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Mitsubishi 4G67 Specifications
| Engine Model: Mitsubishi 4G67 |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 111.9 cu.in (1.83 L) |
| Rated Engine Power: 110-135 Hp (82-99 kW) at 6000 rpm |
| Fuel System Type: Downdraft carburetor or multi-point electronic fuel injection |
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| General Technical Data |
The Mitsubishi 4G67 is a 1.8-liter inline-four gasoline engine developed as part of Mitsubishi’s respected Sirius engine family. Produced mainly during the late 1980s and early 1990s, the 4G67 served as a versatile mid-displacement powerplant for compact and midsize passenger cars. Positioned between the smaller 4G61 and the larger 4G63, the 4G67 struck a balance between fuel economy and torque, offering stronger low-to-mid-range performance than many engines of its class.
With a cast-iron block, aluminum cylinder head,
multi-valve architecture, and electronically controlled fuel injection
in later models, the engine was engineered for durability, reliability,
and stable operation across a wide range of driving conditions. Although
it never reached the fame of the 4G63, the 4G67 remains appreciated for
its smooth delivery, long service life, and straightforward design that
is easy to diagnose, maintain, and overhaul following standard workshop
procedures.
The 4G67 engine displaces 1,834 cc (111.9 cubic inches). Its bore
measures approximately 81.5 mm (3.21 inches), while stroke is about 88.0
mm (3.46 inches), creating a long-stroke configuration that prioritizes
torque and drivability. Compression ratios vary by version, typically
ranging from 9.0:1 to 10.0:1 depending on market and fuel requirements.
Power output normally spans 110 to 135 horsepower (82 to 99 kW) at
around 6,000 rpm, while torque values fall between 160 and 165 Nm (118
to 122 lb-ft) at approximately 4,500 rpm.
Idle speed is generally stabilized at 750 - 50
rpm by the ECU in fuel-injected models. Redline occurs near 6,500 rpm.
The engine utilizes a conventional firing order of 1-3-4-2. Naturally
aspirated throughout its production, the 4G67 was offered with
carburetion or electronically controlled multi-point fuel injection
depending on model and year.
The cylinder block is cast iron, selected for rigidity, thermal
stability, and high wear resistance. The block houses thick cylinder
walls capable of supporting prolonged operation at elevated
temperatures. The forged-steel crankshaft is supported by five main
bearings for enhanced stability. The deep-skirt block design reduces
vibration and increases structural rigidity.
Pistons are cast-aluminum alloy with molybdenum-coated skirts to reduce friction during startup and thermal expansion cycles. The ring pack includes two compression rings and one oil-control ring engineered for controlled blow-by and stable lubrication. Full-floating wrist pins minimize friction under continuous duty cycles.
The connecting rods are forged steel, balanced
for smooth operation and long service life. Internal oil galleries
deliver pressurized lubrication to the crankshaft, rod bearings, piston
pins, and cylinder walls. The block is machined to workshop tolerances
that allow straightforward reconditioning, reboring, and honing during
engine overhaul.
The aluminum cylinder head incorporates a dual overhead camshaft (DOHC)
layout operating four valves per cylinder, providing a total of sixteen
valves. This multi-valve configuration enhances volumetric efficiency
and supports strong mid-range power. The head design employs
bucket-over-shim tappets. Valve clearances must be checked and adjusted
according to workshop procedure at scheduled intervals unless hydraulic
lash adjusters are installed in certain regional variants.
The pent-roof combustion chamber shape encourages efficient combustion, controlled flame propagation, and reduced knock tendency. Intake ports are shaped for high airflow velocity, while exhaust ports are optimized for rapid evacuation of gases. Camshafts are belt-driven, and the timing belt requires periodic replacement according to service specifications.
Hardened valve seats and guides ensure durability, especially in extended-temperature operation. Coolant passages cast within the head manage heat transfer and minimize localized hot spots that could reduce cylinder-head-gasket life.
| Fuel System |
Depending on year and model, the 4G67 was offered in carbureted or multi-point fuel-injected configurations. Carbureted versions use a vacuum-controlled downdraft carburetor with staged throttles for balanced low-speed response and improved high-rpm flow. Fuel-injected versions feature electronically controlled injectors mounted in the intake manifold runners.
An electric fuel pump supplies fuel to a pressurized rail, maintaining 300 to 350 kPa (43 to 51 psi). The ECU adjusts injection timing and duration using data from sensors including the mass-airflow sensor, throttle-position sensor, coolant-temperature sensor, oxygen sensor, and crankshaft-angle sensor.
Recommended fuel is unleaded gasoline with an octane rating of at least 92 RON (87 AKI), though higher octane improves knock resistance. Proper fuel-system maintenance includes periodic cleaning of injectors, replacement of fuel filters, and inspection of vacuum hoses for carbureted models.
| Lubrication System |
The lubrication system is a full-pressure wet-sump type using a crankshaft-driven trochoid oil pump. Oil is drawn through a metal pickup screen, filtered through a full-flow spin-on oil filter, and distributed via internal galleries to all primary bearings, camshafts, and valve-train components. Oil capacity typically ranges from 3.8 to 4.2 liters (4.0 to 4.4 US quarts) depending on oil-pan design.
Recommended oil viscosity varies by climate but generally includes 5W-30, 10W-30, or 10W-40 meeting API specifications. Normal oil pressure ranges from 300 to 400 kPa (44 to 58 psi) at cruising speed, with idle pressure around 100 kPa (15 psi).
