years 1985–1996 predate standardized EU Euro emissions regulations. Compliance was based on national standards applicable at time of manufacture (VCA UK Type Approval for relevant import models).
The Renault C1J 792 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 | 10W-40 mineral or semi-synthetic | |
| Dry weight | 102 kg |
The engine's simple SOHC design offers predictable, low-cost motoring but demands strict 60,000 km timing belt changes to prevent total engine failure. Using 10W-40 oil is standard, with more frequent changes advised for high-mileage or urban use. The carburetted variants are sensitive to fuel quality and require periodic tuning. The water pump, driven by the timing belt, should always be replaced during belt service per Renault SIB 7711A3 to avoid subsequent failure and labor costs.
Oil Specs: Requires 10W-40 mineral or semi-synthetic specification (Renault Technical Manual 7711A). ACEA A3/B3 specification is suitable.
Emissions: Pre-Euro certification based on national standards applicable at manufacture (VCA Type Approval for UK models). No standardized EU emissions applied.
Power Ratings: Measured under EEC 80/1269 standards. Output varies by model year and fuel system (Renault Group PT-1990).
Renault Technical Information System: Manual 7711A, SIB 7711A3
Renault EPC (Electronic Parts Catalogue) Ref. 77 11 008 000
EEC Directive 80/1269/EEC - Engine Power Measurement
The Renault C1J 792 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.
Locate the engine code stamped on the front face of the cylinder block, just below the thermostat housing (Renault Tech Manual 7711A). The code will read "C1J 792" followed by a serial number. Visually, it is a compact, cast-iron block engine with a single camshaft cover on the cylinder head. Early carburetted models have a prominent carburettor atop the intake manifold, while later SPI models feature a throttle body and fuel rail. Critical differentiation from the smaller C1G: C1J has a 1.4L displacement (75.8mm bore) vs. C1G's 1.1L (70mm bore).
The C1J 792'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.
Find answers to most commonly asked questions about RENAULT C1J-792.
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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.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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