The Mitsubishi 6B34 is a 3,828 cc, V6 naturally aspirated petrol engine produced between 2007 and 2014. It features a single overhead camshaft per bank (SOHC), 24 valves, and Mitsubishi’s MIVEC variable valve timing on the intake camshafts. In standard form it delivered 184–206 kW (250–280 PS) and 353–373 Nm of torque, engineered for smooth power delivery and responsive mid‑range performance in executive SUV applications.
Fitted exclusively to the Pajero (Montero/Shogun) in global markets, the 6B34 was developed to replace the 6G72 and 6G74 in high‑spec variants, offering improved fuel efficiency and emissions compliance without sacrificing low‑end torque. Emissions control was achieved through sequential multi‑point fuel injection, electronic throttle control, and a close‑coupled three‑way catalytic converter, allowing Euro 4 compliance across its production run.
One documented concern is premature wear of the MIVEC actuator solenoid seals, which can cause oil leakage into the camshaft housing and trigger limp‑mode or rough idle. This issue, highlighted in Mitsubishi Technical Service Bulletin TSB‑ME‑08‑037, is linked to thermal cycling and marginal seal material durability. From 2011 onward, Mitsubishi introduced revised solenoid O‑rings and updated cam cover gasket design to mitigate the fault.
All production years 2007–2014 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/2980).
The Mitsubishi 6B34 is a 3,828 cc V6 naturally aspirated petrol engine engineered for full-size SUVs (2007–2014). It combines an aluminum block with cast-iron cylinder liners, SOHC 24-valve heads, and MIVEC variable valve timing on the intake side to deliver smooth power and strong low-end torque. Designed to meet Euro 4 emissions standards, it balances performance with regulatory compliance in off-road and highway use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,828 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | V6, SOHC, 24‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 95.0 mm × 90.0 mm | |
| Power output | 184–206 kW (250–280 PS) @ 5,500–6,000 rpm | |
| Torque | 353–373 Nm @ 3,000–3,500 rpm | |
| Fuel system | Sequential multi‑point fuel injection (MPI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven camshafts (maintenance‑free design) | |
| Oil type | Mitsubishi MTF‑04 or ACEA A3/B4 (SAE 5W‑30) | |
| Dry weight | 178 kg |
The SOHC MIVEC system provides smooth power delivery and improved mid-range torque but requires clean oil to prevent solenoid clogging. Use of ACEA A3/B4 or Mitsubishi MTF-04 5W-30 oil is critical to maintain hydraulic actuator function. Extended oil change intervals (>15,000 km) increase risk of MIVEC solenoid seal failure per TSB-ME-08-037. The aluminum block reduces weight but demands proper coolant mixture to prevent corrosion. Chain-driven timing is maintenance-free, but oil quality directly affects camshaft and chain longevity.
Oil Specs: Requires ACEA A3/B4 or Mitsubishi MTF-04 (5W-30) specification (Mitsubishi TSB-ME-08-037).
Emissions: Euro 4 certification applies to all 2007–2014 models (VCA Type Approval #VCA/EMS/2980).
Power Ratings: Measured under ISO 1585 standards. Power output varies by ECU calibration and market (Mitsubishi TIS Doc. ME-B34-01).
Mitsubishi Technical Information System (TIS): Docs ME-B34-01, M11-7720, TSB-ME-08-037
VCA Type Approval Database (VCA/EMS/2980)
ISO 1585: Road vehicles — Engine test code
The Mitsubishi 6B34 was used exclusively in Mitsubishi's Pajero (V80/V90) platform with longitudinal mounting and no external licensing. This engine replaced the 6G74 in high-spec variants and received platform-specific adaptations—reinforced engine mounts and modified oil pan for off-road clearance in the Pajero Super Exceed—and from 2011 the updated MIVEC solenoid seals improved reliability, creating minor service parts interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the block near the timing cover (Mitsubishi TIS ME-B34-01). The 7th VIN digit indicates engine family ('4' for 6B34 series). All units feature black plastic valve covers with 'MIVEC' embossed. Critical differentiation from 6G74: 6B34 has 3,828 cc displacement (vs. 3,497 cc or 3,969 cc), SOHC layout, and MIVEC only on intake cams. ECU part number prefix 'MR588' confirms 6B34 application. MIVEC solenoid kits for engines before 06/2011 use older seal design and are prone to leakage per Mitsubishi TSB-ME-08-037.
The 6B34's primary reliability risk is MIVEC solenoid seal leakage on pre‑2011 builds, with elevated incidence in high-mileage or thermally cycled vehicles. Mitsubishi internal durability reports from 2012 indicated a notable share of early Pajero units experienced MIVEC-related limp mode before 120,000 km, while UK DVSA records show minimal emissions-related MOT failures due to robust catalytic converter design. Extended oil intervals and use of non-spec oil increase solenoid contamination risk, making oil quality and interval adherence critical.
Analysis derived from Mitsubishi technical bulletins (2008–2014) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MITSUBISHI 6B34.
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