The Fiat 8140.63 is a 2,500 cc, inline‑six turbo‑diesel engine produced between 1991 and 1998. It features direct injection, a fixed — geometry turbocharger, and a single overhead camshaft (SOHC) design. In standard form, it delivered 85 kW (115 PS) and 270 Nm of torque, providing robust pulling power for commercial applications.
Fitted primarily to the Ducato van (Type 244) and Daily light truck, the 8140.63 was engineered for durability and low — end torque in demanding…
Production years 1991–1998 meet Euro 1 standards .
The Fiat 8140.63 is a 2,500 cc inline‑six turbo‑diesel engineered for light commercial vehicles (1991-1998). It combines direct mechanical injection with a fixed‑geometry turbocharger to deliver strong low‑end pulling power and operational durability. Designed to meet Euro 1 standards, it prioritizes reliability for commercial fleets.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,500 cc | |
Fuel type | Diesel | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 87.0 mm × 92.0 mm | |
Power output | 85 kW (115 PS) | |
Torque | 270 Nm @ 2,200 rpm | |
Fuel system | Bosch VE rotary injection pump | |
Emissions standard | Euro 1 | |
Compression ratio | 22.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed‑geometry turbo (KKK or IHI) | |
Timing system | Gear-driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 380 kg |
The Fiat 8140.63 was used across Fiat's light commercial platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Daily for payload handling-and no major facelift revisions during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
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The 8140.63's primary reliability risk is diesel contamination of engine oil via injector pump seal failure, with elevated incidence in vehicles under constant heavy load. Fiat TSB-8140-003 documents this as a known service issue, while fleet maintenance logs frequently cite it as a cause for premature engine wear. High operational temperatures and extended service intervals make proactive pump inspection and oil analysis critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 8140.63 is renowned for its robust, gear-driven design and can achieve very high mileage with proper care. Its main weakness is the injector pump seal. Addressing this proactively and adhering to strict oil change intervals with the correct specification oil are key to ensuring long-term reliability in this otherwise durable engine.
The most frequent and critical issue is diesel leaking into the oil sump via the injector pump seal (TSB-8140-003). Other common problems include turbocharger oil seal leaks, glow plug system failures causing cold-start issues, and coolant leaks from the head/manifold gasket interface.
The 8140.63 turbo-diesel was primarily fitted to the second-generation Fiat Ducato (Type 244, 1990-1998) and the second-generation Fiat/Iveco Daily (Type 35, 1990-1998) in their 2.5 TD variants. It was a mainstay in Fiat's light commercial vehicle lineup during the 1990s.
Minor power gains are possible by adjusting the Bosch VE pump's maximum fuel screw, but this is not recommended. The engine and turbo were not designed for significant increases. Over-fueling drastically increases the risk of pump seal failure, turbo damage, and premature engine wear, negating any performance benefit.
Fuel economy is moderate for its era and class. In a typical Ducato van, expect figures around 9.5-11.0 L/100km (25-28 mpg UK) combined, heavily influenced by load, driving style, and vehicle condition. Its design prioritizes torque and durability over ultimate fuel efficiency.
No. The Fiat 8140.63 is a non-interference (freewheeling) engine. If the timing gears were to fail (an extremely rare event due to their robust design), the pistons and valves would not collide, preventing catastrophic internal damage.
Fiat specifies a 15W-40 mineral or semi-synthetic oil meeting the ACEA E2 standard. This specification is crucial for protecting the Bosch injection pump and ensuring proper lubrication under the high pressures and temperatures of a diesel engine. Regular changes every 10,000 km are essential.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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