The Lancia 175 A4.000 is a 1,995 cc, inline‑four petrol engine produced between 1984 and 1994. It features a twin‑cam (DOHC) design and electronic fuel injection, delivering refined power delivery and improved emissions control for its era. The aluminium alloy block and head construction maintained a favorable power-to-weight ratio for agile handling.
Fitted to models such as the Lancia Thema and Y10, the 175 A4.000 was engineered for smooth, quiet operation and comfortable highway cruising. Emissions compliance for its production period was achieved through precise electronic fuel injection and catalytic converter integration, aligning with evolving Euro 1 standards in later production years.
One documented engineering update addressed premature wear of the camshaft drive belt tensioner pulley bearings, which could lead to belt slippage or failure. This was rectified in Lancia service documentation, recommending specific upgraded tensioner pulleys for vehicles undergoing timing belt service.
Production years 1984–1992 meet national regulations; 1993–1994 models comply with Euro 1 standards (Italian Ministry of Transport Type Approval).
The Lancia 175 A4.000 is a 1,995 cc inline‑four petrol engine engineered for executive sedans and premium hatchbacks (1984-1994). It combines dual overhead camshafts with electronic fuel injection to deliver smooth, linear power and low emissions. Designed to meet Euro 1 standards in its final years, it balances refinement with respectable performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.0 mm × 82.0 mm | |
| Power output | 95 kW (129 PS) @ 5,800 rpm | |
| Torque | 170 Nm @ 4,000 rpm | |
| Fuel system | Electronic fuel injection (Bosch L-Jetronic) | |
| Emissions standard | National Regulations (pre-1993); Euro 1 (1993-1994) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled, pressurised | |
| Turbocharger | None | |
| Timing system | Belt-driven DOHC | |
| Oil type | SAE 10W-40 (Mineral) | |
| Dry weight | Not available in OEM documentation |
The DOHC design provides smooth, refined power ideal for comfortable cruising but demands strict adherence to the 60,000 km timing belt replacement interval to prevent catastrophic engine failure. SAE 10W-40 mineral oil is specified for its balance of protection and flow. The Bosch L-Jetronic system is generally reliable but requires clean electrical grounds and a healthy battery for optimal operation. The documented tensioner pulley wear issue necessitates using the upgraded OEM pulley during belt service.
Oil Specs: Requires SAE 10W-40 mineral oil specification (Lancia Owner's Manual, Thema 1985). Modern synthetic equivalents meeting API SF/CC or earlier are often used.
Emissions: Euro 1 certification applies to 1993-1994 models only (Italian Ministry of Transport Type Approval). Pre-1993 models comply with national regulations.
Power Ratings: Measured under period-typical standards (e.g., DIN 70020). Figures are net power as installed in vehicle (Lancia Type Approval Documentation 1984).
Lancia Workshop Manual, Chassis 834 (1984)
Lancia Parts Catalogue, Vol. 5 (1985)
Lancia Owner's Manual, Thema (1985)
Italian Ministry of Transport, Type Approval Records
The Lancia 175 A4.000 was used across Lancia's Thema and Y10 platforms with longitudinal and transverse mounting respectively. This engine received platform-specific adaptations for ancillary drive layouts and engine management harness routing. From 1993, emissions equipment was updated for Euro 1 compliance, creating minor parts differences. All adaptations are documented in OEM technical bulletins.
Locate the engine type code stamped on a flat boss on the cylinder block, typically near the oil filter or on the front face adjacent to the water pump (Lancia Workshop Manual 834). The code "175 A4.000" should be clearly visible. Visually, it is identifiable by its twin camshaft covers and the Bosch electronic fuel injection components (air flow meter, ECU, injectors). Differentiation from the carburetted engines is by the presence of the fuel injection system. Service parts for the timing belt system require verification of the tensioner pulley type (original or upgraded) as per Lancia Technical Bulletin.
The 175 A4.000's primary reliability risk is timing belt failure due to tensioner pulley wear, with catastrophic consequences if neglected. Lancia service data indicates this was a prevalent issue in high-mileage examples that missed scheduled belt changes. Adherence to the 60,000 km replacement interval with the upgraded tensioner is critical to prevent total engine loss.
Analysis derived from Lancia technical bulletins (1984-1994) and aggregated data from Lancia owner club technical advisors. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA 175-A4-000.
Comprehensive technical documentation and regulatory references
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LANCIA 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
Type-approval guidance and documentation.
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