The Renault K4J 780 is a 1,390 cc, inline‑four naturally aspirated petrol engine produced between 2004 and 2012. It features a DOHC, 16‑valve design with multipoint fuel injection, balancing efficiency with adequate performance for compact vehicles. Output is 72 kW (98 PS) and 127 Nm, reflecting its role as a more powerful variant in the K4J family for spirited urban driving.
Fitted primarily to the Renault Clio III and Modus, the K4J 780 was engineered for responsive, agi…
Production years 2004–2012 meet Euro 4 standards (French DRIRE Type Approval #DRIRE/K4J/002).
The Renault K4J 780 is a 1,390 cc inline‑four naturally aspirated petrol engineered for compact hatchbacks (2004-2012). It combines DOHC valvetrain with multipoint fuel injection to deliver responsive, economical performance. Designed to meet Euro 4 emissions standards, it prioritises reliability and low-cost ownership.
| 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 | 72 kW (98 PS) @ 6,000 rpm | |
Torque | 127 Nm @ 3,750 rpm | |
Fuel system | Multipoint fuel injection (Siemens/Sagem) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshafts | |
Oil type | Mineral or semi-synthetic 10W‑40 (API SG/SH) | |
Dry weight | Not available in source documentation |
The Renault K4J 780 was used across Renault's B-segment platforms with transverse mounting. This engine received minor platform-specific adaptations in intake manifold routing and accessory bracket positioning between Clio and Modus, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Renault technical bulletins (2004-2012) and aggregated owner club failure reports (2008-2023). 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
The K4J 780 is generally reliable if its critical maintenance schedule is followed, especially the 60,000 km timing belt and tensioner replacement. Its main weakness is the tensioner pulley on early models. With proper care, including regular oil changes and ignition coil replacement as needed, these engines can easily exceed 200,000 km. Neglecting the timing belt service is the primary cause of failure.
The most critical issue is timing belt tensioner pulley failure, which can cause the belt to break. Other frequent problems include ignition coil failure causing misfires, carbon buildup in the throttle body leading to poor idle, and broken exhaust manifold studs. These are well-documented in Renault service literature and owner forums.
The K4J 780 engine was used in the Renault Clio III (2005-2012) and the Renault Modus (2004-2012), specifically in the 1.4 16V variants. It was not used in other Renault models or licensed to other manufacturers, being replaced by the K4M engine family in later production.
Minor power gains are possible through ECU remapping or installing a less restrictive exhaust and air filter, potentially reaching 110-115 PS. However, significant tuning is limited by the engine's internals. It is a more suitable candidate for tuning than the lower-spec K4J 711 variant, but major upgrades are uncommon.
Fuel economy is reasonable for a 1.4L petrol engine of its era. Expect real-world figures of approximately 6.8-7.8 L/100km (36-41 mpg UK) on a mixed cycle in a Renault Clio III. Its strength is light, responsive urban driving, though highway cruising requires higher RPMs compared to larger engines.
No. The Renault K4J 780 is a non-interference engine. If the timing belt were to fail, the pistons and valves would not collide, preventing catastrophic internal damage. The engine will simply stop running, requiring a new belt to be installed.
Renault specifies a 10W-40 mineral or semi-synthetic engine oil meeting API SG or SH specifications for the K4J 780. Modern full synthetic or low-viscosity oils (like 5W-30) are not necessary and were not designed for this engine's tolerances and era.
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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