The Renault K4M 743 is a 1,598 cc, inline‑four petrol engine produced between 2000 and 2010. It features a dual overhead camshaft (DOHC) design with 16 valves and multi‑point fuel injection, delivering outputs ranging from 79 kW (107 PS) to 81 kW (110 PS) and torque figures of 148–151 Nm. Its double overhead camshaft layout enables precise valve control for responsive everyday drivability.
Fitted to models such as the Mégane II, Scénic II, and Laguna II, the K4M 743 was engineered for a balance of refinement, adequate power, and fuel efficiency in compact and mid‑size vehicles. Emissions compliance was achieved through electronic throttle control and a three‑way catalytic converter, allowing conformity with Euro 3 standards for its production period.
One documented concern is premature wear of the exhaust camshaft lobes, potentially leading to reduced performance and misfires. This issue, referenced in Renault Technical Note MEG‑02‑2006, is often attributed to insufficient lubrication under specific operating conditions. Later K4M variants incorporated revised camshaft metallurgy and oiling improvements.
Production years 2000–2010 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault K4M 743 is a 1,598 cc inline‑four petrol engine engineered for compact and mid‑size hatchbacks and estates (2000-2010). It combines multi‑point fuel injection with DOHC 16‑valve architecture to deliver smooth, linear power delivery and efficient urban commuting. Designed to meet Euro 3 standards, it balances everyday usability with moderate fuel consumption.
| 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 | 79–81 kW (107–110 PS) | |
| Torque | 148–151 Nm @ 3,750 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 | Chain‑driven (upper camshafts) | |
| Oil type | Renault RN0700 (SAE 5W‑40) | |
| Dry weight | 112 kg |
The DOHC 16-valve design provides smooth power delivery but requires strict adherence to 15,000 km oil change intervals using Renault RN0700 (5W-40) to prevent camshaft lobe wear. Extended oil life or incorrect viscosity can accelerate wear on the exhaust camshaft, as noted in Technical Note MEG-02-2006. The timing chain is generally robust but tensioner inspection is recommended during major services. The engine is tolerant of standard 95 RON fuel. Pre-2005 units should be monitored for camshaft wear symptoms.
Oil Specs: Requires Renault RN0700 (5W-40) specification (Renault Service Manual 1311A). ACEA A3/B4 compliant.
Emissions: Euro 3 certification applies to all 2000-2010 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ISO 1585 standards. Output consistent across model range (Renault Group PT-2005).
Renault Technical Information System: Docs 1311A, MEG-02-2006
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code — Net power
The Renault K4M 743 was used across Renault's Mégane II/Scénic II platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Laguna II-and from 2005 minor ECU revisions for emissions, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox flange (Renault Service Manual 1311A). The 8th VIN digit often corresponds to engine type ('F' for K4M 743 in many applications). Visually, it features a black plastic cam cover with "16v" branding. Critical differentiation from later K4M 748: K4M 743 uses a Siemens fuel injection ECU with a specific connector type under the bonnet. Engine management parts require verification against the specific engine serial number prefix.
The K4M 743's primary reliability risk is exhaust camshaft lobe wear, with elevated incidence in high-mileage or poorly maintained units. Renault internal data noted this as a service concern for pre-2005 builds, while general owner reports frequently cite ignition coil failures. Extended oil change intervals and use of incorrect oil viscosity make adherence to RN0700 specification critical.
Analysis derived from Renault technical bulletins (2004-2008) and owner-reported failure patterns. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT K4M-743.
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Regulation (EC) No 715/2007
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