The crankcase-ventilation system uses a PCV valve to regulate internal pressure, reduce emissions, and prevent sludge formation. Workshop procedures include periodic PCV valve inspection, oil-pump clearance measurements during overhauls, and verification of oil-pressure output.
| Cooling System |
Cooling is managed by a belt-driven centrifugal water pump, aluminum radiator, thermostat, and electric cooling fans. Coolant flows through passages in the block and head, removing heat generated during combustion. The thermostat begins opening around 82 C (180 degrees F) and reaches full opening near 95 C (203 degrees F).
Cooling-system pressure is typically 12 to 15 psi. Total coolant capacity averages 6.0 liters (6.3 US quarts). A 50/50 mixture of ethylene glycol and distilled water is recommended for corrosion protection and temperature stability. Temperature sensors provide data to the ECU, enabling adaptive timing and fueling strategies in fuel-injected variants.
Workshop maintenance includes periodic coolant flushing, radiator inspection, and water-pump seal checks. Overheating issues are commonly related to deteriorated hoses, worn thermostats, or blocked radiator cores.
| Intake and Exhaust Systems |
The induction system includes a high-flow air filter, intake ducting, and an intake manifold cast from aluminum or molded composite material depending on variant. Runner lengths are tuned for mid-range torque. Throttle actuation varies from mechanical cable operation to electronically monitored systems in later models.
Exhaust manifolds are cast iron for durability and thermal strength. Exhaust gases pass through catalytic converters designed to meet emissions regulations. Oxygen sensors ensure proper fuel-trim adjustment during closed-loop operation. Performance variants may use freer-flowing exhaust components to improve mid-range breathing. Workshop service includes inspection for intake-manifold vacuum leaks, exhaust-manifold cracking, and catalytic-converter restriction.
| Ignition and Electrical System |
Ignition systems differ by year and model. Early models use a distributor with vacuum and centrifugal advance mechanisms. Later 4G67 engines employ electronic distributor assemblies and ECU-controlled ignition advance. Spark plugs generally feature copper or platinum cores, gapped around 0.9 to 1.1 mm (0.035 to 0.043 inches).
Ignition timing is set according to workshop instructions using timing-light equipment and ECU diagnostic mode activation. Alternators produce 60 to 75 amperes. The starter motor is a reduction-gear design providing high cranking torque. Electrical harnesses use heat-resistant insulation, and routine inspection includes testing ground connections, load-testing the charging system, and inspecting ignition-coil output for wear.
| Other Systems |
Additional systems integrated into the 4G67 include the PCV emissions-control system, EVAP fuel-vapor recovery, and EGR where required. Accessory drives power the alternator, power-steering pump, and air-conditioning compressor. Engine mounts use rubber or hydraulic damping to reduce vibration transfer.
Sensors-including knock sensors, coolant-temperature sensors, airflow meters, and throttle-position sensors-provide the ECU with operational data. Workshop procedures often involve sensor-output testing, vacuum-line inspection, and accessory-belt adjustment or replacement.
| Dimensions and Weight |
The Mitsubishi 4G67 engine features compact dimensions suitable for front-wheel-drive applications. Typical length is approximately 630 mm (24.8 inches), width around 550 mm (21.7 inches), and height roughly 650 mm (25.6 inches). Dry weight generally ranges from 115 to 135 kg (254 to 298 lbs) depending on induction system and accessories. Despite its moderate weight, the cast-iron block contributes significant structural rigidity and long service life.
| Maintenance Data |
Routine maintenance includes oil and filter changes every 5,000 to 7,500 km (3,000 to 4,600 miles). Air-filter replacement occurs every 15,000 to 20,000 km (9,000 to 12,000 miles). Spark-plug inspection is recommended every 20,000 km, with replacement between 30,000 and 60,000 km (18,000 to 37,000 miles). Coolant should be replaced every two years or every 40,000 km (25,000 miles).
Timing-belt replacement is required every 90,000 to 100,000 km (56,000 to 62,000 miles). Workshop tasks include valve-clearance checks, compression testing, and fuel-system cleaning for carbureted models. Proper maintenance ensures stable performance, long engine life, and consistent efficiency.
| Tightening Torques |
Cylinder-head bolts require staged tightening beginning at approximately 30 Nm (22 lb-ft) followed by specified angular increments. Main-bearing-cap bolts tighten to 65 to 75 Nm (48 to 55 lb-ft). Connecting-rod bolts require approximately 40 Nm (30 lb-ft) plus angle tightening. Spark plugs tighten to roughly 18 to 20 Nm (13 to 15 lb-ft).
Oil-drain plugs typically require 35 Nm (26 lb-ft). Intake-manifold bolts should be tightened to 22 to 25 Nm (16 to 18 lb-ft). Exhaust-manifold bolts use a similar torque range of 25 to 30 Nm (18 to 22 lb-ft). Following correct torque specifications ensures mechanical reliability and prevents thread damage.
| Vehicle Applications |
The Mitsubishi 4G67 engine was widely used in vehicles such as the Mitsubishi Galant, Mirage, Lancer, Colt, and various regional-market sedans and coupes. Its balanced torque characteristics, moderate displacement, and dependable operation made it suitable for a variety of compact and midsize applications.
The engine also appeared in rebadged models produced under Mitsubishi’s global manufacturing agreements. Its longevity, ease of maintenance, and straightforward workshop procedures continue to make the 4G67 a practical and serviceable engine in markets where it remains in use.
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