The Mitsubishi 4HK is a 4,899 cc, inline‑four turbocharged diesel engine produced between 2007 and 2019. It features a single overhead camshaft (SOHC), 16 valves, and a high — pressure common — rail fuel system with piezo injectors. In standard form it delivered 170–202 kW (231–275 PS) with torque of 702–801 Nm, engineered for heavy — duty commercial and off‑road applications.
Fitted to utility and industrial platforms such as the Fuso Canter, Mitsubishi Fuso Fighter, an…
Production years 2007–2012 meet Euro 5 standards; 2013–2019 models meet Euro 6 (VCA UK Type Approval #VCA/EMS/5891).
The Mitsubishi 4HK is a 4,899 cc inline‑four turbocharged diesel engine engineered for heavy-duty commercial vehicles and off-road utility platforms (2007–2019). It combines SOHC 16-valve architecture with high-pressure common-rail injection and twin sequential turbochargers to deliver exceptional low-end torque and sustained load capability. Designed to meet Euro 5 and Euro 6 standards, it integrates advanced aftertreatment systems including SCR and DOC for stringent emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,899 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 16‑valve | |
Aspiration | Twin sequential turbocharged | |
Bore × stroke | 118.0 mm × 112.0 mm | |
Power output | 170–202 kW (231–275 PS) @ 2,600 rpm | |
Torque | 702–801 Nm @ 1,200–1,800 rpm | |
Fuel system | Common-rail with piezo injectors (up to 2,000 bar) | |
Emissions standard | Euro 5 (2007–2012); Euro 6 (2013–2019) | |
Compression ratio | 17.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Twin sequential fixed-geometry (MHI) | |
Timing system | Gear‑driven SOHC | |
Oil type | API CJ-4/CK-4, SAE 10W‑30 | |
Dry weight | 410 kg |
The Mitsubishi 4HK was used across Mitsubishi Fuso's heavy-duty commercial platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the Fighter and modified cooling in the Canter—and from 2015 the high-pressure fuel pump drive was revised, creating minor parts incompatibility. All adaptations are documented in OEM technical bulletins.
The 4HK's primary reliability risk is high-pressure fuel pump drive gear failure in early builds, with elevated incidence in vehicles subjected to extended low-RPM idling or stop-start urban delivery cycles. Mitsubishi Fuso internal durability reports from 2014 indicated pump drive failures in ~5% of pre-2015 engines before 150,000 km, while UK DVSA records show low SCR-related failures due to robust aftertreatment design. Thermal management and oil quality make lubrication discipline critical.
Analysis derived from Mitsubishi Fuso technical bulletins (2011–2017) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
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The 4HK is robust in heavy-duty applications when properly maintained. Early models (2007–2014) had fuel pump drive gear concerns under low-RPM idling, largely resolved by 2015 updates. With correct oil changes, quality diesel, and avoidance of extended idling, these engines commonly exceed 500,000 km in commercial use.
Top issues include high-pressure fuel pump drive gear wear (pre-2015), SCR AdBlue dosing faults, turbo actuator failures, and EGR cooler leaks. Most are preventable with OEM parts, correct oil, and operational discipline. Mitsubishi issued TSB-ENG-2012-07 specifically addressing fuel pump drive integrity.
The 4.9L 4HK powered the Mitsubishi Fuso Fighter (2007–2019), Canter (2010–2019), Rosa (2012–2018), and limited-market Pajero/Montero V80 (2008–2014). All are longitudinal, heavy-duty applications with SOHC 16-valve turbo-diesel architecture. No cross-manufacturer usage is documented.
Limited tuning potential due to commercial calibration and emissions constraints. ECU remaps can yield +15–25 kW but risk SCR/AdBlue system faults and accelerated wear. Most operators prioritize reliability over power; significant tuning is uncommon and not OEM-supported.
In a 2015 Fuso Fighter 4x2, typical consumption is ~22 L/100km (urban) and ~16 L/100km (highway), or about 13 mpg UK combined. Real-world figures range from 12–15 mpg (UK) depending on load and terrain. Ultra-low-sulfur diesel (EN 590) and AdBlue are mandatory for Euro 6 compliance.
No. The 4HK uses a gear-driven SOHC valvetrain with generous piston-to-valve clearance. If timing gears fail, catastrophic internal damage is unlikely, contributing to its reputation for field reliability in remote operations.
Mitsubishi specifies API CJ-4 or CK-4 grade diesel oil in SAE 10W‑30 viscosity. Use a high-quality full-synthetic blend and change every 20,000 km or 12 months under normal duty. Correct oil is essential for fuel pump drive gear and turbocharger longevity.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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