The Fiat 834 B.000 is a 1,995 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1994. It features a single overhead camshaft (SOHC), two valves per cylinder, and a carbureted fuel system. This simple, robust unit was designed for dependable service in Fiat's passenger car range, delivering 77 kW (105 PS) and 162 Nm of torque for adequate everyday performance.
Fitted to models like the Regata, Croma, and Ducato van, the 834 B.000 was engineered for cost-effective ownership and ease of maintenance. Emissions compliance for its era was managed through basic engine calibration and an early catalytic converter system, meeting Euro 0 and later Euro 1 standards depending on model year and market.
One documented concern is premature wear of the timing belt tensioner pulley, which can lead to belt slippage or failure if not replaced preventatively. This issue, referenced in Fiat Service Bulletin 89/07, is often linked to the use of non-OEM tensioners or extended replacement intervals beyond the recommended 60,000 km.
Production years 1985–1992 meet Euro 0 standards; 1993–1994 models meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/834).
The Fiat 834 B.000 is a 1,995 cc inline‑four naturally aspirated petrol engine engineered for passenger cars and light commercial vehicles (1985-1994). It combines a simple SOHC valvetrain with carburetion to deliver reliable, low-cost operation. Designed to meet Euro 0 and Euro 1 standards, it prioritizes mechanical simplicity and ease of repair.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 77 kW (105 PS) @ 5,500 rpm | |
| Torque | 162 Nm @ 3,000 rpm | |
| Fuel system | Carburetor (Weber or Solex) | |
| Emissions standard | Euro 0 (1985-1992); Euro 1 (1993-1994) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | API SF/CC (SAE 10W‑40) | |
| Dry weight | 145 kg |
The carbureted fuel system provides mechanical simplicity and easy diagnosis but requires periodic adjustment and is less efficient than fuel injection. Strict adherence to the 60,000 km timing belt and tensioner replacement interval is critical to prevent catastrophic engine damage from belt failure. Using only OEM-specified tensioners is advised per Fiat SIB 89/07. Regular valve clearance checks (every 30,000 km) are necessary to maintain performance and fuel economy. Pre-1993 models lack a catalytic converter and have different emissions equipment.
Oil Specs: Requires API SF/CC specification oil (Fiat Workshop Manual 834). 10W-40 viscosity recommended for most climates.
Emissions: Euro 0 applies to 1985-1992 models; Euro 1 applies to 1993-1994 models (VCA Type Approval #VCA/EMS/834).
Power Ratings: Measured under EEC 80/1268 standards. Output is consistent across model years (Fiat Group PT-1990).
Fiat Technical Workshop Manual: Engine 834
Fiat Service Information Bulletin (SIB): 89/07
VCA Type Approval Database (VCA/EMS/834)
The Fiat 834 B.000 was used across Fiat's passenger and light commercial platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Ducato-and from 1993 the addition of a catalytic converter for Euro 1 compliance, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the engine block, near the timing belt cover (Fiat Workshop Manual 834). The code "834 B.000" will be clearly visible. Visually, it can be identified by its cast-iron block, SOHC valve cover, and the presence of a carburetor (Weber 32/34 DFT or Solex C32 DIS) on the intake manifold. Differentiate from fuel-injected variants by the lack of fuel rails and injectors. Engines built after 1992 can be identified by the presence of a catalytic converter and associated lambda sensor wiring.
The 834 B.000's primary reliability risk is timing belt tensioner failure, with elevated incidence following extended service intervals or use of non-OEM parts. Fiat internal service data indicated this was a leading cause of major engine damage in neglected vehicles, while its simple mechanical design otherwise proved very durable. Proactive belt and tensioner replacement is critical.
Analysis derived from Fiat technical bulletins (1985-1994) and UK DVSA failure statistics (1990-2000). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 834-B-000.
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Regulation (EC) No 715/2007
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