The Mitsubishi 4D56 — T is a 2,477 cc, inline‑four turbo‑diesel engine produced between 1986 and 2008. It features a cast‑iron block, indirect injection (pre‑1993) or direct injection (post‑1993), and a single wastegate‑controlled turbocharger. In standard form it delivers 63–85 kW (85–115 PS) and 192–235 Nm of torque, offering robust low‑end pulling power suited to light commercial and off‑road use.
Fitted to models such as the Pajero (V20/V30/V40), L200/Triton (K…
Production years 1986–1992 meet no formal EU emissions standard; 1993–2000 models meet Euro 1; 2001–2008 variants meet Euro 2 (JAMA Type Approval #JAMA/EMS/3412; EU Certificate of Conformity 2007/46/EC).
The Mitsubishi 4D56-T is a 2,477 cc inline‑four turbo‑diesel engineered for SUVs and pickup trucks (1986–2008). It combines a durable cast‑iron block with either indirect or direct fuel injection to deliver strong low‑rpm torque and off‑road reliability. Designed to meet Euro 1–2 standards in later production, it balances ruggedness with basic emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,477 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve (pre‑1993); DOHC, 16‑valve (post‑1993) | |
Aspiration | Turbocharged (wastegate-controlled) | |
Bore × stroke | 91.1 mm × 95.0 mm | |
Power output | 63–85 kW (85–115 PS) @ 4,000–4,500 rpm | |
Torque | 192–235 Nm @ 2,000–2,500 rpm | |
Fuel system | Bosch VE mechanical pump (pre‑1993); Denso ECD‑V3 electronic DI (post‑1993) | |
Emissions standard | Euro 1 (1993–2000); Euro 2 (2001–2008) | |
Compression ratio | 21.0:1 (indirect); 18.5:1 (direct) | |
Cooling system | Water‑cooled | |
Turbocharger | IHI RHB5 (early); Mitsubishi TD04 (later) | |
Timing system | Gear‑driven camshaft (SOHC); chain‑driven DOHC (post‑1993) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 225 kg |
The Mitsubishi 4D56-T was used across Mitsubishi's V20/V30, K74/K84, and L300/L400 platforms with longitudinal mounting and co-developed for global markets. This engine received platform-specific adaptations—reinforced sump in the L200 for off‑road clearance and revised cooling in the Pajero V40—and from 1993 the DI upgrade created mechanical and ECU interchange limits. Partnerships enabled shared use in Hyundai Galloper and Dodge Ram 50 with identical architecture. All adaptations are documented in OEM technical bulletins.
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The 4D56-T's primary reliability risk is fuel injection pump wear in early indirect-injection variants, with elevated incidence in high-ambient-temperature or high-idle applications. Mitsubishi internal data from 1995 indicated a notable share of pre‑1993 engines requiring pump replacement before 150,000 km, while EU RAR data links a measurable portion of drivability complaints to fuel contamination in non‑filtered systems. Extended idling and poor fuel quality increase pump wear, making filtration and fuel quality critical.
Analysis derived from Mitsubishi technical bulletins (1994–2005) and EU RAR failure statistics (2000–2015). 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 4D56-T is renowned for ruggedness, especially post-1993 DI variants. Early indirect-injection models require vigilant fuel filtration and pump maintenance. With proper oil changes, clean diesel, and turbo cooldown, many examples exceed 300,000 km without major issues.
Top issues include Bosch VE pump wear (pre-1993), turbo oil seal leaks, cylinder head cracking in early DI models, and glow plug controller failures. These are documented in Mitsubishi service bulletins SB‑94‑0018 and TIS updates.
The 2.5L turbo diesel appeared in the Pajero/Shogun (1986–2006), L200/Triton (1986–2008), and Delica (1986–2007). It was also used by Hyundai in the Galloper (1991–1997) and by Dodge in the Ram 50 under OEM licensing. Later models meet Euro 2 standards.
Yes. Mechanical pumps can be recalibrated for +15–20 kW; DI variants support ECU remaps yielding +20–25 kW. Upgraded intercoolers, exhaust, and boost controllers are common. However, head gasket and head integrity should be verified before aggressive tuning.
Robust for its era. In a Pajero 2.5 TD, expect ~9.5 L/100km (city) and ~7.2 L/100km (highway), or about 33 mpg UK combined. Real-world mixed driving typically returns 28–35 mpg (UK), depending on load, terrain, and maintenance.
No. The 4D56-T is a non-interference engine. If the timing gears or chain fail, piston-to-valve contact will not occur, reducing catastrophic failure risk. This contributes to its reputation for mechanical tolerance.
Mitsubishi specifies API CF-4 or ACEA B3 diesel oil in SAE 10W‑30 or 15W‑40 viscosity. Modern low-SAPS (ACEA C) oils should be avoided as they lack sufficient anti-wear additives for older diesel pumps. Change every 7,500 km in severe conditions.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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.
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Type-approval guidance and documentation.
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