The Renault K4M 740 is a 1,598 cc, inline‑four petrol engine produced between 2000 and 2008. It features a dual overhead camshaft (DOHC) design with 16 valves and multi‑point fuel injection. This naturally aspirated unit delivered 79 kW (107 PS) and 148 Nm of torque, offering a balance of responsiveness and everyday drivability for its vehicle class.
Fitted to popular models like the Mégane II, Scénic II, and Laguna II, the K4M 740 was engineered for reliable, economical ur…
Production years 2000–2008 meet Euro 3 standards .
The Renault K4M 740 is a 1,598 cc inline‑four petrol engine engineered for compact and mid‑size models (2000-2008). It combines DOHC 16-valve architecture with multi-point fuel injection to deliver smooth, linear power delivery. Designed to meet Euro 3 standards, it prioritizes reliability and cost-effective ownership.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 79.5 mm × 80.5 mm | |
Power output | 79 kW (107 PS) @ 5,750 rpm | |
Torque | 148 Nm @ 3,750 rpm | |
Fuel system | Multi-point fuel injection (Bosch Motronic) | |
Emissions standard | Euro 3 | |
Compression ratio | 9.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Renault RN0700 (SAE 5W‑40) | |
Dry weight | 112 kg |
The Renault K4M 740 was used across Renault's Mégane II and Scénic II platforms with transverse mounting. This engine received platform-specific adaptations-minor ECU mapping differences for the Laguna II-creating no significant interchange limits. All adaptations are documented in OEM technical bulletins.
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The K4M 740's primary documented concern is exhaust camshaft lobe wear, with higher incidence in vehicles subjected to frequent short trips. Renault internal data indicated a measurable rate of camshaft replacement for affected early-build engines, while general owner feedback highlights ignition coil failures as a common electrical fault. Inadequate oil changes can accelerate cam wear, making adherence to the specified interval critical.
Analysis derived from Renault technical bulletins (2003-2007) and aggregated owner-reported failure data (2010-2023). 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 K4M 740 is generally robust, but early models (2000-2003) have a known issue with exhaust camshaft wear. Later units and well-maintained examples are quite dependable. Regular oil changes with the correct specification (5W-40 RN0700) are crucial for preventing cam wear and ensuring longevity.
The most documented issues are premature exhaust camshaft lobe wear (early models), ignition coil failures, coolant leaks from the plastic thermostat housing, and oil seepage from the rocker cover gasket. These are covered in Renault service bulletins and common repair guides.
The K4M 740 1.6L 16V petrol engine was primarily used in the first phase of the Mégane II (2002-2006) and Scénic II (2003-2006). It was also fitted to the first phase Laguna II (2001-2005) in some markets. It is not used in Nissan or Dacia models.
Yes, modest gains are possible. An ECU remap can typically yield an extra 8-12 kW by optimizing ignition and fuel maps. Bolt-on modifications like a performance air filter and exhaust can add a few more kW. Significant power increases are limited by the naturally aspirated design and stock internals.
Fuel economy is reasonable for its era. Expect around 8.5 L/100km in city driving and 5.8 L/100km on the highway in a Mégane II, translating to approximately 33 mpg UK combined. Actual figures vary significantly based on driving style, vehicle condition, and model weight.
Yes. The K4M engine family is an interference design. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing severe internal engine damage requiring a major rebuild.
Renault specifies oil meeting the RN0700 standard, typically a 5W-40 synthetic or semi-synthetic grade. Using the correct oil is vital for protecting the camshafts. The service interval is generally 15,000 km or 12 months, whichever comes first.
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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