Engines · R series
S12R V12
Propulsion / Diesel-Electric / Genset
- Applications
- Propulsion / Diesel-Electric Propulsion / Auxiliary Genset
- Output
- 588–1342 kW
- Output
- 789–1800 bhp
- Displacement
- 49.03 L
- Cylinders
- 12
- Configuration
- V12
- Bore × stroke
- 170 × 180 mm
- Dry weight
- 5,500 kg
- Dimensions (L×W×H)
- 2556.5 × 1622 × 1727.5 mm
- EIAPP
- IMO II Compliant
- Class approvals
- NK, LR, BV, ABS, DNV, BKI, VR
Twelve-cylinder, 60° V-configuration diesel with direct injection and
turbocharging. The S12R covers the widest output band in the MHI marine
high-speed range, spanning propulsion, diesel-electric propulsion and
auxiliary genset duty from a shared core architecture.
Full ratings by duty
Propulsion588–1342 kW · 1400–1800 rpm
VariantkWbhprpmRatingCoolingEmissions
S12R-MPTAWNot sold new →5887891400UCDIntercooler, fresh waterIMO Tier II S12R-MPTAWNot sold new →6969331500UCDIntercooler, fresh waterIMO Tier II S12R-MPTAWNot sold new →74910041500UCDIntercooler, fresh waterIMO Tier II S12R-MPTAWNot sold new →74910041600UCDIntercooler, fresh waterIMO Tier II S12R-MPTAWNot sold new →94012611600UCDIntercooler, fresh waterIMO Tier II S12R-MPTAWNot sold new →104013951650HDIntercooler, fresh waterIMO Tier II S12R-T2MPTK94012611600UCDIntercooler, sea waterIMO Tier II
S12R-T2MPTK104013951650HDIntercooler, sea waterIMO Tier II
S12R-T2MPTK121016231800MDIntercooler, sea waterIMO Tier II
S12R-T2MPTK2120216121650HDIntercooler, sea waterIMO Tier II
S12R-T2MPTK2134218001800MDIntercooler, sea waterIMO Tier II
Not sold new configurations don't meet IMO Tier II, which Australian rules require for new marine engines sold here. OPS still stocks genuine parts for them and can supply the Tier II equivalent.
Diesel-Electric Propulsion840–1154 kW · 1200–1800 rpm
VariantkWbhprpmHzCoolingEmissions
S12R-MPTAWNot sold new →8401126120060Intercooler, fresh waterIMO Tier II (SCR25) S12R-MPTAWNot sold new →11201502150050Intercooler, fresh waterIMO Tier II (SCR36) S12R-MPTAWNot sold new →11541548180060Intercooler, fresh waterIMO Tier II (SCR36) Not sold new configurations don't meet IMO Tier II, which Australian rules require for new marine engines sold here. OPS still stocks genuine parts for them and can supply the Tier II equivalent.
Auxiliary Genset840–1270 kW · 1200–1800 rpm
VariantkWbhprpmHzCoolingEmissions
S12R-MPTAWNot sold new →8401126120060Intercooler, fresh waterIMO Tier II (SCR25) S12R-MPTAWNot sold new →11201502150050Intercooler, fresh waterIMO Tier II (SCR36) S12R-MPTAWNot sold new →12701703180060Intercooler, fresh waterIMO Tier II (SCR36) Not sold new configurations don't meet IMO Tier II, which Australian rules require for new marine engines sold here. OPS still stocks genuine parts for them and can supply the Tier II equivalent.
Rating codes
- UCDUnrestricted Continuous Duty
- Full-load operation allowed unlimited, unlimited hours per year. Cargo vessels and fishing boats.
- HDHeavy Duty
- Up to 83% load, full load for 8 hrs per 24 hrs, under 6,000 hrs/year. Working, fishing, tug and ferry boats, passenger vessels.
- MDMedium Duty
- Up to 75% load, full load for 1 hr per 6 hrs, under 4,000 hrs/year. Pleasure and patrol boats, high-performance vessels.
Injectors, turbocharger cartridges and water pump kits are held in Wangara. Genset-specific alternator parts are sourced through MHI on indent.
Parts for the S12R
Genuine MHI parts stocked in Wangara WA, with a regional supply hub in Singapore.
Pair the S12R with Smart Cruising Assist for real-time engine monitoring, fuel tracking and maintenance alerts.
Figures on this page are indicative and subject to change without notice — confirm the exact rating and configuration with OPS before specifying.
