The Renault K9K 629 is a 1,461 cc, inline‑four turbo‑diesel engine produced between 2001 and 2008. It features a single overhead camshaft (SOHC) design with 8 valves and common rail direct injection, delivering outputs ranging from 40 kW (54 PS) to 65 kW (88 PS) and torque figures of 160–200 Nm. Its compact dimensions and lightweight cast — iron block make it ideal for B — segment vehicles requiring strong low — rpm torque for urban drivability.
Fitted to models such as the Clio…
Production years 2001–2008 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5682).
The Renault K9K 629 is a 1,461 cc inline‑four turbo‑diesel engineered for compact city cars and vans (2001-2008). It combines common rail direct injection with SOHC 8‑valve architecture to deliver strong low-end torque and exceptional fuel economy. Designed to meet Euro 3 standards, it prioritises efficiency and compact packaging for urban mobility.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,461 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 76.0 mm × 80.5 mm | |
Power output | 40–65 kW (54–88 PS) | |
Torque | 160–200 Nm @ 1,900 rpm | |
Fuel system | Bosch CP1 common‑rail (up to 1,350 bar) | |
Emissions standard | Euro 3 | |
Compression ratio | 18.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed geometry turbo (Garrett) | |
Timing system | Belt‑driven (requires 100,000 km replacement) | |
Oil type | Renault RN0700 (SAE 5W‑40) | |
Dry weight | 110 kg |
The Renault K9K 629 was used across Renault's Clio II/Kangoo I platforms with transverse mounting. This engine received platform-specific adaptations-lighter flywheel in the Twingo-and from 2004 minor ECU revisions for emissions, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
The K9K 629's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel or neglecting filter changes. Renault internal data noted this as a significant service concern for pre-2005 builds, while general owner reports frequently cite EGR valve clogging. Adherence to fuel quality standards and 15,000 km service intervals is critical for longevity.
Analysis derived from Renault technical bulletins (2003-2007) and owner-reported failure patterns. 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 K9K 629 is generally reliable with proper maintenance. Its main weakness is the high-pressure fuel pump in early (pre-2005) models if poor-quality fuel is used. Later units and well-serviced examples can easily exceed 250,000 km. Using high-quality diesel and changing the fuel filter regularly is crucial for longevity.
The most frequent issues are high-pressure fuel pump failure (pre-2005), EGR valve clogging causing rough running, turbocharger actuator problems leading to boost loss, and glow plug/relay failures affecting cold starts. These are well-documented in Renault service information.
The K9K 629 was primarily used in the Renault Clio II (2001-2005), Kangoo I (2001-2007), Twingo (2004-2007), and Dacia Logan (2004-2008). It was typically badged as the '1.5 dCi' in these models.
Yes, modest gains are possible. ECU remaps can yield +10-20 kW by optimizing fuel and boost maps. More significant power requires a larger turbo and intercooler, though the engine's internals are robust for moderate increases. Reliability should be prioritized, and supporting modifications (clutch, brakes) are recommended.
Fuel economy is excellent. Expect around 5.0 L/100km in city driving and 3.8 L/100km on the highway, averaging 4.2-4.5 L/100km (63-67 mpg UK) combined for a Clio II. Consumption is among the best for its era, making it a very economical choice.
Yes. The K9K 629 is an interference engine. If the timing belt were to fail (though rare if serviced), the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the belt is very durable with proper maintenance.
Renault mandates RN0700 specification oil, typically SAE 5W-40. Using this specific oil is important for turbocharger and engine protection. Change intervals should not exceed 15,000 km or 12 months, whichever comes first, to ensure engine longevity.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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