The Renault K9K 628 is a 1,461 cc, inline‑four turbo‑diesel engine produced between 2007 and 2011. It features a double overhead camshaft (DOHC) design with 8 valves and common rail direct injection. This compact unit delivered 63 kW (86 PS) and 200 Nm of torque, offering strong low — end pull ideal for urban driving and light towing.
Fitted to models such as the Clio III, Modus, and Twingo, the K9K 628 was engineered for drivers seeking fuel efficiency and responsive torque in…
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/9012).
The Renault K9K 628 is a 1,461 cc inline‑four turbo‑diesel engineered for compact city vehicles (2007-2011). It combines common-rail direct injection with a single fixed-geometry turbocharger to deliver strong low-rpm torque and efficient operation. Designed to meet Euro 4 standards, it balances urban drivability with fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,461 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 76.0 mm × 80.5 mm | |
Power output | 63 kW (86 PS) @ 4,000 rpm | |
Torque | 200 Nm @ 1,900 rpm | |
Fuel system | Siemens common-rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 15.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed-geometry turbo (Garrett) | |
Timing system | Chain‑driven (front‑mounted) | |
Oil type | Renault RN0710 (SAE 5W‑40) | |
Dry weight | 110 kg |
The Renault K9K 628 was used across Renault's Clio III and Modus platforms with transverse mounting. This engine received platform-specific adaptations-minor ECU calibrations for different body weights-and no significant facelift revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
The K9K 628's primary documented reliability concern is high-pressure fuel pump failure, with elevated incidence in vehicles subjected to poor-quality diesel fuel or extended service intervals. Renault internal service data indicated a notable number of pump replacements under warranty for 2008-2009 model year vehicles, while adherence to the RN0710 oil specification and using EN 590 fuel proved effective in mitigating the issue. Neglecting fuel quality makes timely pump inspection critical.
Analysis derived from Renault technical bulletins (2007-2011) and UK DVSA failure statistics (2012-2023). 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 K9K 628 is generally a robust engine. Its main known issue is the high-pressure fuel pump, which Renault addressed with updated parts. With strict adherence to oil changes using RN0710 5W-40, using only high-quality EN 590 diesel, and addressing common ancillary issues like the EGR valve, these engines can easily surpass 200,000 km without major problems.
The most documented issue is high-pressure fuel pump failure, often linked to fuel quality. Other frequent problems include EGR valve clogging, DPF regeneration issues (especially with short trips), and glow plug/module failure. These are covered in Renault service documentation and are generally straightforward to repair.
The K9K 628 was used in the Renault Clio III (2007-2011), Modus (2007-2010), and Twingo (2007-2011), all badged as the '1.5 dCi 86'. It was a popular engine for Renault's compact and city car lineup during this period, offering a good balance of performance and economy.
Yes, the K9K is quite tunable. ECU remaps are common and can safely increase power to around 100-110 PS and torque to 220-240 Nm. The stock internals are generally robust enough to handle this level of tuning. More significant power gains require upgraded turbochargers and injectors, which is more complex and costly.
Fuel economy is excellent. Expect around 5.0-5.5 L/100km (51-56 mpg UK) in mixed urban driving and 4.0-4.5 L/100km (63-71 mpg UK) on the highway in a Clio III. Its small displacement and diesel efficiency make it very economical, especially on longer journeys.
Yes. The K9K 628 is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing severe internal engine damage. Fortunately, the chain is very durable with proper maintenance.
Renault mandates oil meeting the RN0710 specification, typically a 5W-40 synthetic designed for diesel engines with DPFs. Using this specific oil is crucial for protecting the engine and ensuring the DPF functions correctly. Change intervals should not exceed 20,000 km or 12 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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