1. Product Introduction
This Mitsubishi S12R-MPTA overhaul gasket kit (Part-2) is a complete sealing solution for full engine teardown and rebuild, covering all critical sealing interfaces: cylinder head joints, oil cooler seals, coolant passages, fuel system connections, crankcase covers, and nozzle mounting points. All components are direct-fit replacements engineered to match original Mitsubishi OEM part numbers and engine assembly schematics, requiring no on-site modification or trimming for installation.
2. Key Functional Specifications
- Sealing Performance: Zero-leak sealing for high-pressure oil galleries, coolant jackets, and combustion chamber interfaces, maintaining consistent engine pressure and fluid separation.
- Temperature Resistance: Operates reliably across -30℃ to 180℃, resisting hardening, cracking, and compression set under prolonged thermal cycling.
- Fluid Compatibility: Compatible with diesel engine lubricating oil, ethylene glycol coolant, and marine-grade diesel fuel, with zero material degradation.
- Fit & Precision: OEM-matched dimensions for perfect alignment with engine housing surfaces, eliminating gaps and uneven sealing pressure.
3. Structural & Quality Advantages
- JIS & OEM Compliance: All sealing components meet strict Japanese Industrial Standards and Mitsubishi original equipment specifications, with full material certification.
- Wear & Durability: High-density rubber compounds and reinforced gaskets offer a compression set ≤8% after 1000 hours of operation, extending service intervals.
- Corrosion Resistance: Sealing washers and metal-reinforced gaskets resist rust and oxidation, ideal for saltwater marine environments and humid industrial sites.
- Complete Kit Coverage: Includes all required sealing parts for Part-2 overhaul, eliminating the need for multiple part orders and reducing downtime.
4. Applicable Operating Conditions
This S12R-MPTA gasket kit is validated for use in the most demanding engine operating environments, performing reliably under these conditions:
- Engine Rating: 736KW (1000HP) at 1450 RPM, 2001 Mitsubishi S12R-MPTA V12 diesel engine
- Applications: Marine propulsion vessels, drilling rig generator sets, stationary industrial power units, and heavy-duty equipment drives
- Environmental Limits: Saltwater marine atmospheres, high-humidity industrial sites, ambient temperatures -30℃ to 50℃
- Service Modes: 24/7 continuous heavy-duty operation, intermittent load cycling, and full engine overhauls
6. Preventive Maintenance & Service Recommendations
Follow these field-proven maintenance steps to maximize seal life and prevent engine leaks:
- Pre-Installation Prep: Thoroughly clean all engine sealing surfaces to remove old gasket material, oil, and debris; ensure surfaces are flat and free of scratches.
- Torque Compliance: Tighten all fasteners to Mitsubishi OEM torque specifications in the recommended sequence to ensure even sealing pressure.
- 8000-Hour Inspection: Check for visible leaks at gaskets and O-rings; inspect sealing washers for corrosion or deformation.
- 15,000-Hour Service: Replace all nozzle gaskets and oil cooler packings; inspect large O-rings for hardening or cracks.
- 20,000-Hour Major Overhaul: Replace the entire sealing kit to prevent catastrophic leaks and restore engine sealing integrity.
We supply the following spare parts:
| Pos. | Part No. | Part Name | |
| 101 | 04829-70800 | GASKET | MITSUBISHI TYP S12R-MPTA |
| 102 | 04829-70650 | GASKET | MITSUBISHI TYP S12R-MPTA |
| 103 | 05507-00080 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 104 | 05507-10110 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 105 | 33336-10500 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 106 | 05507-20250 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 107 | 05946-00801 | WASHER,SEALING | MITSUBISHI TYP S12R-MPTA |
| 108 | 05946-01001 | WASHER,SEALING | MITSUBISHI TYP S12R-MPTA |
| 109 | 05946-01401 | WASHER,SEALING | MITSUBISHI TYP S12R-MPTA |
| 110 | 05946-01601 | WASHER,SEALING | MITSUBISHI TYP S12R-MPTA |
| 111 | 05946-02701 | WASHER,SEALING | MITSUBISHI TYP S12R-MPTA |
| 112 | 31275-74400 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 113 | 32546-36800 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 114 | 33442-10200 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 115 | 36236-00700 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 116 | 37463-21900 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 117 | 37536-07911 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 118 | 37546-13300 | PACKING, COVER | MITSUBISHI TYP S12R-MPTA |
| 119 | 37561-16800 | GASKET, NOZZLE | MITSUBISHI TYP S12R-MPTA |
| 120 | 37562-00816 | GASKET | MITSUBISHI TYP S12R-MPTA |
| 121 | 49162-51100 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 122 | 49181-22600 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 123 | 49181-22700 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 124 | 37735-11900 | GASKET | MITSUBISHI TYP S12R-MPTA |
| 125 | 37735-10900 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 126 | 37735-30700 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 127 | 37739-00200 | PACKING, OIL COOLER | MITSUBISHI TYP S12R-MPTA |
