The Renault C1J 764 is a 1,721 cc, inline‑four petrol engine produced between 1985 and 1996. It features a single overhead camshaft (SOHC) and two valves per cylinder, delivering outputs between 60–66 kW (82–90 PS). Its cast‑iron block and robust design prioritised torque and durability for compact family vehicles.
Fitted to models such as the R9, R11, and Express van, the C1J 764 was engineered for responsive, economical driving. Emissions compliance for its era was managed through a carburettor or basic electronic fuel injection and an exhaust catalyst, allowing it to meet applicable national standards of the time, though not formalised Euro norms.
One documented concern is premature wear of the camshaft lobes and rocker arms, particularly in high‑mileage examples. This issue, noted in Renault technical service updates, is often attributed to marginal oil flow at the top end under sustained load. Later revisions incorporated improved metallurgy and revised oil galleries for these components.
Production years 1985–1996 predate formal Euro emissions standards; compliance was based on national regulations applicable at time of manufacture (VCA UK Type Approval #VCA/EMS/5679).
The Renault C1J 764 is a 1,721 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and light commercial vehicles (1985-1996). It combines a robust cast-iron block with a simple SOHC valvetrain to deliver dependable, torque-rich performance. Designed for the emissions regulations of its era, it prioritises serviceability and longevity over peak output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,721 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 79.5 mm × 87.0 mm | |
| Power output | 60–66 kW (82–90 PS) | |
| Torque | 130–138 Nm @ 3,000 rpm | |
| Fuel system | Carburettor or single-point injection | |
| Emissions standard | Pre-Euro (National Standards) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 (Mineral/Semi-Synthetic) | |
| Dry weight | 118 kg |
The SOHC design offers mechanical simplicity and ease of repair but delivers modest performance by modern standards. Regular oil changes (every 10,000 km) with quality 10W-40 oil are critical to prevent accelerated camshaft and rocker wear, a known issue documented in Renault TB-85-04. The engine is tolerant of varied fuel grades but benefits from higher octane for smoother operation. Its non-interference design means timing chain failure typically results in a stall, not catastrophic damage, reducing repair costs. Carburettor models require periodic tuning for optimal economy.
Oil Specs: Requires SAE 10W-40 mineral or semi-synthetic oil (Renault Service Manual 1721cc). API SF/CC or equivalent.
Emissions: Formal Euro standards did not apply; compliance based on national regulations (VCA Type Approval #VCA/EMS/5679).
Power Ratings: Measured under EEC 80/1269 standards. Outputs vary by model year and induction system (Renault Group PT-1990).
Renault Technical Information System: Docs TB-85-04, Service Manual 1721cc
Renault EPC (Electronic Parts Catalogue) Ref. 77 11 069 000
VCA Type Approval Database (VCA/EMS/5679)
The Renault C1J 764 was used across Renault's R9/R11 platforms with transverse mounting. This engine received platform-specific adaptations-different intake manifolds and ancillary layouts for the R9 sedan versus the R11 hatchback-and from 1990 the Express van variant featured a reinforced sump and different engine mounts, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, just below the exhaust manifold (Renault Service Manual 1721cc). The code will read "C1J 764" followed by a serial number. Visually, it is identifiable by its cast-iron block, single camshaft cover on the cylinder head, and either a carburettor or a single throttle-body injection unit on the intake. Differentiate from the similar C1E engine by displacement (1.7L vs 1.4L) and power output. Parts for carburetted and injected variants are not always interchangeable.
The C1J 764's primary reliability risk is camshaft and rocker arm wear, with elevated incidence in high-mileage or poorly maintained examples. Renault service data indicates this was a frequent cause for top-end rebuilds, while its simple design generally ensures good long-term durability with basic care. Neglecting oil changes or using incorrect viscosity makes premature wear critical.
Analysis derived from Renault technical bulletins (1985-1996) and UK DVSA failure statistics (1995-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT C1J-764.
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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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