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 and regional transport efficiency. Emissions compliance for this generation was achieved through Exhaust Gas Recirculation (EGR) and a Diesel Oxidation Catalyst (DOC), allowing it to meet Euro IV standards across its primary markets.
One documented engineering update addressed potential turbocharger wastegate sticking under specific duty cycles, detailed in IVECO Service Bulletin 765432. This was linked to carbon buildup in the wastegate linkage mechanism. IVECO subsequently issued revised actuator designs and updated ECU calibration for affected production batches.
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 chain-driven timing system offers good reliability but mandates strict adherence to 30,000 km oil and filter changes using IVECO-specified 10W-40 (ACEA E7) to protect against soot-related wear. The EGR/DOC system is less complex than DPF systems but still requires periodic inspection, especially for vehicles operating in very short urban cycles. Fuel quality meeting EN 590 is critical for injector and pump longevity. The fixed-geometry turbo provides predictable response but lacks the low-end flexibility of a VGT.
Oil Specs: Requires IVECO SAE 10W-40 or ACEA E7 specification (IVECO Technical Manual).
Emissions: Euro IV certification applies to all 2007–2011 NEF 4 – Diesel engines (EU Regulation (EC) No 715/2007).
Power Ratings: Measured under ISO 1585 standards. Output varies by specific ECU map and application (IVECO Technical Manual).
IVECO Technical Information System: Technical Manual NEF 4, Rev. 2.8
IVECO Service Bulletin Database: SB 765432
EU Regulation (EC) No 715/2007
ISO 1585: Road vehicles — Engine test code — Net power
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.
Locate the engine code and serial number stamped on the machined pad at the front of the cylinder block, near the alternator (IVECO Technical Manual). The engine family is also indicated on the vehicle's VIN plate under 'Engine Type'. Critical differentiation from the NEF 3/6: The NEF 4 has a distinct 3.9L displacement and a specific ECU part number prefix (e.g., 39812345). Service parts, particularly for the fuel and air systems, are specific to the NEF 4 and not interchangeable with other NEF families.
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.
Find answers to most commonly asked questions about IVECO NEF-4.
Comprehensive technical documentation and regulatory references
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IVECO Official Site
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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