The Citroen CRD93LS (U25/673) is a 2,499 cc, inline — four naturally aspirated diesel engine produced between 1985 and 1992. It features indirect injection via a pre — combustion chamber, SOHC valvetrain, and mechanical fuel injection pump. In standard tune it delivered 55 kW (75 PS), providing robust low — end torque ideal for heavy — duty commercial and estate applications.
Fitted to models such as the Citroen BX 4x4, C25 Van, and XM, the CRD93LS was engineered for durabil…
Production years 1985–1992 meet pre-Euro standards; no Euro 1 conversion was implemented for this engine .
The Citroen CRD93LS (U25/673) is a 2,499 cc inline-four naturally aspirated diesel engineered for full-size vans and 4x4 models (1985–1992). It combines indirect injection with a mechanically governed fuel pump to deliver consistent low-RPM performance. Designed for load-carrying and off-road use, it prioritises mechanical robustness and longevity over emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,499 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 94.6 mm × 88.0 mm | |
Power output | 55 kW (75 PS) @ 4,200 rpm | |
Torque | 150 Nm @ 2,000 rpm | |
Fuel system | Bosch M-CEI mechanical indirect injection (pre-chamber) | |
Emissions standard | Pre-Euro (non-compliant with Euro 1) | |
Compression ratio | 22.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not fitted | |
Timing system | Timing belt (interval: 60,000 km) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 185 kg |
The Citroen CRD93LS (U25/673) was used across Citroen's BX/C25 platforms with longitudinal mounting and shared with Peugeot under PSA platform agreements. This engine received platform-specific adaptations-reinforced mounts in the C25 Van and revised exhaust routing in the BX 4x4-and from 1988 the updated XM adopted revised cooling system tuning, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The CRD93LS (U25/673) is known for mechanical simplicity and durability when maintained properly. Pre-1988 models have a documented risk of cylinder head warping, but later revisions improved gasket and cooling system integrity. With regular timing belt changes, coolant maintenance, and quality oil, these engines can exceed 300,000 km in commercial service.
The most common issues are cylinder head warping, injection pump wear, timing belt failure if not replaced on schedule, and oil sludge buildup from poor maintenance. These are documented in PSA service bulletins DT-M-092 and DT-M-085.
The CRD93LS (U25/673) engine was used in the Citroen BX 4x4 (1985–1990), C25 Van (1989–1992), and XM (1989–1992) as the 2.5 D. It was also shared with Peugeot J5 under PSA platform agreements. All models are front-wheel or four-wheel drive with longitudinal engine mounting.
Limited tuning potential exists. Mechanical injection systems restrict significant gains. Some owners upgrade to turbo manifolds and injectors for mild improvements, but true performance tuning requires full conversion to electronic injection. Stock reliability should not be compromised without expert calibration.
In real-world driving, expect 7.0–8.5 L/100km (40–33 mpg UK) in mixed conditions. The BX 2.5 D 4x4 achieves approximately 6.8 L/100km (41 mpg UK) on highways. Fuel quality (cetane 48+) and driving style significantly impact consumption.
Yes. The CRD93LS (U25/673) is an interference engine. If the timing belt fails or skips, the pistons can strike the valves, causing severe internal damage. Adhering to the 60,000 km replacement interval is essential to prevent catastrophic failure.
PSA specifies SAE 15W-40 oil meeting API CD standards. This viscosity ensures proper lubrication for the mechanical injection pump and valvetrain. Change oil every 15,000 km or annually to maintain engine health and reduce sludge formation.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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