The Fiat 939 B5.000 is a 1,995 cc, inline‑four petrol engine produced between 1996 and 1998. It features a twin‑cam (DOHC) design with four valves per cylinder and multi‑point fuel injection. This naturally aspirated unit delivered approximately 103 kW (140 PS) and 180 Nm of torque, providing spirited performance for its class.
Fitted primarily to the Fiat Coupé and Fiat Marea models, the 939 B5.000 was engineered for responsive, sporty driving with an emphasis on mid-range power delivery. Emissions compliance for its production period was managed through its electronic fuel injection system and catalytic converter, meeting prevailing EU standards.
One documented service consideration involves the hydraulic timing belt tensioner, which can develop internal leaks leading to belt slippage or failure. This is noted in Fiat service documentation, where extended intervals or incorrect tensioner installation can precipitate premature wear. Replacement with the updated tensioner design is recommended during belt service.
Production years 1996–1998 meet applicable EU emissions standards for that period (VCA UK Type Approval documentation).
The Fiat 939 B5.000 is a 1,995 cc inline‑four petrol engine engineered for sporty compact models (1996-1998). It combines multi‑point fuel injection with a dual overhead camshaft to deliver responsive power and a broad torque curve. Designed to meet the emissions regulations of its time, it prioritizes driver engagement and performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 103 kW (140 PS) @ 6,200 rpm | |
| Torque | 180 Nm @ 4,000 rpm | |
| Fuel system | Multi-point fuel injection (Magneti Marelli IAW) | |
| Emissions standard | EU Standards (Pre-Euro 2 / Early Euro 2) | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven camshafts (hydraulic tensioner) | |
| Oil type | SAE 10W-40 (ACEA A3/B3) | |
| Dry weight | 135 kg |
The DOHC 16-valve design offers strong performance but requires strict adherence to the 60,000 km timing belt replacement interval. The hydraulic tensioner is a critical wear item; failure can cause catastrophic belt slippage. Using the specified 10W-40 oil is essential for valve train and tensioner longevity. The Magneti Marelli IAW system is generally reliable but sensitive to fuel quality and electrical integrity.
Oil Specs: Requires SAE 10W-40 meeting ACEA A3/B3 specification (Fiat Owner's Manual 1997).
Emissions: Meets EU emissions standards applicable to vehicles registered between 1996-1998 (VCA Type Approval Archive).
Power Ratings: Measured under manufacturer's internal dynamometer standards (Fiat Group PT-1997).
Fiat Technical Information System: Manual 939/B5, SIB 0939/96
Fiat Group Powertrain Specifications 1997 (PT-1997)
The Fiat 939 B5.000 was used across Fiat's Coupé and Marea platforms with transverse mounting. This engine received minor ECU updates during its production run but no major mechanical revisions that affect core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the gearbox flange (Fiat TIS 939-01). The code "939 B5.000" should be clearly visible. Visually, it can be identified by its red cam cover and twin-cam layout. Differentiation from the 1.8L (158A) is by displacement and power output; differentiation from the 2.0L 8-valve (837A) is by the DOHC head and red cam cover.
The 939 B5.000's primary reliability risk is timing belt tensioner failure, with elevated incidence in high-mileage or poorly maintained vehicles. Fiat service data indicates tensioner failure is a leading cause of catastrophic engine damage. Extended service intervals or use of non-OEM parts make preventative replacement with the updated tensioner critical.
Analysis derived from Fiat technical bulletins (1996-1998) and general industry repair data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 939-B5-000.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with FIAT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
FIAT 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
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialFIAT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
