The Mitsubishi 4G32 is a 1,597 cc, inline‑four naturally aspirated petrol engine produced between 1971 and 1989. It features a single overhead camshaft (SOHC), 8 valves, and a carbureted fuel system throughout its production run. In standard form it delivered 55–77 kW (75–105 PS) and 118–137 Nm of torque, emphasizing mechanical simplicity and global serviceability.
Fitted to models such as the Galant, Lancer, and Colt, the 4G32 was engineered for cost‑effective owner…
Production years 1971–1988 meet pre‑Euro standards; 1989 models may meet Euro 1 depending on market .
The Mitsubishi 4G32 is a 1,597 cc inline‑four naturally aspirated petrol engine engineered for compact sedans and coupes (1971–1989). It combines a durable cast‑iron block with SOHC valvetrain and carbureted induction 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 | 1,597 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 80.0 mm × 79.5 mm | |
Power output | 55–77 kW (75–105 PS) @ 5,500–6,000 rpm | |
Torque | 118–137 Nm @ 3,500–4,000 rpm | |
Fuel system | Single or twin-barrel carburetor | |
Emissions standard | Pre‑Euro (1971–1988); Euro 1 (1989, market-dependent) | |
Compression ratio | 8.8:1 – 9.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft (maintenance‑free design) | |
Oil type | API SF/CC (SAE 10W‑40 mineral) | |
Dry weight | 118 kg |
The Mitsubishi 4G32 was used across Mitsubishi's Galant, Lancer, and Colt platforms with transverse or longitudinal mounting depending on model. This engine received platform-specific adaptations—revised engine mounts in the Galant Sigma and modified air cleaner boxes in the Lancer EX—and from 1983 the updated camshaft metallurgy improved valvetrain durability, creating minor interchange limits for cam and lifter components. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
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 manufacturer technical service bulletins and industry workshop records. 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 4G32 is mechanically robust with proper maintenance. Early models (1971–1982) had camshaft lobe wear issues, but post-1983 revisions improved durability. Its SOHC design and lack of complex electronics make it easier to service than modern engines. Regular oil changes and use of correct 10W-40 oil are essential for longevity.
Top issues include camshaft lobe wear (pre-1983), carburetor flooding due to ethanol fuel, timing chain stretch from age, and valve cover oil leaks. These are documented in Mitsubishi TSB-ME-79-004 and field service records. Most are preventable with routine maintenance and fuel system care.
The 4G32 powered the Galant (1971–1980), Lancer (1973–1979), Colt (1978–1984), and Galant Sigma (1976–1983) in 1.6L variants. Applications include both transverse and longitudinal layouts in sedans, coupes, and wagons. It was replaced by the 4G12 in most markets after 1984.
Limited tuning via carburetor jetting or mild camshaft upgrade (+5–10 kW) is possible, but internal components are not designed for high output. Adding a free-flow exhaust and cold-air intake can support modest gains. However, most owners prioritize reliability; aggressive tuning increases valvetrain wear risks.
Efficient for its era. In a Galant 1.6 GL, expect ~8.5 L/100km (city) and ~6.3 L/100km (highway), or ~33 mpg UK combined. Real-world mixed driving typically returns 28–36 mpg (UK), depending on condition and driving style. Twin-carburetor GSR variants are less efficient.
No. The 4G32 is a non-interference engine due to generous piston-to-valve clearance in its SOHC design. If the timing chain were to fail (rare due to robust construction), valve and piston contact would not occur, preventing catastrophic damage.
Mitsubishi specifies API SF/CC mineral oil, typically SAE 10W-40. Synthetic oils are not recommended for the flat-tappet camshaft design. Change every 10,000 km or 6 months to protect cam lobes and lifters.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.