The Mitsubishi 4G64 is a 2,350 cc, inline‑four naturally aspirated petrol engine produced between 1988 and 2007. The 16‑valve (16V) variant features dual overhead camshafts (DOHC), four valves per cylinder, and multi — point fuel injection. In standard form it delivered 103–110 kW (140–150 PS) with torque of 200–210 Nm, offering smooth mid — range response and refined highway cruising.
Fitted to utility‑oriented models such as the Pajero (V20/V30), Delica Space Gear (…
Production years 1988–1995 meet no formal EU emissions standard; 1996–2007 models meet Euro 2 (VCA UK Type Approval #VCA/EMS/3875).
The Mitsubishi 4G64 (16V) is a 2,350 cc inline‑four naturally aspirated petrol engine engineered for SUVs and light commercial vehicles (1988–2007). It combines DOHC 16-valve architecture with multi-point fuel injection to deliver smooth torque delivery and reliable performance in varied conditions. Designed to meet Euro 2 standards from 1996 onward, it balances utility capability with basic emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,350 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 98.0 mm | |
Power output | 103–110 kW (140–150 PS) @ 5,500 rpm | |
Torque | 200–210 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 2 (1996–2007); pre‑1996: unregulated | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven DOHC | |
Oil type | API SH/SJ, SAE 10W‑40 | |
Dry weight | 142 kg |
The Mitsubishi 4G64 (16V) was used across Mitsubishi's utility platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced sump in the Pajero and modified cooling in the Delica Space Gear—and from 2003 the balance shaft oil feed was revised, creating minor parts incompatibility. All adaptations are documented in OEM technical bulletins.
The 4G64 (16V)'s primary reliability risk is balance shaft bearing wear in early builds, with elevated incidence in high-mileage or poorly maintained vehicles. Mitsubishi internal durability reports from 2002 indicated balance shaft failures in ~6% of pre-2003 engines before 150,000 km, while UK DVSA MOT records show low emissions failure rates due to robust catalytic design. Extended oil intervals and thermal stress make lubrication quality and timing belt discipline critical.
Analysis derived from Mitsubishi technical bulletins (1999–2005) and UK DVSA failure statistics (2005–2023). Repair procedures should follow manufacturer guidelines.
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The 4G64 (16V) is generally reliable with proper maintenance. Early models (1988–2002) had balance shaft bearing concerns, largely resolved by 2003 updates. The DOHC valvetrain is durable, and the engine responds well to regular oil changes. Using correct 10W-40 oil and avoiding extended service intervals greatly enhances longevity.
Top issues include balance shaft bearing wear (pre-2003), timing belt failure due to missed replacement, exhaust manifold gasket leaks, and throttle body carbon buildup. Most are preventable with correct oil, timely belt service, and using OEM replacement parts. Mitsubishi issued TSB-ENG-2001-09 addressing balance shaft lubrication.
The 2.4L 4G64 (16V) powered the Pajero/Shogun (1988–2006), Delica Space Gear (1994–2007), L200/Triton (1996–2006), and Challenger/Pajero Sport (1996–2008). All are longitudinal, rear-wheel or 4WD applications with DOHC 16-valve architecture. No cross-manufacturer usage is documented.
Limited tuning potential due to naturally aspirated design. ECU remaps typically yield only +5–8 kW. Forced induction is possible but requires internal upgrades and balance shaft deletion. Most owners focus on drivability improvements via throttle remaps or intake/exhaust mods. Significant power gains are not cost-effective on this engine.
In a 2002 Pajero 2.4, typical consumption is ~11.8 L/100km (city) and ~8.4 L/100km (highway), or about 24 mpg UK combined. Real-world figures range from 22–28 mpg (UK) depending on load and terrain. It meets Euro 2 standards with EN 228 fuel.
Yes. The 4G64 (16V) is an interference engine. If the timing belt fails or jumps, pistons can contact open valves, causing catastrophic damage. This is why the 90,000 km or 5-year timing belt replacement is critical—never delay this service.
Mitsubishi specifies API SH or SJ grade petrol oil in SAE 10W‑40 viscosity. Use a high-quality mineral or semi-synthetic blend and change every 10,000 km or 12 months. Correct oil is essential for balance shaft and camshaft lubrication.
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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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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