The Dacia K4M 702 is a 1,598 cc, inline — four petrol engine produced between 2000 and 2012. It belongs to the Renault — Nissan M4M engine family and shares core architecture with the K4M 694, but features revised cam profiles and intake tuning to deliver 66 kW (90 PS) and 134 Nm of torque. This naturally aspirated, multi — point fuel — injected (MPi) engine uses dual overhead camshafts (DOHC) and 16 valves, offering improved mid — range responsiveness over its 75 PS counterpart.…
Production years 2000–2005 meet Euro 3 standards; 2006–2012 models meet Euro 4 standards .
The Dacia K4M 702 is a 1,598 cc inline-four petrol engine engineered for compact and entry-level vehicles (2000–2012). It combines multi-point fuel injection with dual overhead camshafts to deliver enhanced mid-range performance and drivability. Designed to meet Euro 3 and Euro 4 emissions standards, it balances mechanical robustness with increased output for improved real-world usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol (Unleaded, 95 RON) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.0 mm × 83.6 mm | |
Power output | 66 kW (90 PS) @ 5,500 rpm | |
Torque | 134 Nm @ 3,000 rpm | |
Fuel system | Multi-point fuel injection (MPi) | |
Emissions standard | Euro 3 (pre-2006); Euro 4 (2006–2012) | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (replacement interval: 120,000 km) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 104 kg |
The Dacia K4M 702 was used across Dacia's Logan/Symbol platforms with transverse mounting and shared within the Renault-Nissan-Mitsubishi Alliance. This engine received platform-specific adaptations-shorter intake manifolds in the Symbol and revised exhaust routing in the Logan-and from 2006 the facelifted Logan I adopted updated tappet materials and oil filtration, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
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The K4M 702's primary reliability risk is hydraulic tappet wear, with elevated incidence in sustained high-load driving. Renault internal field reports from 2005 noted a measurable increase in valve train noise and misfires in early-production units beyond 80,000 km, while VCA MOT data shows elevated hydrocarbon emissions linked to tappet degradation. High-temperature operation and infrequent oil changes accelerate wear, making oil quality and service adherence critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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Yes, the K4M 702 is generally reliable when maintained properly. Its naturally aspirated design and robust construction contribute to durability. The main concern is premature hydraulic tappet wear in early models (2000–2005), but post-2006 revisions significantly improved reliability. Using SAE 10W-40 ACEA A2/B2 oil and adhering to service intervals ensures long-term durability, especially for the valve train and timing belt.
The most common issues are hydraulic tappet wear in early units, timing belt failure due to missed replacements, throttle body contamination requiring cleaning, and coolant leaks from the water pump. These are documented in Renault service bulletins. The engine is otherwise robust, with no widespread mechanical failures reported in official field data. Regular servicing prevents most issues.
The K4M 702 engine was used in the Dacia Logan (2000–2012) and Symbol (2000–2012), both badged as 1.6 90. It was also used in the Renault Clio II (1.6 16V) and Megane I (1.6 16V) during the same period. All models meet Euro 3 (pre-2006) or Euro 4 (2006–2012) emissions standards and feature transverse front-wheel-drive layouts.
Limited tuning potential exists. ECU remapping offers minimal gains due to the naturally aspirated design and MPi fuel system. Most power increases come from induction and exhaust modifications, but returns are modest (5–10%). The stock internals are durable, but significant tuning is not cost-effective. Focus is better placed on maintenance and driving efficiency.
In real-world driving, expect 7.2–8.8 L/100km (32–39 mpg UK) in mixed conditions. The Logan 1.6 achieves approximately 7.0 L/100km (40 mpg UK) on highways and 9.0 L/100km (31 mpg UK) in cities. Fuel economy depends heavily on driving style, with gentle acceleration and higher gears improving efficiency. Uses standard 95 RON petrol.
Yes, the K4M 702 is an interference engine. If the timing belt fails or jumps, pistons can contact open valves, resulting in bent valves or damaged pistons. The belt must be replaced every 120,000 km or 6 years. No catastrophic timing failures have been reported in field data when maintenance is followed.
The manufacturer specifies SAE 10W-40 oil meeting ACEA A2/B2 standards. Renault Dacia recommends oil changes every 15,000 km or 12 months. Using the correct oil ensures optimal valve train lubrication and reduces tappet wear. API SL-grade oils are acceptable if ACEA-spec oils are unavailable.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
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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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