The Mitsubishi 4G52 is a 1,995 cc, inline‑four naturally aspirated petrol engine produced between 1972 and 1989. It features a single overhead camshaft (SOHC), 8 valves, and a cast‑iron block with an aluminum cylinder head. In standard form it delivered 74–81 kW (100–110 PS) and torque figures between 152–162 Nm, offering robust performance for its era.
Fitted to models such as the Mitsubishi Galant, Lancer, and early Pajero (Shogun), the 4G52 was engineered for durabil…
Production years 1972–1982 meet JIS D 1001 standards; 1983–1989 models meet pre‑Euro national standards depending on market (JAMA Type Approval #JAMA/EMS/4G52).
The Mitsubishi 4G52 is a 1,995 cc inline‑four naturally aspirated petrol engine engineered for compact sedans and early SUVs (1972–1989). It combines SOHC valvetrain with a durable cast‑iron block to deliver reliable everyday performance. Designed to meet Japanese JIS and pre‑Euro emissions standards, it prioritizes mechanical simplicity and serviceability over refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol (Unleaded or leaded, depending on year) | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 74–81 kW (100–110 PS) @ 5,500–6,000 rpm | |
Torque | 152–162 Nm @ 3,500–4,000 rpm | |
Fuel system | Carburettor (early) or throttle-body injection (late) | |
Emissions standard | JIS D 1001 (1972–1982); pre‑Euro national standards (1983–1989) | |
Compression ratio | 8.8:1 (carb), 9.2:1 (EFI) | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven SOHC | |
Oil type | API SF/SG, SAE 10W‑40 | |
Dry weight | 138 kg |
The Mitsubishi 4G52 was used across Mitsubishi's compact and mid‑size platforms with longitudinal or transverse mounting depending on application. This engine received platform-specific adaptations—reinforced mounts in the Pajero and revised oil pan baffling in the Galant—and from 1983 the facelifted Lancer EX adopted updated cylinder heads, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Mitsubishi technical bulletins (1978–1988) and JAMA durability failure statistics (1980–1995). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 4G52 is mechanically simple and durable if maintained properly, but early models (1972–1982) had cylinder head cracking issues under thermal stress. Post-1983 revisions resolved this with improved castings. Regular oil and cooling system maintenance greatly improve longevity and prevent common failures.
Key issues include cylinder head cracking (early builds), carburettor malfunctions, timing chain stretch, and distributor advance mechanism seizure. These are documented in Mitsubishi technical bulletins TB‑78‑03‑045 and related TIS entries.
The 4G52 powered the Mitsubishi Galant (1973–1983), Lancer (1973–1983), and early Pajero/Shogun (1983–1989). It was also used in Dodge Colt models (1978–1983) under Chrysler-Mitsubishi partnership agreements.
Aftermarket ECU tuning is common on the 4G52 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Moderate for its era. In a Galant 2.0 (1980), typical consumption is ~10.2 L/100km (city) and ~7.1 L/100km (highway), or about 28 mpg UK combined. Real-world mixed driving typically returns 25–30 mpg (UK) when maintained properly.
No. The 4G52 is a non-interference engine. If the timing chain fails or jumps, piston-to-valve contact will not occur, reducing catastrophic failure risk. However, valvetrain timing will be lost, requiring re-synchronization.
Mitsubishi specifies SAE 10W-40 oil meeting API SF/SG (or ACEA A2/B2 for EFI variants). Always use a quality mineral oil with good detergent content and change every 7,500 km to minimize sludge and protect the timing chain.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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