This workshop service repair manual covers the Hyundai/Mitsubishi 4G63-32HL, 4G64-33H, 4G63, and 4G64 internal combustion engines, specifically designed for the repair and maintenance of Hyundai forklifts including models HLF 15-5, HLF 18-5, HLF 20-5, HLF 25-5, and HLF 30-5. These 4-cylinder gasoline engines are engineered for robust performance and reliability in demanding industrial applications. This manual provides essential information to ensure these engines operate at their peak efficiency and longevity. The purpose of this manual is to provide comprehensive information for performing correct procedures and preventive maintenance on the specified Hyundai/Mitsubishi engines. It details routine and preventive maintenance practices aimed at preventing premature failure and unnecessary repairs. Key areas covered include general information, service specifications, tightening torques, sealant application, special tools, engine adjustments, ignition system, timing belt, intake and exhaust manifolds, water pump, cylinder head and valves, crankshaft and block assembly, starter and alternator motors, distributor, and troubleshooting. This resource is invaluable for owners, mechanics, and technicians seeking to maintain and repair these engines effectively.