The IVECO NEF 4 – Diesel is a 3,920 cc, inline‑four turbo‑diesel engine produced between 2007 and 2011. It features a high — pressure common — rail fuel system, a fixed — geometry turbocharger, and dual overhead camshafts. In standard configurations, it delivered outputs ranging from 96 kW (130 PS) to 118 kW (160 PS), with peak torque figures between 470–500 Nm.
Fitted to medium — duty applications like the IVECO Daily and Eurocargo, the NEF 4 was engineered for urban delivery…
Production years 2007–2011 meet Euro IV standards (EU Regulation (EC) No 715/2007).
The IVECO NEF 4 – Diesel is a 3,920 cc inline‑four turbo‑diesel engineered for medium‑duty commercial vehicles (2007-2011). It combines common‑rail direct injection with a single fixed‑geometry turbocharger to deliver responsive low-end torque for stop-start driving. Designed to meet Euro IV standards, it prioritizes operational economy with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,920 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 104.0 mm × 115.0 mm | |
Power output | 96–118 kW (130–160 PS) | |
Torque | 470–500 Nm @ 1,400–2,400 rpm | |
Fuel system | Bosch Common Rail (up to 1,400 bar) | |
Emissions standard | Euro IV | |
Compression ratio | 17.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed‑geometry turbo (IHI) | |
Timing system | Chain-driven | |
Oil type | IVECO SAE 10W-40 (or equivalent ACEA E7) | |
Dry weight | 395 kg |
The IVECO NEF 4 – Diesel was used across IVECO's medium-duty platforms with longitudinal mounting. This engine received platform-specific adaptations-optimized cooling for the Daily and reinforced mounts for the Eurocargo-creating minor service part variations. All adaptations are documented in OEM technical bulletins.
The NEF 4 – Diesel's primary reliability focus is turbocharger actuator maintenance, with elevated incidence in urban/stop-start duty cycles. IVECO service data indicates a correlation between extended low-load operation and wastegate sticking, while adherence to oil change intervals is critical for long-term engine health. High soot loads from poor fuel or extended intervals make using the correct oil specification critical.
Analysis derived from IVECO technical bulletins (2007-2011) and EU regulatory maintenance guidelines. 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 NEF 4 is generally considered a robust and reliable engine for medium-duty use. Its chain-driven timing and fixed-geometry turbo are less complex than some alternatives. Long-term reliability is heavily dependent on strict adherence to maintenance, especially oil changes and EGR system care. With proper servicing using correct fluids, these engines can achieve high mileages.
The most frequently documented issues involve the turbocharger wastegate, EGR valve, and injector nozzle coking. Oil dilution from extended intervals or specific operating conditions is also a known concern if maintenance is neglected.
The NEF 4 – Diesel was used in the IVECO Daily range (50C/50D series) and the lighter variants of the Eurocargo (e.g., ML10, ML12) during its production period from 2007 to 2011.
Yes, ECU remapping is possible and can yield modest power and torque increases. However, pushing beyond factory limits increases stress on the turbo, fuel system, and drivetrain. Any tuning should be performed by a specialist and accompanied by supporting modifications and more frequent maintenance.
Fuel economy varies greatly by vehicle weight, body type, and driving cycle. In a standard Daily Van on mixed urban/rural routes, expect figures around 11-13 L/100km. Heavier or more aerodynamically compromised bodies will see higher consumption.
Yes. The IVECO NEF 4 is an interference engine. If the timing chain were to fail or jump, valve and piston collision would likely occur, resulting in significant internal engine damage. Regular oil changes are critical to prevent chain wear.
IVECO specifies a 10W-40 heavy-duty diesel engine oil meeting ACEA E7 (or the manufacturer's equivalent IVECO specification). Using the correct oil is vital for controlling soot, protecting against wear, and ensuring the longevity of the engine and emissions systems.
Comprehensive technical documentation and regulatory references
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IVECO 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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