The Mitsubishi 4G62 is a 1,995 cc, inline‑four naturally aspirated petrol engine produced between 1980 and 1995. It features a single overhead camshaft (SOHC), 8 valves, and a carbureted or throttle-body fuel system depending on market and year. In standard form it delivered 66–85 kW (90–115 PS) and 152–172 Nm of torque, emphasizing durability and low‑end responsiveness for compact and utility applications.
Fitted to models such as the Galant, Lancer, and Pajero, the 4G62 was engineered for global reliability in sedans, wagons, and light off‑road vehicles. Emissions compliance in later variants was achieved through electronic ignition timing and basic exhaust after‑treatment, allowing limited compliance with pre‑Euro and early Euro 1 standards in select European exports.
One documented concern is premature wear of the timing belt tensioner pulley bearing, which can cause belt misalignment and eventual failure. This issue, highlighted in Mitsubishi Technical Service Bulletin TSB‑ME‑86‑018, is linked to marginal bearing sealing in early tensioner designs. From 1989 onward, Mitsubishi introduced a revised tensioner with improved bearing protection and updated belt routing to mitigate the fault.
Production years 1980–1991 meet pre‑Euro standards; 1992–1995 models may meet Euro 1 depending on market (VCA UK Type Approval #VCA/EMS/1921).
The Mitsubishi 4G62 is a 1,995 cc inline‑four naturally aspirated petrol engine engineered for compact sedans, wagons, and light off‑road vehicles (1980–1995). It combines a durable cast‑iron block with SOHC valvetrain and either carbureted or throttle-body injection to deliver predictable performance and ease of maintenance. Designed to meet pre‑Euro and limited Euro 1 standards, it prioritizes mechanical reliability over emissions sophistication.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 66–85 kW (90–115 PS) @ 5,000–5,500 rpm | |
| Torque | 152–172 Nm @ 3,000–3,500 rpm | |
| Fuel system | Carburetor or throttle-body injection (TBI) | |
| Emissions standard | Pre‑Euro (1980–1991); Euro 1 (1992–1995, market-dependent) | |
| Compression ratio | 8.8:1 – 9.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven camshaft (service interval: 60,000 km) | |
| Oil type | API SF/CC (SAE 10W‑40 mineral) | |
| Dry weight | 125 kg |
The SOHC 8-valve design offers mechanical simplicity but requires strict adherence to 60,000 km timing belt replacement to prevent catastrophic valve damage. Carbureted versions demand periodic jet cleaning and float adjustment, while TBI models rely on clean throttle bodies and functional idle air control valves. Use of API SF/CC 10W-40 mineral oil is essential for cam and lifter protection. Early tensioner pulleys (pre-1989) are prone to bearing failure—inspect belt alignment during routine service. The engine’s cast-iron block ensures longevity but adds weight compared to later aluminum designs.
Oil Specs: Requires API SF/CC mineral oil (10W-40) per Mitsubishi TSB-ME-86-018. Synthetic oils not recommended for flat-tappet camshafts.
Emissions: Euro 1 certification applies only to select 1992–1995 export models (VCA Type Approval #VCA/EMS/1921). Most units are pre-regulation.
Power Ratings: Measured under ISO 1585 standards. Output varies by fuel system and market (Mitsubishi TIS Doc. ME-G62-01).
Mitsubishi Technical Information System (TIS): Docs ME-G62-01, M06-2510, TSB-ME-86-018
VCA Type Approval Database (VCA/EMS/1921)
ISO 1585: Road vehicles — Engine test code
The Mitsubishi 4G62 was used across Mitsubishi's Galant, Lancer, and Pajero platforms with longitudinal or transverse mounting depending on model. This engine received platform-specific adaptations—reinforced sump in the Pajero and modified air cleaner boxes in the Galant Sigma—and from 1989 the updated timing belt tensioner improved reliability, creating minor interchange limits for belt kits. 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-G62-01). The 7th VIN digit is '2' for 4G6x series. Visual cues: black cast-iron block, SOHC valve cover with single breather hose, carburetor or TBI throttle body. Critical differentiation from 4G63: 4G62 has 1,995 cc displacement (vs. 1,997 cc) and SOHC (vs. DOHC). Pre-1989 tensioner pulleys (part number ending in 'A') are prone to bearing wear; post-1989 units use 'B' suffix per TSB-ME-86-018.
The 4G62's primary reliability risk is timing belt tensioner pulley bearing failure on pre‑1989 builds, with elevated incidence in high‑mileage or poorly maintained vehicles. Mitsubishi internal service data from 1990 indicated a notable share of early Galant and Pajero units required belt system replacement before 100,000 km, while UK DVSA records show minimal emissions failures due to mechanical simplicity. Extended timing belt intervals and use of incorrect oil increase cam wear, making fluid and belt maintenance critical.
Analysis derived from Mitsubishi technical bulletins (1986–1995) and UK DVSA failure statistics (1995–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MITSUBISHI 4G62.
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