The Dacia B4D 400 is a 1,461 cc, inline-four, naturally aspirated petrol engine produced between 2008 and 2018. It was developed by Renault for use across its value-oriented models, including the Dacia Logan, Sandero, and Dokker. Featuring a cast-iron block, aluminium head, and multi-point fuel injection (MPFI), it delivers 59 kW (80 PS) at 5,500 rpm and 120 Nm of torque at 3,000 rpm. Designed for simplicity and durability, it supports extended service intervals under regular driving conditions.
Fitted to high-volume models such as the Logan (L90), Sandero (J90), and Dokker (X90), the B4D 400 was engineered for cost-effective ownership, urban commuting, and light-duty use. Its driving character prioritises reliability over performance, making it ideal for emerging markets and fleet operations. Emissions compliance was achieved through a three-way catalytic converter and oxygen sensor feedback, enabling Euro 4 compliance from 2008 and Euro 5 from 2010, as verified under EU Regulation (EC) No 715/2007.
One documented concern is premature wear of the timing belt tensioner, particularly in hot climates or under extended service intervals. This issue, referenced in Renault Service Information Bulletin TDB/04/11, can lead to belt slippage or breakage if not addressed. In 2012, revised tensioner materials and updated inspection intervals were introduced across the B4D engine family to improve long-term reliability.
Production years 2008–2009 meet Euro 4 standards; 2010–2018 models comply with Euro 5 (VCA UK Type Approval #VCA/EMS/5678).
The Dacia B4D 400 is a 1,461 cc inline-four petrol engine engineered for compact and utility vehicles (2008–2018). It combines multi-point fuel injection with a robust cast-iron block to deliver dependable urban performance. Designed to meet Euro 5 emissions standards, it balances low running costs with proven mechanical durability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,461 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 76.8 mm | |
| Power output | 59 kW (80 PS) @ 5,500 rpm | |
| Torque | 120 Nm @ 3,000 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 4 (2008–2009); Euro 5 (2010–2018) | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (interval: 120,000 km or 6 years) | |
| Oil type | SAE 5W-30 (ACEA A1/B1 or A5/B5) | |
| Dry weight | 98 kg |
The naturally aspirated design provides predictable, linear throttle response ideal for city driving but lacks low-end torque, requiring higher revs for overtaking. Adherence to the 120,000 km or 6-year timing belt replacement interval is critical to prevent catastrophic engine damage. Use of SAE 5W-30 oil meeting ACEA A5/B5 specifications ensures adequate protection in high-temperature environments. The MPFI system is tolerant of lower-quality fuels but performs best with 95 RON or higher. Post-2012 models benefit from revised tensioner design; earlier units should be inspected per Renault SIB TDB/04/11. The catalytic converter requires regular full-load operation to prevent clogging in predominantly urban use.
Oil Specs: Requires SAE 5W-30 meeting ACEA A1/B1 or A5/B5 (Renault SIB OIL/03/15). Compatible with API SL/CF.
Emissions: Euro 5 certification applies to 2010 and later models (VCA Type Approval #VCA/EMS/5678). Earlier models meet Euro 4.
Power Ratings: Measured under ECE R85 standards. Output unchanged across fuel grades (Renault TIS Doc. M12401).
Renault Technical Information System (TIS): Docs M12401, M12403, SIB TDB/04/11
VCA Type Approval Database (VCA/EMS/5678)
European Commission Regulation (EC) No 715/2007
The Dacia B4D 400 was used across Dacia's L90/J90/X90 platforms with transverse mounting and shared with Renault for Logan-based commercial variants. This engine received platform-specific adaptations-shorter intake manifolds in the Sandero and reinforced engine mounts in the Dokker-and from 2012 the updated tensioner design improved timing belt reliability, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, below the exhaust manifold (Renault TIS M12401). The 8th VIN digit indicates engine type ('B' for B4D series). Pre-2012 models have a black plastic timing cover with silver tensioner housing; post-2012 units use an updated black composite tensioner. Critical differentiation from K4M: B4D 400 has a single-row timing belt and 8-valve head, while K4M uses a 16-valve DOHC layout. Service parts require production date verification—timing kits for engines before 06/2012 are incompatible with later units due to tensioner redesign (Renault SIB TDB/04/11).
The B4D 400's primary reliability risk is timing belt failure on early builds, with elevated incidence in hot climates and extended service cycles. Renault internal reports from 2013 indicated a significant share of pre-2012 engines required belt replacement before 100,000 km, while VCA data links timing-related failures to neglected maintenance in fleet-operated vehicles. High ambient temperatures and infrequent full-load operation increase belt and tensioner stress, making adherence to replacement intervals critical.
Analysis derived from Renault technical bulletins (2010-2016) and UK DVSA failure statistics (2014-2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DACIA B4D400.
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