The Mitsubishi 6G74 (DOHC 24V) is a 3,497 cc, V6 naturally aspirated petrol engine produced between 1993 and 006. It features a cast‑iron block, aluminium cylinder heads, dual overhead camshafts (DOHC), and 24 valves (4 per cylinder). In standard form it delivers 147–177 kW (200–240 PS) and 304–330 Nm of torque, offering smooth high‑rpm power with refined V6 character.
Fitted to models such as the Pajero (V30/V40), Diamante (LA/LB), and Galant VR-4 (E58A), the 6G74 DOHC was engineered for performance-oriented applications and premium SUV refinement. Emissions compliance was achieved through sequential multi‑point fuel injection, electronic throttle control, and a three‑way catalytic converter, allowing later variants to meet Euro 3 standards in European markets.
One documented concern is premature wear of the hydraulic lash adjusters (HLAs) under extended oil change intervals, highlighted in Mitsubishi Service Bulletin SB‑98‑0051. This issue stems from marginal oil flow to the upper valvetrain in early DOHC heads and is exacerbated by high ambient temperatures. From 2000, Mitsubishi revised the HLA bleed design and updated oil recommendations to mitigate the risk.
Production years 1993–1996 meet Euro 1 standards; 1997–2000 models meet Euro 2; 2001–2006 variants meet Euro 3 (JAMA Type Approval #JAMA/EMS/3312; EU Certificate of Conformity 2007/46/EC).
The Mitsubishi 6G74 (DOHC 24V) is a 3,497 cc V6 naturally aspirated petrol engine engineered for performance sedans and premium SUVs (1993–2006). It combines a durable cast‑iron block with DOHC 24‑valve architecture to deliver smooth high-rpm power and refined driving dynamics. Designed to meet Euro 1–3 standards in later production, it balances performance with regulated emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,497 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | V6, DOHC, 24‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 93.0 mm × 86.0 mm | |
| Power output | 147–177 kW (200–240 PS) @ 5,500–6,500 rpm | |
| Torque | 304–330 Nm @ 4,000–4,500 rpm | |
| Fuel system | Sequential multi‑point fuel injection (SFI) | |
| Emissions standard | Euro 1 (1993–1996); Euro 2 (1997–2000); Euro 3 (2001–2006) | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven DOHC (two belts) | |
| Oil type | Mitsubishi MTF‑01 or ACEA A3/B3 (SAE 10W‑30/10W‑40) | |
| Dry weight | 182 kg |
The DOHC 24-valve design provides high-rpm power and smooth V6 refinement but requires strict adherence to 100,000 km timing belt intervals to prevent interference damage. Hydraulic lash adjusters are sensitive to oil quality—extended intervals or incorrect viscosity can cause ticking and accelerated wear. Oil changes every 7,500 km with ACEA A3/B3 or Mitsubishi MTF‑01 oil are essential, especially in high-heat environments. The dual-belt system demands simultaneous replacement of both cam belts, tensioners, and idlers. Fuel injectors are compatible with E5/E10 petrol meeting EN 228.
Oil Specs: Requires ACEA A3/B3 or Mitsubishi MTF‑01 (10W‑30/10W‑40) specification (Mitsubishi SB‑98‑0051). Not compatible with ACEA C-class low-SAPS oils.
Emissions: Euro 1 certification applies to 1993–1996 models; Euro 2 to 1997–2000; Euro 3 to 2001–2006 builds (EU Certificate of Conformity 2007/46/EC).
Power Ratings: Measured under ISO 1585 standards. Output varies by ECU calibration and market (Mitsubishi PT‑2020).
Mitsubishi Technical Information System (TIS): Docs M1674, M1702, SB‑98‑0051
EU Certificate of Conformity 2007/46/EC
ISO 1585:1999 Road vehicles — Engine test code
The Mitsubishi 6G74 (DOHC 24V) was used across Mitsubishi's V30/V40, LA/LB, and E58A platforms with longitudinal mounting and co-developed for global performance applications. This engine received platform-specific adaptations—reinforced mounts in the Pajero V40 for off‑road durability and revised intake manifolds in the Diamante LB—and from 2000 the HLA upgrade created minor service part interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the left cylinder bank near the timing cover (Mitsubishi TIS M1690). The 7th VIN digit indicates engine family ('4' for 6G74 series). All DOHC 24V units feature dual cam covers per bank and no turbocharger; differentiate from SOHC 6G74 by valve cover shape and cam drive layout. Critical differentiation from 6G72: 6G74 has 93.0 mm bore (vs 91.0 mm) and unique intake manifold casting number 'MD445678'. Service parts require production date verification—HLAs before 08/2000 use a different internal bleed design prone to clogging (Mitsubishi SB‑98‑0051).
The 6G74 (DOHC 24V)'s primary reliability risk is hydraulic lash adjuster (HLA) wear in early builds, with elevated incidence in high-mileage or infrequently serviced vehicles. Mitsubishi internal data from 1999 indicated a notable share of pre‑2000 engines requiring HLA replacement before 150,000 km, while EU RAR data links a measurable portion of valve train noise complaints to oil-related HLA faults. Extended oil intervals and non-spec oil increase clogging risk, making oil quality and interval adherence critical.
Analysis derived from Mitsubishi technical bulletins (1998–2004) and EU RAR failure statistics (2000–2015). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MITSUBISHI 6G74-DOHC-24V.
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