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Mitsubishi 3G83 Specifications
| Engine Model: Mitsubishi 3G83 |
| Engine Type: 4-cycle inline 3-cylinder SOHC or DOHC liquid-cooled gasoline |
| Total Displacement: 40.1 cu.in (0.65 L) |
| Rated Engine Power: 34-64 Hp (25-47 kW) at 6000 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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| General Technical Data |
The Mitsubishi 3G83 engine is a 0.657-liter three-cylinder gasoline engine belonging to Mitsubishi’s 3G8 engine family, which powered numerous Kei-class vehicles. Produced from the early 1990s through the late 2000s, it became one of the most widely used and technically refined powerplants in the small-engine segment. The 3G83 was designed to meet Japan’s Kei car displacement regulations while offering smoothness, reliability, and fuel economy.
It was installed in vehicles such as the
Mitsubishi Minica, Minicab, Toppo, Pajero Mini, and eK Wagon. Throughout
its evolution, the engine existed in naturally aspirated and
turbocharged versions, as well as a MIVEC-equipped variant meeting Euro
4/5 emission standards. The compact, lightweight construction and low
internal friction characteristics made it a durable and efficient choice
for city transportation and light-duty applications.
The standard 3G83 featured a single overhead camshaft (SOHC) with either
6 or 12 valves depending on version, while later units adopted double
overhead camshafts (DOHC) and Mitsubishi’s variable valve timing system
known as MIVEC (Mitsubishi Innovative Valve timing Electronic Control).
This allowed improved performance and efficiency while maintaining
compliance with stricter emissions standards.
The 3G83’s strong aluminum alloy construction,
efficient cooling, and precise electronic fuel injection ensured
dependable operation and long service life even under high urban duty
cycles. With displacement under 660 cc, the engine was a technological
showcase of compact engineering efficiency.
The 3G83 is a three-cylinder, inline, water-cooled, four-stroke gasoline
engine. Total displacement is 657 cc (0.657 liters, 40.1 cubic inches)
achieved through a bore of 65.0 mm (2.56 inches) and a stroke of 66.0 mm
(2.60 inches). The compression ratio for the naturally aspirated SOHC
version is approximately 10.0:1, while MIVEC and turbocharged variants
vary between 9.0:1 and 10.4:1 depending on specification and emission
calibration.
The firing order is 1–2–3, and the crankshaft
is supported by four main bearings, ensuring low vibration and
mechanical stability. The aluminum cylinder head and block feature
cast-iron liners for wear resistance. The crankshaft is forged steel,
balanced for smooth rotation, and connected to lightweight aluminum
pistons via full-floating gudgeon pins. Connecting rods are forged steel
with fracture-split big ends for strength and weight reduction.
Early versions use a SOHC 6-valve configuration (two valves per
cylinder), later improved to a 12-valve layout (four valves per
cylinder). The DOHC MIVEC version employs four valves per cylinder with
variable valve timing and lift on the intake side. Valve operation is
via bucket tappets or hydraulic lash adjusters depending on version. The
standard camshaft drive uses a single-row timing chain with an automatic
hydraulic tensioner to minimize maintenance.
Power output for the naturally aspirated 3G83 ranges between 34 and 50
Hp (25 to 37 kW, 34 to 49 bhp) at 7,500 rpm, with torque between 51 and
60 Nm (38 to 44 lb-ft) at 5,500 rpm. Turbocharged versions produce up to
64 Hp (47 kW, 63 bhp) at 6,000 rpm with torque up to 93 Nm (69 lb-ft).
The MIVEC DOHC Euro 4/5 variant delivers 50 to 55 PS (37 to 40 kW, 49 to
54 bhp) at 7,500 rpm and torque of 63 to 65 Nm (46 to 48 lb-ft) at 6,000
rpm, while maintaining clean emissions.
