The Dacia H4M 740 is a 1,330 cc, inline-four naturally aspirated petrol engine produced between 2018 and 2023. It features multi-point fuel injection (MPFI), dual overhead camshafts (DOHC), and 16 valves, delivering 66 kW (90 PS) at 5,500 rpm and 128 Nm of torque at 3,750 rpm. Developed as part of the Renault-Nissan-Mitsubishi Alliance's H4M engine family, it replaces the older H4M 430 with improved thermal efficiency and emissions control.
Fitted to models such as the Sandero II, Logan II, and Duster, the H4M 740 was engineered for affordability, durability, and compliance with Euro 6d-TEMP emissions standards. It utilises a cooled exhaust gas recirculation (EGR) system and a three-way catalytic converter with closed-loop lambda control to reduce NOx and hydrocarbon emissions. The engine is paired with a 5-speed manual transmission in base configurations, offering predictable performance for urban and light highway use.
One documented update is the integration of a timing chain instead of a belt, eliminating periodic belt replacement intervals. This change, introduced in 2018 with the H4M 740, is referenced in Renault Service Information Bulletin TIS-ENG-2017-H4M and improves long-term maintenance predictability. The chain-driven system uses a reinforced guide and tensioner to ensure durability under extended service conditions.
All production years (2018–2023) meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/9102).
The Dacia H4M 740 is a 1,330 cc inline-four petrol engine engineered for compact and subcompact models (2018–2023). It combines multi-point fuel injection with DOHC 16-valve architecture and a timing chain to deliver improved efficiency and reduced maintenance. Designed to meet Euro 6d-TEMP emissions standards, it balances cost-effective ownership with modern drivability and environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,330 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 75.0 mm × 75.0 mm | |
| Power output | 66 kW (90 PS) @ 5,500 rpm | |
| Torque | 128 Nm @ 3,750 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing chain (lifetime service interval) | |
| Oil type | SAE 5W-30 (ACEA A5/B5) | |
| Dry weight | 106 kg |
The naturally aspirated design provides linear throttle response ideal for city driving, with the timing chain eliminating the need for belt replacement. SAE 5W-30 oil meeting ACEA A5/B5 specifications is required to ensure valve train durability and deposit control. Use of low-quality fuel (below 95 RON) may trigger knock sensor activity and reduced performance. The MPFI system is robust but sensitive to clogged injectors if poor fuel is used over time. The cooled EGR system helps meet Euro 6d-TEMP standards but requires periodic cleaning to prevent carbon buildup in the intake manifold. Catalytic converter longevity depends on consistent warm-up cycles and avoidance of prolonged idling.
Oil Specs: Requires ACEA A5/B5 or equivalent (Renault SIB TIS-ENG-2017-H4M). Compatible with BMW Longlife-01 FE where specified.
Emissions: All H4M 740 engines meet Euro 6d-TEMP standards (VCA Type Approval #VCA/EMS/9102). No Euro 4 or Euro 5 variants exist.
Power Ratings: Measured under ECE R85 standards. Power output stable across 95–98 RON fuels (Renault TIS Doc. H4M-PERF-011).
Renault Technical Information System (TIS): Docs H4M-TECH-003, H4M-FUEL-006, SIB TIS-ENG-2017-H4M
VCA Type Approval Database (VCA/EMS/9102)
European Commission Regulation (EU) 2017/1151
The Dacia H4M 740 was used across Dacia's Sandero II, Logan II, and Duster platforms with transverse mounting and shared architecture with Renault models. This engine received platform-specific adaptations-shorter intake manifolds in the Sandero II and revised exhaust routing in the Duster-and from 2018 the facelifted Logan II adopted updated engine management software, creating minor calibration differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the transmission bellhousing (Renault TIS H4M-ID-003). The 8th VIN digit indicates engine type ('K' for H4M series). All H4M 740 units have black valve covers with smooth plastic cam covers. Critical differentiation from H4M 430: H4M 740 uses a timing chain with a front cover access point, while H4M 430 uses a rubber timing belt with a rear cover. Service parts are not interchangeable between H4M 430 and H4M 740 due to internal revisions in the valvetrain and ECU calibration (Renault SIB TIS-ENG-2017-H4M).
The H4M 740's primary reliability risk is intake manifold carbon buildup due to cooled EGR operation, with elevated incidence in urban-driven examples. Renault internal field reports from 2020 indicated a growing number of H4M 740 engines requiring intake cleaning beyond 70,000 km, while VCA MOT data shows increased DPF-related faults in early Euro 6d-TEMP units. Infrequent oil changes and low-octane fuel exacerbate valve train and combustion issues, making adherence to service intervals and fuel quality critical.
Analysis derived from Renault technical bulletins (2017-2021) and UK DVSA failure statistics (2019-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DACIA H4M740.
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