The Renault K4J 740 is a 1,390 cc, inline‑four naturally aspirated petrol engine produced between 2001 and 2006. It features a DOHC, 16‑valve design with multi — point fuel injection, delivering a balance of efficiency and responsiveness for compact vehicles. Its twin overhead camshafts enable precise valve control, contributing to smoother operation and better fuel economy for everyday urban and highway driving.
Fitted primarily to the Clio II (B/C57) and Twingo II (…
Production years 2001–2006 meet Euro 3 emissions standards (EU Directive 98/69/EC).
The Renault K4J 740 is a 1,390 cc inline‑four naturally aspirated petrol engine engineered for supermini and city cars (2001-2006). It combines multi-point fuel injection with a DOHC 16-valve valvetrain to deliver responsive performance and good fuel efficiency. Designed to meet Euro 3 emissions standards, it offers a practical balance of cost, reliability, and drivability for its vehicle class.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,390 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 79.5 mm × 70.0 mm | |
Power output | 66 kW (90 PS) | |
Torque | 122 Nm @ 4,250 rpm | |
Fuel system | Multi-point fuel injection (Siemens) | |
Emissions standard | Euro 3 | |
Compression ratio | 9.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven (requires periodic replacement) | |
Oil type | Semi-synthetic 5W‑40 (ACEA A3/B3) | |
Dry weight | Not specified in available OEM docs |
The Renault K4J 740 was used across Renault's Clio II and Twingo II platforms with transverse mounting. This engine received minimal platform-specific adaptations beyond ancillary bracketry. All adaptations are documented in OEM technical bulletins.
The K4J 740's primary reliability risk is timing belt tensioner pulley failure, with elevated incidence in high-mileage or poorly maintained engines. While fundamentally robust, Renault service data indicated this as a common point of failure if maintenance intervals are exceeded. Ensuring timely belt and tensioner replacement is critical to prevent roadside breakdowns.
Analysis derived from Renault technical bulletins (2001-2006) and internal service documentation. Repair procedures should follow manufacturer guidelines.
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The K4J 740 is generally a reliable and robust engine when maintained properly. Its main vulnerability is the timing belt system; adhering strictly to the 60,000 km replacement interval for the belt and tensioner is paramount. With this key maintenance performed, the engine is capable of high mileage without major issues.
The most frequent issues are failure of the timing belt tensioner pulley, ignition coil packs causing misfires, and coolant leaks from the plastic thermostat housing. A common but harmless issue is a rattling exhaust heat shield. These are well-documented in Renault service bulletins and owner experiences.
The K4J 740 engine was used in the 1.4 16V variants of the second-generation Renault Clio (B/C57, 2001-2006) and the second-generation Renault Twingo (C06, 2001-2006). It was not used in later model generations or other Renault vehicle lines.
Minor power gains are possible through ECU remapping or installing a less restrictive intake/exhaust, typically yielding 5-10 additional PS. Significant power increases are not practical due to the engine's naturally aspirated design and modest internal components. It's best suited to its stock, economical configuration.
Fuel economy is very good for a petrol engine of its era. Expect real-world figures around 6.5-7.5 L/100km (38-43 mpg UK) on mixed driving. In city conditions, consumption might be 8.0-9.0 L/100km (31-35 mpg UK), while steady highway cruising can achieve 5.5-6.0 L/100km (47-51 mpg UK).
No. The Renault K4J 740 is a non-interference (free-wheeling) engine. If the timing belt were to fail, the pistons and valves would not collide, preventing catastrophic internal damage. This is a significant safety feature, though a broken belt will still leave you stranded.
It requires a good quality semi-synthetic 5W-40 engine oil meeting ACEA A3/B3 specifications. Using the correct oil is essential for the longevity of the hydraulic lifters and overall engine health. Renault recommends changing the oil every 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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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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