HM12C Marine Engine

The HM12C Marine Engine is engineered to deliver reliable, high-output power for demanding marine propulsion applications. Featuring a six-cylinder, inline, water-cooled, four-stroke, direct-injection diesel configuration, the engine combines a robust design with turbocharged and intercooled intake technology to support efficient combustion and consistent performance in marine operating environments.

With an 11.596-litre displacement and rated power outputs of 265 kW, 295 kW, and 301 kW, the HM12C offers versatile performance options at rated speeds of 1,500, 1,800, and 2,000 rpm, respectively. Its four-valve-per-cylinder configuration, dry cylinder liners, and 17:1 compression ratio support efficient engine operation, while the electric starting system provides convenient and reliable starting.

Designed for dependable power delivery, the HM12C features a maximum power output of up to 331 kW, with specified fuel consumption ranging from 215 to 220 g/kWh across the three rated operating points. Additional features include an SAE No. 1 flywheel, a 28-litre oil pan capacity, and IMO Tier II emissions classification. Combining strong power output with a practical marine engine configuration, the HM12C is a suitable solution for vessels requiring reliable diesel propulsion.

Key Features

• Six-cylinder, inline diesel engine

• Water-cooled, four-stroke, direct-injection design

• Turbocharged and intercooled intake system

• Four valves per cylinder

• 11.596-litre total displacement

• Rated power options of 265 kW, 295 kW, and 301 kW

• Rated speeds of 1,500, 1,800, and 2,000 rpm

• Maximum power output of up to 331 kW

• Electric starting system

• Dry cylinder liners

• IMO Tier II emissions classification

• SAE No. 1 flywheel specification

Technical Specifications

• Engine model: HMD12C

• Engine series: HM12C

• Engine type: Marine diesel engine

• Intake type: Turbocharged and intercooled

• Number of cylinders: 6

• Bore × stroke: 126 × 155 mm

• Total displacement: 11.596 L

• Rated power: 265 kW / 295 kW / 301 kW

• Rated speed: 1,500 / 1,800 / 2,000 rpm

• Maximum power and corresponding speed: 291.5 kW at 1,545 rpm / 324.5 kW at 1,858 rpm / 331 kW at 2,060 rpm

• Firing order: 1-5-3-6-2-4

• Compression ratio: 17:1

• Valve configuration: 4 valves per cylinder

• Starting method: Electric start

• Idle speed: 630 ± 50 rpm

• Smoke intensity: ≤1.0 Rb

• Fuel consumption: 215 / 218 / 220 g/kWh

• Oil consumption: 0.5 g/kWh

• Oil pan capacity: 28 L

• Noise limit: 105 dB

• Emissions classification: IMO Tier II

• Flywheel specification: SAE No. 1

• Dimensions (L × W × H): 1,751 × 947 × 1,277 mm

• Net weight: 1,200 kg