Redline is set around 8,000 rpm for naturally aspirated MIVEC models and 7,000 rpm for turbocharged units. Idle speed is typically 800 ± 50 rpm. The engine complies with Japanese J-OBD and Euro 4/5 standards depending on market.
| Fuel System |
The Mitsubishi 3G83 employs an electronically controlled multi-point fuel injection (MPI) system. Fuel is supplied from an in-tank electric pump through a high-pressure line to a common fuel rail, which distributes fuel to three solenoid-type injectors mounted on the intake manifold. Each injector delivers atomized fuel directly to the intake port. Fuel pressure is regulated at approximately 300 kPa (43.5 psi) relative to manifold vacuum.
Excess fuel is returned to the tank via a return line in earlier
systems, while later models use returnless configurations to reduce
evaporative emissions. The ECU continuously adjusts injection timing and
duration based on feedback from sensors including air flow, throttle
position, oxygen, crank angle, coolant temperature, and manifold
pressure. Fuel used is unleaded gasoline with an octane rating of at
least 91 RON (87 AKI).
In the MIVEC version, the fuel system operates with advanced ECU mapping
and closed-loop lambda control to maintain stoichiometric combustion and
meet Euro 4/5 standards. Fuel injectors are high-precision multi-hole
type, optimized for fine atomization. The fuel filter replacement
interval is typically every 40,000 km (25,000 miles), and injector
cleaning or inspection is recommended every 80,000 km (50,000 miles).
| Lubrication System |
The lubrication system is a full-pressure wet-sump type using a trochoid oil pump driven by the crankshaft. Oil is drawn from the sump through a strainer and delivered under pressure to the main bearings, connecting rods, and camshaft journals. The 3G83 includes oil jets beneath each piston for cooling and to prevent detonation.
Oil pressure is about 350–500 kPa (50–72 psi) at 3,000 rpm, and around 100 kPa (15 psi) at idle. Oil capacity with filter change is approximately 2.8 liters (3.0 US quarts, 2.5 Imperial quarts). The recommended oil grade is SAE 5W-30 or 10W-30 meeting API SJ or higher. The oil filter is a spin-on cartridge type with internal bypass valve.
The positive crankcase ventilation (PCV) valve returns blow-by gases to the intake to maintain clean emissions. Oil and filter should be replaced every 10,000 km (6,000 miles) or six months under normal conditions, and every 5,000 km (3,000 miles) under severe service.
| Cooling System |
The engine uses a liquid cooling system with forced circulation. The centrifugal water pump, driven by the timing chain or auxiliary belt, circulates coolant through the block, head, and radiator. The thermostat opens at 82°C (180°F) and is fully open by 95°C (203°F). The pressurized cooling system operates at approximately 88 kPa (13 psi).
The radiator is aluminum with plastic tanks, featuring an electric cooling fan controlled by a thermostatic switch or ECU signal. Coolant capacity is around 3.2 liters (3.4 US quarts). The recommended coolant mixture is 50% ethylene glycol antifreeze and 50% distilled water, protecting against freezing down to –35°C (–31°F). Coolant replacement is required every two years or 40,000 km (25,000 miles).
| Intake and Exhaust Systems |
Naturally aspirated versions feature an aluminum intake manifold with
tuned runners for improved low-end torque. The throttle body is
cable-actuated in early versions and electronically controlled in later
models. The air cleaner uses a dry paper filter element, replaceable
every 20,000 km (12,000 miles). Turbocharged versions utilize a compact
turbocharger with an air-to-air intercooler mounted at the front of the
vehicle, delivering boost pressures around 0.7 bar (10 psi).
The MIVEC variant employs an optimized variable-length intake system
with valve timing control to improve volumetric efficiency across the
rev range. The exhaust manifold is cast iron or stainless steel, feeding
a catalytic converter located close to the exhaust ports for rapid
warm-up and effective emissions control. Later engines incorporate
secondary air injection for improved cold-start emission reduction.
Exhaust gas recirculation (EGR) is used on Euro 4/5 compliant models to
minimize nitrogen oxide emissions.
| Ignition and Electrical System |
Early 3G83 engines use a distributor-based ignition system with a single ignition coil and mechanical advance, while later models transition to distributorless ignition using three individual coil-on-plug (COP) units. Spark plug type is NGK BKR6E or equivalent, gapped at 1.0 millimeter (0.039 inch).
