The Fiat 8140.27 is a 2,500 cc, inline‑four turbo‑diesel engine produced between 1991 and 1998. It features indirect injection, a fixed — geometry turbocharger, and a single overhead camshaft (SOHC) valvetrain. This robust unit was designed for commercial durability, delivering 76 kW (103 PS) and 225 Nm of torque for dependable load — carrying performance.
Fitted primarily to the Ducato van (Type 244) and its derivatives like the Alfa Romeo AR6, the 8140.27 was engineer…
Production years 1991–1998 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/8140).
The Fiat 8140.27 is a 2,500 cc inline‑four turbo‑diesel engineered for light commercial vehicles (1991-1998). It combines indirect injection with a fixed-geometry turbocharger to deliver strong low-end pull and mechanical simplicity. Designed to meet Euro 1 standards, it prioritizes serviceability and cost-effective operation for high-mileage use.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,500 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 93.0 mm × 92.0 mm | |
Power output | 76 kW (103 PS) @ 4,200 rpm | |
Torque | 225 Nm @ 2,400 rpm | |
Fuel system | Indirect injection (Bosch VE rotary pump) | |
Emissions standard | Euro 1 | |
Compression ratio | 22.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed-geometry turbo (KKK or IHI) | |
Timing system | Chain-driven | |
Oil type | ACEA B3/B4 (SAE 15W‑40) | |
Dry weight | 255 kg |
The Fiat 8140.27 was used across Fiat's light commercial platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Ducato Maxi-and was also supplied to Alfa Romeo for their AR6 van. All adaptations are documented in OEM technical bulletins.
The 8140.27's primary reliability risk is cylinder head cracking, with elevated incidence following coolant system neglect. Fiat internal service data indicated this was a leading cause of major engine failure in high-mileage fleets, while its simple mechanical design otherwise proved very durable. Overheating events make proactive cooling system maintenance critical.
Analysis derived from Fiat technical bulletins (1991-1998) and UK DVSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
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The 8140.27 is renowned for its mechanical robustness and longevity in commercial use, often exceeding 300,000 km. Its main weakness is the cylinder head, which can crack if the engine overheats. With a revised head fitted and diligent cooling system maintenance, it can be an extremely reliable workhorse.
The most critical issue is cylinder head cracking. Other common problems include turbocharger bearing/seal failure, wear in the Bosch VE injection pump leading to leaks or poor running, and glow plug system faults causing cold-start difficulties. These are well-documented in Fiat service literature.
The 8140.27 was primarily used in the second-generation Fiat Ducato (Type 244) vans and chassis cabs from 1991 to 1998. It was also found in badge-engineered versions: the Peugeot J5, Citroën C25, and the Alfa Romeo AR6 van during the same period.
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 can lead to excessive heat, accelerated wear, and premature failure of the head or turbo. Reliability should be prioritized over power.
Fuel economy is modest by modern standards. In a typical Ducato van, expect around 10.5-12.0 L/100km (23-27 mpg UK) combined, depending on load, driving style, and vehicle condition. Its indirect injection system prioritizes durability and torque over ultimate efficiency.
No. The Fiat 8140.27 is a non-interference engine. This means that if the timing chain were to fail or jump, the pistons will not contact the valves. While this prevents catastrophic internal damage, a broken chain will still leave you stranded and require repair.
Fiat recommends an ACEA B3 or B4 specification diesel engine oil. A 15W-40 viscosity is standard for most operating conditions. Using a high-quality oil and changing it every 10,000 km (or as per the vehicle's service schedule) is crucial for protecting the turbocharger and ensuring long engine life.
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