The Alfa Romeo 552 68 818 is a 1,956 cc, inline — four turbo — diesel engine produced between 2006 and 2010. It features common — rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). Developed in collaboration with Fiat Powertrain Technologies, it delivered 100 kW (136 PS) and 320 Nm of torque, providing strong mid — range performance for compact executive vehicles.
Fitted to models such as the 159 2.0 JTDM, GT 2.0 JTDM, and Brera…
Production years 2006–2010 meet Euro 4 emissions standards .
The Alfa Romeo 552 68 818 is a 1,956 cc inline-four turbo-diesel engineered for compact executive models (2006–2010). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive mid-range torque and balanced efficiency. Designed to meet Euro 4 standards, it supports refined performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,956 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 83.0 mm × 90.4 mm | |
Power output | 100 kW (136 PS) @ 4,000 rpm | |
Torque | 320 Nm @ 1,750–2,750 rpm | |
Fuel system | Bosch CRS 2.0 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
Timing system | Chain-driven (single-row, front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 158 kg |
The Alfa Romeo 552 68 818 was used across Alfa Romeo's 939 platform with transverse mounting. This engine received platform-specific tuning for sportier throttle response in the Brera and GT, and from 2008 updated fuel calibration to improve HPFP durability, creating minor service part distinctions. 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 552 68 818 offers strong performance and efficiency, but pre-2008 models are prone to high-pressure fuel pump failures. Later revisions with updated pumps and filters show improved durability. Regular maintenance using correct oil (Fiat 9.55535-S2) and high-quality diesel (EN 590) is essential for longevity. Well-maintained units can reliably exceed 200,000 km.
Key issues include high-pressure fuel pump failure (especially pre-2008), EGR valve/coolant clogging, turbo actuator sticking, and coolant leaks from the thermostat housing. These are documented in Alfa Romeo technical bulletins and field service reports. Fuel quality and maintenance intervals significantly influence reliability.
This 2.0L JTDM diesel was used exclusively in the 159, GT, and Brera models from 2006 to 2010. All variants produce 136 PS and are Euro 4 compliant. The engine is transversely mounted and tuned for sportier response in the GT and Brera compared to the 159.
Aftermarket ECU tuning is common on the 55268818 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In combined driving, expect 5.8–6.5 L/100 km (43–49 mpg UK). Highway consumption can drop to ~5.0 L/100 km (57 mpg UK), while city driving may reach 7.0 L/100 km (40 mpg UK). Real-world economy depends on driving style and vehicle condition, with well-maintained examples achieving up to 55 mpg UK on motorways.
Yes. The 552 68 818 is an interference engine. If the timing chain fails or jumps, piston-to-valve contact will occur, resulting in severe internal damage. While chain failures are rare with proper maintenance, any unusual front-end noise should be investigated immediately to prevent catastrophic engine failure.
Alfa Romeo specifies Fiat 9.55535-S2 (5W-40) synthetic oil. This formulation ensures proper lubrication for the turbocharger and high-pressure fuel pump. Oil must be changed every 15,000 km or annually to maintain engine longevity and prevent premature wear in critical components.
Comprehensive technical documentation and regulatory references
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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
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VCA Certification Portal
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