Name: Mitsubishi S12R
Brand: Mitsubishi
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Mitsubishi Diesel Engine S12R

OPERATION & MAINTENANCE MANUAL

Issued in December 2023

Pub. No. 291Y1-40720 Revision: 5

Issued by Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

3000, Tana, Chuo-ku, Sagamihara, Kanagawa, 252-5293, Japan

Edited by MHI Sagami High-tech LTD.

Printed and bound by Fuji Film Service Link Co., Ltd.

• The manual with incorrect collating or missing pages is to be replaced.

• Without written approval from the publisher, for all or some part of this manual, unauthorized reproduction,

copy, reprinting in any way or method are prohibited.

表紙

Foreword3
- General4
- Important Information4
- Intended Purpose and Use4
- General5
- Important Tips for Safety of Work5
- To the User Company5
- About this Manual6
- Fig6
- Fig. 2 Attaching Location of Emission Control Fig6
- Important Tips for Managing Safety of Work6
- Warranty Provisions7
- Emission Warranty8
- Fig8
- Fig. 1-12 Measures in the Event of Fig8
- Contact List10
- Approved Label11
- Emission Control Approved Label11
- Fig. 1 Location of Nameplate11
- Model Name11
- Main Specifications12
- Specifications - Check12
- Table 1 Main Specifications12
- Detailed Specifications13
- Specifications of Engine Body13
- Additional Equipment of Generator14
- Protection Devices Added During Manufacturing the Generator15
- Definition of Intended Persons16
- Fig. 1 Structure of Service Documents17
- Structure of Service Documents17
- Table of Contents18
- Structure of this Manual18
  - List of Models19
  - Warning/Caution Labels29
- Abbreviations and Standards20
- Unit of Measurement20
- General Information28
- Safety28
- Types and Meanings of Warning Terms28
- Warnings28
Engine - Outline75
- Names of Parts75
- S12R-Y1Pta, S12R-Y1Pta-2, S12R-Y1Pta-3, S12R-Y1Pta-476
- S12R-Y1Pta2-1, S12R-Y1Pta2-278
- S12R-Y2Ptaw, S12R-Y2Ptaw-180
- Protection System - Location82
- S12R-Y1Pta, S12R-Y1Pta-2, S12R-Y1Pta-3, S12R-Y1Pta-483
- S12R-Y1Pta2-1, S12R-Y1Pta2-284
- S12R-Y2Ptaw, S12R-Y2Ptaw-185
- Starting and Stopping Devices Installed During Manufacturing the Generator86
Operation87
- Operation - Outline87
- Air Direct Admission Starting - Check94
- Fig. 3-2 Manual Turning Gear - Check94
- Manual Turning Gear - Check94
- Air Motor Starting - Check95
- Air Direct Admission Starting96
- Engine Start-Up96
- Self Starter Motor Starting96
- Air Motor Starting97
- Fig. 3-3 Air Motor Muffler97
- Warm-Up Operation98
- Operation99
- Checking During Operation100
- Cooling Operation101
Fuel103
- (Emission Control Approved Model)103
- Diesel Fuel103
- Diesel Fuel104
- Fig. 4-1 ULSD Label104
- Table 4-1 Fuel Properties Table (Emission Control Approved Model)104
- Table 4-2 Fuel Properties Limit Table104
- Table 4-3 Fuel Specifications104
- Fuel - Handling105
- Fuel - Refill105
- Fuel Quality Standard106
Table 4-4 Fuel Properties Table (1/2)106
Table 4-5 Fuel Properties Table (2/2)107
Engine Oil109
- Engine Oil Grade109
- Fig. 5-1 MITSUBISHI DIESEL ENGINE OIL109
- Engine Oil Viscosity110
- Handling Engine Oil110
- Viscosity110
Coolant111
- Table 6-1 Water Quality Standard111
- Water to be Used111
- Coolant (LLC) - Handling112
- LLC to be Used112
- Coolant - MIX113
- LLC Concentration (Genuine LLC)113
- LLC Concentration in Coolant - Check113
- Maintenance of LLC113
- Replacement Period113
Table 6-3 Scale Conversion Table116
Scheduled Maintenance117
- How to Use the Scheduled Maintenance117
- Category of Scheduled Maintenance Chart118
- Rating Definition119
- Table 7-1 MHIET Generator Use Diesel Engine Rating Definition (1/2)119
- Table 7-2 MHIET Generator Use Diesel Engine Rating Definition (2/2)120
- Scheduled Maintenance for EPA Compliant Generator Use Diesel Engine121
Table 7-3 Maintenance Schedule (1/2)121
Table 7-4 Maintenance Schedule (2/2)122
Inspection and Maintenance123
- Inspection and Maintenance - General Information123
- Belt Cover - Remove128
- Belt Tension (Alternator) - Adjust128
- Belt Tension - Adjust (Lock Nut)128
- Belt Tension - Adjust (Retaining Bolt)128
- Belt Tension - Adjust (Turn Buckle)128
- Belt Cover - Install129
- Belt Tension - Adjust (Lock Nut)129
- Belt Tension - Adjust (Retaining Bolt)129
- Front Cover - Install129
Long-Term Storage171
10 Transportation175
11 Troubleshooting178
Table 11-1 Starter Does Not Crank or Cranks Slowly, Resulting in Starting Failure180
Table 11-2 Starter Cranks, but Engine Does Not Start181
Table 11-3 Output Shortage (1/2)182
Table 11-4 Output Shortage (2/2)183
Table 11-5 Exhaust Smoke Is White or Blue184
Table 11-6 Exhaust Smoke Is Black or Dark Grey185
Table 11-7 Exhaust Smoke Is Black or Dark Grey (2/2)186
Table 11-8 Excessive Fuel Consumption187
Table 11-9 Excessive Engine Oil Consumption188
Table 11-10 Overheating189
Table 11-11 Engine Oil Pressure Drop190
Table 11-12 Engine Stops191
Table 11-13 During Normal Operation, Thermo Switch Activated192
13 Disposal194
Table 14-1 Engine Oil Quality Standards (Grade CF SAE 30)198
Table 14-2 Engine Oil Quality Standards (Grade CF SAE 15W-40)199
Table 14-3 Engine Oil Quality Standards (Grade CH-4 SAE 15W-40)200
Table 14-4 Engine Oil Properties202
Table 14-5 Engine Oil Service Limits for Emergency Use203
Table 14-6 LLC Specifications (1/3)205
Table 14-7 LLC Specifications (2/3)206
Table 14-8 LLC Specifications (3/3)207

Engine Model	S12R
Fuel Type	Diesel
Starting System	Electric starter
Aspiration	Turbocharged
Lubrication System	Forced lubrication
Cooling System	Water-cooled

Mitsubishi S12R Service Manual

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Mitsubishi S12R Specifications

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