MIVEC engines use iridium-tipped plugs for improved durability, with replacement intervals up to 100,000 km (62,000 miles). Ignition timing, dwell, and knock control are managed electronically by the ECU. The charging system uses a 12-volt alternator rated at approximately 65 to 80 amperes. Starting system employs a 0.8 kW reduction-gear starter motor.
| Valve Timing and Drive Mechanism |
The SOHC version uses a single timing chain driving both camshaft and oil pump. The DOHC MIVEC version employs a double-overhead-camshaft configuration driven by a silent-type chain with hydraulic tensioner and chain guides.
The MIVEC mechanism uses oil pressure-actuated cam phasing and lift change to switch between low- and high-lift cam profiles at around 6,500 rpm. This improves torque at low engine speeds and enhances power at high rpm. Timing chain service interval is not specified but inspection is recommended at 150,000 km (93,000 miles).
| Dimensions and Weight |
The 3G83 engine assembly is exceptionally compact. Overall length is about 480 mm (18.9 inches), width 560 mm (22.0 inches), and height 630 mm (24.8 inches). Dry weight is approximately 68 kg (150 lbs) for SOHC versions and 75 kg (165 lbs) for MIVEC DOHC variants. The lightweight design contributes to improved front-axle load distribution and overall fuel efficiency in Kei-class vehicles. Engine mounts are rubber-isolated to minimize vibration transfer to the chassis.
| Maintenance Data |
Recommended engine oil and filter replacement every 10,000 km (6,000 miles), air filter every 20,000 km (12,000 miles), spark plugs every 40,000 km (25,000 miles) for standard types or 100,000 km (62,000 miles) for iridium types. Valve clearance should be checked every 40,000 km (25,000 miles) on mechanical lifter engines.
Coolant replacement every 2 years or 40,000 km (25,000 miles). Fuel filter should be replaced every 40,000 km (25,000 miles). Compression pressure standard is 1,250 kPa (181 psi) per cylinder, with minimum limit 980 kPa (142 psi). Idle speed is 800 ± 50 rpm. Ignition timing 10° BTDC at idle (non-MIVEC).
| Tightening Torques |
Cylinder head bolts: 25 Nm (18 lb-ft), then 50 Nm (37 lb-ft), followed
by 90° angle tightening.
Main bearing cap bolts: 40 Nm (30 lb-ft) plus 90°.
Connecting rod bolts: 30 Nm (22 lb-ft) plus 90°.
Camshaft bearing cap bolts: 10 Nm (7 lb-ft).
Flywheel bolts: 70 Nm (52 lb-ft) plus 90°.
Crankshaft pulley bolt: 160 Nm (118 lb-ft).
Oil pump bolts: 8 Nm (6 lb-ft).
Intake manifold bolts: 22 Nm (16 lb-ft).
Exhaust manifold nuts: 28 Nm (21 lb-ft).
Spark plugs: 18 Nm (13 lb-ft).
Drain plug: 35 Nm (26 lb-ft).
| Vehicle Applications |
The Mitsubishi 3G83 engine powered a wide
range of Kei-class vehicles from Mitsubishi and its OEM partners,
including:
– Mitsubishi Minica and Minica Toppo (1993–2007)
– Mitsubishi eK Wagon / eK Sport (2001–2009)
– Mitsubishi Minicab van and truck (1990s–2000s)
– Mitsubishi Pajero Mini (1994–2012)
– Mitsubishi Town Box (1999–2011)
– Mitsubishi Bravo and Bravo Van (early 1990s–2000s)
– Mitsubishi Toppo BJ (1998–2004)
The engine was also used in certain Suzuki-based models under joint
agreements. Its compact design, reliability, and smooth operation made
it ideal for light commercial and passenger vehicles. The MIVEC-equipped
3G83 was primarily fitted to higher-trim eK Sport and Pajero Mini
variants, meeting Euro 4 and Euro 5 standards with improved performance
and reduced emissions.
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