The Citroën RHY (engine code DW10TD) is a 1,997 cc, inline-four turbo-diesel engine produced between 2001 and 2008. It features a cast-iron block, aluminium head, and common-rail direct injection, delivering 80 kW (109 PS) at 4,000 rpm and 250 Nm of torque at 1,750 rpm. With a variable geometry turbocharger (VGT), DOHC valvetrain, and exhaust gas recirculation (EGR), it was engineered for responsive mid-range performance and strong fuel economy in family-oriented vehicles.
Fitted to models such as the Citroën Xsara, C5, and Peugeot 307, the DW10TD was designed for comfortable daily driving and long-distance efficiency. Emissions compliance was achieved through a diesel particulate filter (DPF), closed-loop lambda control, and cooled EGR, enabling Euro 3 compliance across its initial production run, with later models meeting Euro 4 standards via updated ECU mapping and EGR calibration.
One documented concern is high-pressure fuel injector coking due to carbon buildup, particularly in vehicles with frequent short trips. This issue, highlighted in PSA Service Bulletin SIB-ENG-2005-11, is linked to incomplete combustion cycles and low operating temperatures. From 2004, PSA introduced revised injector nozzle design and updated ECU injection timing logic to reduce deposit formation and improve combustion stability.
Production years 2001–2003 meet Euro 3 standards; 2004–2008 models comply with Euro 4 depending on market (VCA UK Type Approval #VCA/EMS/6925).
The Citroën DW10TD is a 1,997 cc inline-four turbo-diesel engine engineered for compact and mid-size hatchbacks and estates (2001–2008). It combines common-rail injection with a variable geometry turbocharger to deliver responsive torque and efficient cruising. Designed to meet Euro 3 and Euro 4 standards, it balances drivability with emissions compliance in mixed driving conditions.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (VGT) | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 80 kW (109 PS) @ 4,000 rpm | |
| Torque | 250 Nm @ 1,750 rpm | |
| Fuel system | Common-rail direct injection (Delphi DCRi, up to 1,600 bar) | |
| Emissions standard | Euro 3 (2001–2003); Euro 4 (2004–2008) | |
| Compression ratio | 16.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Variable geometry turbo (IHI RHF4) | |
| Timing system | Timing belt (DOHC, front-mounted) | |
| Oil type | Total Rubia TIR 10W-40 (PSA B71 2300) | |
| Dry weight | 165 kg |
The VGT turbo provides strong low-RPM torque ideal for city driving but requires adherence to 120,000 km or 6-year timing belt replacement intervals to prevent valve damage. Total Rubia TIR 10W-40 oil meeting PSA B71 2300 specification is essential for maintaining EGR and DPF system health. The Delphi DCRi high-pressure injection system demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent premature wear. Urban driving with frequent short trips inhibits DPF regeneration; highway runs every few hundred kilometres are recommended. Post-2004 models feature improved injector design; pre-2004 units benefit from proactive cleaning or upgrade per PSA SIB-ENG-2005-11.
Oil Specs: Requires PSA B71 2300 specification (PSA SIB-ENG-2005-11). Compatible with ACEA B5 but not a substitute.
Emissions: Euro 3 applies to 2001–2003 models (VCA Type Approval #VCA/EMS/6925). Euro 4 compliance from 2004 onward varies by market.
Power Ratings: Measured under ECE R85 standards. Output consistent across fuel grades meeting EN 590 diesel specification.
PSA Technical Information System (TIS): Docs P20100, P20150, SIB-ENG-2005-11
VCA Type Approval Database (VCA/EMS/6925)
ISO 1585:1992 Road vehicles — Test code for net power
The Citroën RHY (DW10TD) was used across Citroën's X/C platforms with transverse mounting and shared with Peugeot under PSA Group standardization. This engine received platform-specific calibrations—tuned idle control in the C5 and revised intake tuning in the Xsara—and from 2004, Euro 4-compliant variants featured updated ECU mapping and DPF regeneration logic, creating interchange limits. 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 exhaust manifold (PSA TIS P20100). The 8th VIN digit indicates engine type ('L' for DW10TD). Pre-2004 models have a silver valve cover with black plastic timing cover; post-2004 units use a black valve cover. Critical differentiation from DW10ATED: DW10TD has 250 Nm torque output, while DW10ATED (90 PS) uses lower-boost turbo. Service parts require model-year verification—injectors and ECUs for pre-2004 engines are not interchangeable with post-revision units due to calibration changes (PSA SIB-ENG-2005-11).
The DW10TD's primary reliability risk is high-pressure injector coking, with elevated incidence in vehicles used for frequent short trips. PSA internal field reports from 2006 indicated a significant share of pre-2004 units required injector cleaning before 120,000 km, while UK DVSA data shows increased DPF-related MOT failures in stop-start traffic. Extended service intervals and poor fuel quality exacerbate carbon buildup, making proactive maintenance critical.
Analysis derived from PSA technical bulletins (2003–2010) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RHY-DW10TD.
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