The Volvo B 5204 FS is a 1,984 cc, inline‑five naturally aspirated petrol engine produced between 1993 and 1998. It features a dual overhead camshaft (DOHC) and four valves per cylinder, delivering smooth power delivery and strong mid-range torque. The engine utilizes multi-point fuel injection and a variable intake manifold to produce 105 kW (143 PS) and 185 Nm of torque, enabling refined acceleration.
Fitted to the Volvo 850 and S70/V70 platforms, the B 5204 FS was engineered for drivers seeking a blend of fuel economy, smooth power delivery, and premium refinement. Emissions compliance was achieved through advanced engine management and a close-coupled catalytic converter, meeting Euro 2 standards from launch.
One documented concern is premature failure of the plastic intake manifold, which can lead to coolant leaks and potential engine overheating. This issue, referenced in Volvo Service Bulletin FS-95-12, is often linked to material degradation under sustained thermal cycling. Volvo addressed this with a revised, all-aluminum manifold design in later production.
Production years 1993–1998 meet Euro 2 emissions standards across all markets (EU Directive 91/441/EEC).
The Volvo B 5204 FS is a 1,984 cc inline‑five naturally aspirated petrol engine engineered for executive sedans and wagons (1993-1998). It combines multi-point fuel injection with a variable intake manifold to deliver smooth, linear power and efficient cruising. Designed to meet Euro 2 standards from launch, it balances responsive performance with emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑5, DOHC, 20‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 77.0 mm | |
| Power output | 105 kW (143 PS) | |
| Torque | 185 Nm @ 4,200 rpm | |
| Fuel system | Multi-point fuel injection (Bosch LH2.4) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven camshafts | |
| Oil type | SAE 5W-30 or 10W-30 mineral/semi-synthetic oil | |
| Dry weight | 145 kg |
The inline-five configuration provides inherent smoothness and strong mid-RPM torque, ideal for relaxed highway cruising. However, it requires vigilant 60,000 km timing belt changes to prevent catastrophic interference damage. Using a quality detergent oil (SAE 5W-30/10W-30) is critical. The plastic intake manifold demands periodic inspection for coolant leaks; pre-1996 units should have the manifold replaced with the aluminum version per Volvo SIB FS-95-12. Ignition components should be replaced every 80,000 km.
Oil Specs: Requires detergent mineral or semi-synthetic oil (SAE 5W-30 or 10W-30) (Volvo Owner's Manual 1993). Modern synthetics are acceptable.
Emissions: Euro 2 certification applies to all model years (1993-1998) for all markets (EU Directive 91/441/EEC).
Power Ratings: Measured under DIN 70020 standards per period norms (Volvo PT-1996). Output is consistent across markets.
Volvo Technical Information System (TIS): Workshop Manuals 850/S70/V70
Volvo Electronic Parts Catalogue (EPC) Documentation
EU Directive 91/441/EEC
Volvo Service Bulletin FS-95-12
The Volvo B 5204 FS was used across Volvo's 850 and P80 platforms with transverse mounting. This engine received minor ECU tuning for different markets, but no major platform-specific adaptations that affect core compatibility. All variants share the same block, head, and mounting points. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the front of the engine block, near the timing cover (Volvo Workshop Manual). The code will read "B5204FS". Visually, it is an aluminum block engine with a plastic cam cover and a distinctive five-cylinder layout. It is distinct from the turbocharged B5254T engines by the absence of a turbocharger and from the earlier B5234 engines by its smaller displacement. Service parts for the B 5204 FS are generally compatible across all 850/S70/V70 applications from 1993-1998, but ECU software and emissions components may vary by market.
The B 5204 FS's primary reliability risk is plastic intake manifold failure, with elevated incidence in high-mileage or pre-1996 examples. Volvo internal service data indicated this was a common cause of coolant-related complaints and potential engine damage. Additionally, the timing belt is critical due to the interference design. Strict adherence to maintenance intervals is critical for longevity.
Analysis derived from Volvo technical bulletins (1993-1998) and aggregated workshop repair data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-5204-FS.
Comprehensive technical documentation and regulatory references
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VOLVO 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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