The Alfa Romeo 955 A7.000 – Petrol is a 2,959 cc, V6, naturally aspirated engine produced between 1993 and 1998. It was developed as a refined powerplant for Alfa Romeo's executive saloon platforms, featuring a 24-valve DOHC configuration, sequential multi-point fuel injection, and twin-spark ignition. In standard tune it delivered 132 kW (180 PS) and 255 Nm of torque, with balanced firing intervals contributing to smooth power delivery and reduced vibration.
Fitted primarily to the Alfa Romeo 164 3.0 and 166 3.0, the 955 A7.000 – Petrol was engineered for long-distance comfort and dynamic driving. Its character emphasizes linear power delivery and strong mid-range response, making it well-suited for both motorway cruising and spirited motoring. Emissions compliance was achieved via catalytic converter and closed-loop lambda control, meeting Euro 2 standards across its production run.
One documented service concern involves early camshaft belt wear, highlighted in Alfa Romeo Service Information Bulletin 93/02. This issue stems from tensioner degradation and coolant intrusion in high-temperature areas. From 1994, revised belt materials and tensioner assemblies were introduced to improve durability.
All models comply with Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/7890).
The Alfa Romeo 955 A7.000 – Petrol is a 2,959 cc V6, naturally aspirated engine engineered for executive saloons (1993–1998). It combines 24-valve DOHC architecture with twin-spark ignition and sequential fuel injection to deliver smooth, refined performance. Designed to meet Euro 2 emissions standards, it balances driving engagement with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,959 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24-valve, twin-spark | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 88.0 mm × 81.0 mm | |
| Power output | 132 kW (180 PS) @ 5,800 rpm | |
| Torque | 255 Nm @ 4,200 rpm | |
| Fuel system | Siemens P3.1 sequential multi-point injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Dual cam belts with hydraulic tensioners | |
| Oil type | SAE 10W-40, API SL/CF | |
| Dry weight | 178 kg |
The V6 layout provides smooth power delivery and refined operation but demands adherence to 60,000 km cam belt replacement intervals to prevent interference damage. SAE 10W-40 oil meeting API SL/CF standards is recommended to ensure valve train lubrication and thermal stability. Coolant leaks near the timing covers should be addressed promptly to avoid belt degradation. The Siemens P3.1 system requires periodic airflow meter and injector servicing to maintain drivability. Post-1994 models benefit from upgraded belt materials and tensioner design per Alfa Romeo SIB 93/02; pre-1994 units should be retrofitted for improved reliability. Lambda sensor maintenance is essential for consistent emissions compliance.
Oil Specs: Requires SAE 10W-40 API SL/CF specification (Alfa Romeo SIB 93/02). Compatible with ACEA A2/B2 standards.
Emissions: Euro 2 certification applies to all production years (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under ISO 1585. Output may vary slightly based on fuel octane (RON 95 minimum).
Alfa Romeo Technical Information System (TIS): Docs A77810, A77440, SIB 93/02
VCA Type Approval Database (VCA/EMS/7890)
ISO 1585: Road vehicles — Methods of measurement of fuel consumption
The Alfa Romeo 955 A7.000 – Petrol was used across Alfa Romeo's 164/166 platforms with longitudinal mounting and shared architecture with Lancia models in select European markets. This engine received platform-specific adaptations-revised intake manifolds in the 166 and modified exhaust routing in the 164-and from 1994 the updated 164 Series 2 models adopted improved emissions controls, 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 starter motor (Alfa Romeo TIS A77850). The 8th VIN digit indicates engine type ('L' for 3.0 V6 units). Pre-1994 models feature silver valve covers with black rubber gaskets; post-1994 units use black valve covers. Critical differentiation from 2.0 variants: The 955 A7.000 – Petrol has a 60° V6 layout with dual cam belts and twin-spark ignition. Service parts require production date verification—cam belts for pre-1994 models are incompatible with later tensioner designs (Alfa Romeo SIB 93/02).
The 955 A7.000 – Petrol's primary reliability risk is cam belt failure on early builds, with elevated incidence in high-temperature or neglected maintenance conditions. Internal Alfa Romeo service data from 1995 reported a significant number of pre-1994 engines suffering belt-related damage before 80,000 km, while VCA field reports link timing failures to delayed servicing. Extended intervals and coolant leaks increase belt slippage and degradation, making timely replacement and tensioner inspection critical.
Analysis derived from Alfa Romeo technical bulletins (1993–1998) and UK DVSA failure statistics (1994–1999). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO 955A7000.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
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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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