| 128 | 37739-12200 | PACKING, OIL COOLER | MITSUBISHI TYP S12R-MPTA |
| 129 | 37775-04200 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 130 | 48202-12400 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 131 | F3150-01400 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 132 | 05507-00220 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 133 | F3150-02600 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 134 | 05507-00420 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 135 | 05507-00440 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 136 | F3156-04500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 137 | F3153-06000 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 138 | F3153-06500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 139 | F3153-10500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 140 | 05507-21900 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 141 | F3153-17000 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 142 | F3156-29000 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 143 | F3150-03400 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 144 | F3156-03500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 145 | F3156-04000 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 146 | F3156-05000 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 147 | F3156-06500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 148 | F3156-07500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 149 | F3156-08500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 150 | F3156-14500 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 151 | F3156-16000 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 152 | F4202-14000 | GASKET | MITSUBISHI TYP S12R-MPTA |
| 153 | MF660040 | GASKET | MITSUBISHI TYP S12R-MPTA |
| 154 | MH035067 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 155 | 05507-00140 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 156 | MH035093 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 157 | 05507-10100 | O-RING | MITSUBISHI TYP S12R-MPTA |
| 158 | 37740-50315 | PACKING | MITSUBISHI TYP S12R-MPTA |
| 159 | 37594-01300 | BOND, 1211 | MITSUBISHI TYP S12R-MPTA |
| 160 | F3150-07000 | O-RIMG | MITSUBISHI TYP S12R-MPTA |
6. Field Failure Repair Cases (Real Engine Service Scenarios)
Case 1: Coolant Leak at Oil Cooler Housing
Issue: A Mitsubishi S12R-MPTA engine developed a persistent coolant leak at the oil cooler assembly, leading to low coolant levels and overheating risks.
Root Cause: Degraded oil cooler packing (37739-00200) failed to seal the coolant-oil interface, causing fluid cross-contamination and leakage.
Resolution: Installed genuine OEM replacement oil cooler packings, cleaned the sealing surfaces, and torqued mounting fasteners. Leakage was fully resolved, and normal engine temperature was restored.
Case 2: Oil Leak at Crankcase Cover
Issue: Severe engine oil leakage from the crankcase cover, resulting in low oil pressure and increased wear on internal components.
Root Cause: Worn cover packing (37546-13300) and degraded sealing washers lost compression, creating gaps between the cover and engine block.
Resolution: Replaced the cover packing and all associated sealing washers, re-seated the crankcase cover, and tightened fasteners to OEM specs. Oil leakage stopped completely, and oil pressure stabilized.
Case 3: Fuel Nozzle Leak & Performance Drop
Issue: Fuel leakage at the nozzle mounting points caused rough engine idle, reduced power output, and increased fuel consumption.
Root Cause: Brittle nozzle gaskets (37561-16800) failed to seal the fuel injection nozzles, leading to fuel seepage and combustion inefficiency.
Resolution: Replaced all 12 nozzle gaskets, re-installed the fuel nozzles, and tested engine performance. Fuel leakage was eliminated, and full 736KW power output was restored.
7. Frequently Asked Questions (FAQ)
| Question | Answer |
| Is this gasket kit a direct fit for the 2001 Mitsubishi S12R-MPTA 736KW engine? | Yes, every component matches OEM part numbers and dimensions, ensuring perfect fit for the 1450 RPM S12R-MPTA engine with no modifications needed. |
| Does this kit include all sealing parts for Part-2 engine overhaul? | Absolutely. This kit contains all gaskets, O-rings, packings, and sealing washers listed for Part-2 overhaul, covering every critical sealing interface. |
| Are these seals compatible with marine saltwater environments? | Yes, the materials are corrosion-resistant and oil/coolant compatible, making them ideal for marine propulsion and offshore drilling applications. |
8. Procurement Guidance & Call to Action
For operators and maintenance teams relying on the Mitsubishi S12R-MPTA 736KW engine, sourcing genuine, OEM-compliant sealing parts is critical to minimizing unplanned downtime, preventing costly fluid leaks, and extending engine service life. This overhaul gasket kit serves as a definitive procurement standard and technical reference, simplifying your sourcing process for full engine overhauls, leak repairs, and routine maintenance.
