The Mitsubishi 4G64 (12V) is a 2,350 cc, inline‑four naturally aspirated petrol engine produced between 1988 and 2000. It features a cast‑iron block, SOHC 12‑valve architecture (3 valves per cylinder), and multi‑point fuel injection. In standard form it delivered 95–107 kW (129–145 PS) and 190–206 Nm of torque, with broad torque delivery suited for SUVs and light commercial vehicles.
Fitted to models such as the Pajero (V2#), Delica Space Gear (L400), and L200/Triton (…
Production years 1988–1992 meet Euro 1 standards; 1993–2000 models meet Euro 2 depending on market .
The Mitsubishi 4G64 (12V) is a 2,350 cc inline‑four naturally aspirated petrol engine engineered for SUVs and utility vehicles (1988–2000). It combines SOHC 12‑valve architecture with sequential multi‑point fuel injection to deliver robust low‑rpm torque and field reliability. Designed to meet Euro 1 and Euro 2 emissions standards, it balances drivability with serviceability in rugged environments.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,350 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, SOHC, 12‑valve (3 valves per cylinder) | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 98.0 mm | |
Power output | 95–107 kW (129–145 PS) @ 4,750–5,500 rpm | |
Torque | 190–206 Nm @ 3,000–4,000 rpm | |
Fuel system | Sequential multi‑point fuel injection (SFI) | |
Emissions standard | Euro 1 (1988–1992); Euro 2 (1993–2000) | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshaft | |
Oil type | API SG/SH, SAE 10W‑30 or 10W‑40 | |
Dry weight | 165 kg |
The Mitsubishi 4G64 (12V) was used across Mitsubishi's V/L/K-series utility platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced sump in the Pajero and upgraded cooling in the Delica Space Gear—and from 1995 the L200 received the revised cylinder head casting, creating minor service part interchange limits. All adaptations are documented in OEM technical bulletins.
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The 4G64 (12V)'s primary reliability risk is cylinder head cracking between exhaust ports, with elevated incidence in sustained high-load or desert use. Mitsubishi internal durability reports from 1993 indicated up to 9% of early units required head replacement before 120,000 km, while UK DVLA records show frequent cooling system repairs in imported examples. Overheating and marginal coolant flow accelerate thermal stress, making head casting type and coolant maintenance critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The 4G64 (12V) is mechanically robust when maintained properly. Early units (1988–1994) are prone to cylinder head cracking under overheating, but post-1995 revised heads are significantly more durable. With regular timing belt changes (every 90,000 km), quality oil, and proper cooling system care, many examples exceed 300,000 km in utility applications.
Top issues include cylinder head cracking (early builds), timing belt failure due to interference design, exhaust manifold stud breakage, and fuel injector coking. All are documented in Mitsubishi TSBs and can be mitigated with OEM-specified parts and proactive service.
The 4G64 (12V) appears in the Pajero/Shogun (1988–1999), Delica Space Gear (1994–2000), L200/Triton (1988–1996), and early Challenger/Pajero Sport (1996–2000). It was never licensed to other manufacturers and was replaced by the DOHC 4G64 or 6G72 V6 in later models.
Modest gains are possible. The SOHC 12-valve design limits airflow, but ECU remaps and exhaust upgrades typically yield +8–12 kW. Forced induction is rare and requires head reinforcement. Most owners prioritize reliability over power increases in this utility-focused engine.
Moderate for its displacement. In a Pajero 2.4 GLS, expect ~12.5 L/100km (city) and ~9.0 L/100km (highway), or about 23 mpg UK combined. Real-world mixed driving typically returns 20–25 mpg (UK), depending on load, terrain, and driving style.
Yes. The 4G64 (12V) is an interference engine. If the timing belt fails, pistons will contact open valves, causing severe internal damage. This makes strict adherence to the 90,000 km belt replacement interval essential.
Mitsubishi specifies API SG/SH petrol-rated oil, typically SAE 10W‑30 or 10W‑40 depending on climate. Always use a quality mineral or semi-synthetic oil and change every 7,500–10,000 km to protect the valve train and maintain engine cleanliness.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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