The Alfa Romeo 552 84 636 – Diesel is a 1,910 cc, inline — four turbo — diesel engine produced between 2006 and 2010. It was developed as part of the Fiat Group's multi — brand diesel initiative, featuring common — rail direct injection (Multijet), variable geometry turbocharging (VGT), and DOHC valvetrain. In standard tune it delivered 120 kW (163 PS) and 380 Nm of torque, providing strong mid — range performance ideal for European driving conditions.
Fitted to models includ…
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5528). No Euro 5 variant of this engine was certified for UK market.
The Alfa Romeo 552 84 636 – Diesel is a 1,910 cc inline-four turbo-diesel engineered for premium mid-size models (2006–2010). It combines second-generation Multijet common-rail injection with a variable-geometry turbocharger to deliver responsive torque delivery and smooth refinement. Designed to meet Euro 4 emissions standards, it balances sporty character with real-world fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,910 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 83.0 mm × 88.3 mm | |
Power output | 120 kW (163 PS) @ 3,750 rpm | |
Torque | 380 Nm @ 1,750–2,750 rpm | |
Fuel system | Fiat-Multijet II 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 | Timing belt (service interval: 120,000 km) | |
Oil type | Fiat 9.55535-S2 M1 5W-40 | |
Dry weight | 148 kg |
The Alfa Romeo 552 84 636 – Diesel was used across Alfa Romeo's 939 platform with transverse mounting and shared architecture with Fiat and Lancia. This engine received platform-specific tuning-for enhanced throttle mapping in the Brera and revised exhaust routing in the Spider-and from 2008 received updated fuel calibration to improve cold-start behavior, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The 552 84 636 – Diesel's primary reliability risk is high-pressure fuel pump wear in early builds, with elevated incidence in regions with variable fuel quality. Internal Fiat Group quality reports from 2009 indicated a significant share of pre-2008 engines required pump replacement before 150,000 km, while UK DVSA records show increased EGR-related faults in urban-driven examples. Short-trip driving and poor diesel quality exacerbate fuel and emissions system stress, making service adherence and fuel sourcing critical.
Analysis derived from Alfa Romeo technical bulletins (2006-2010) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 552 84 636 – Diesel offers strong performance and efficiency, but early models (2006-2007) had reliability concerns, particularly high-pressure fuel pump wear. Later revisions (post-2008) improved pump durability. When maintained properly—with timely timing belt changes and quality diesel—it can exceed 250,000 km. Use of EN 590 diesel and adherence to service intervals are critical for longevity.
The most documented issues are high-pressure fuel pump wear, timing belt failure due to overdue service, EGR and intake carbon buildup, and glow plug failures in cold climates. These are covered in Fiat Group and Alfa Romeo service bulletins. Fuel quality significantly impacts reliability, especially in non-European markets.
This 2.0L JTDm engine was used in the Alfa Romeo 159 (2006-2010), Brera (2006-2010), and Spider (939, 2006-2010). It was also shared with the Lancia Delta (844) from 2008-2010. All models were Euro 4 compliant. No Giulietta or MiTo applications exist for this specific engine variant.
Yes. The engine responds well to ECU remapping, with stage 1 tunes typically adding +25–35 kW safely. The stock turbo and internals handle increased torque, but supporting mods (intercooler, exhaust) are recommended for higher stages. Tuning must preserve EGR/DPF functionality to avoid reliability issues. Always use a reputable tuner familiar with Multijet systems.
Very competitive for its era. In a 159 2.0 JTDm, combined consumption is approximately 5.8 L/100 km (~49 mpg UK). Highway driving can achieve 4.8 L/100 km (~59 mpg UK), while city use may reach 7.0 L/100 km (~40 mpg UK). Real-world economy depends on driving style, but 45–55 mpg UK is typical for mixed use.
Yes. The engine has an interference design, meaning if the timing belt fails, the pistons can strike the open valves, causing catastrophic damage. This makes adherence to the 120,000 km belt replacement interval absolutely critical. Any signs of belt wear or tensioner noise should prompt immediate service.
Alfa Romeo specifies Fiat 9.55535-S2 M1 5W-40 synthetic oil. This formulation is critical for turbocharger and injector protection. Oil changes should be performed every 15,000 km or annually. Using incorrect oil can accelerate turbo and fuel system wear, especially in high-load conditions.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
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