The Mitsubishi S12R-Y1PTA-2 is a 49.03 L 12-cylinder turbo-charged, after cooler (jacket water to cooler) engine rated at 1800 rpm, producing up to 1403 kW. It powers generator sets from Kohler, including the 1250ROZMC. It holds 150 L (39.6 gal) of oil and 125 L (33.0 gal) of coolant.
Also known as: MITSUBISHI S12R-Y1PTA-2, S12R-Y1PTA-2
Part of the Mitsubishi S12R engine family — 21 variants share parts & fitment.
| Oil capacity | 150.0 L |
|---|---|
| Coolant capacity | 125.0 L |
| Displacement | 49.03 L |
| Cylinders | 12 |
| Aspiration | Turbo-Charged, After Cooler (Jacket water to Cooler) |
| Rated speed | 1800 rpm |
| Gross power | 1403 kW |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | 107.8 lit | — | |||
| Coolant filter | — | ||||
| Oil | 150.0 gal | — | |||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | 10 in. weld flange bolt circle diameter B | 361.95 | mm (14.25 in.) | |
| Other | 10 in. weld flange outside diameter C | 406.4 | mm (16.0 in.) | |
| Other | 10 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 12 in. weld flange bolt circle diameter B | 431.80 | mm (17.00 in.) | |
| Other | 12 in. weld flange outside diameter C | 482.6 | mm (19.0 in.) | |
| Other | 12 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 14 in. weld flange bolt circle diameter B | 476.25 | mm (18.75 in.) | |
| Other | 14 in. weld flange outside diameter C | 533.4 | mm (21.0 in.) | |
| Other | 14 in. weld flange quantity of bolts / bolt hole diameter D | 12, 28.58 | mm (1.13 in.) | |
| Other | 16 in. weld flange bolt circle diameter B | 539.75 | mm (21.25 in.) | |
| Other | 16 in. weld flange outside diameter C | 596.9 | mm (23.5 in.) | |
| Other | 16 in. weld flange quantity of bolts / bolt hole diameter D | 16, 28.58 | mm (1.13 in.) | |
| Other | 18 in. weld flange bolt circle diameter B | 577.85 | mm (22.75 in.) | |
| Other | 18 in. weld flange outside diameter C | 635.0 | mm (25.0 in.) | |
| Other | 18 in. weld flange quantity of bolts / bolt hole diameter D | 16, 31.75 | mm (1.25 in.) | |
| Other | 20 in. weld flange bolt circle diameter B | 635.00 | mm (25.00 in.) | |
| Other | 20 in. weld flange outside diameter C | 698.5 | mm (27.5 in.) | |
| Other | 20 in. weld flange quantity of bolts / bolt hole diameter D | 20, 31.75 | mm (1.25 in.) | |
| Other | 5 in. weld flange bolt circle diameter B | 215.90 | mm (8.50 in.) | |
| Other | 5 in. weld flange outside diameter C | 241.30 | mm (9.50 in.) | |
| Other | 5 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 6 in. weld flange bolt circle diameter B | 254.0 | mm (10.0 in.) | |
| Other | 6 in. weld flange outside diameter C | 279.4 | mm (11.0 in.) | |
| Other | 6 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 8 in. weld flange bolt circle diameter B | 298.45 | mm (11.75 in.) | |
| Other | 8 in. weld flange outside diameter C | 342.9 | mm (13.5 in.) | |
| Other | 8 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | Weld flange angle A (10, 12, 14 in. nominal pipe size) | 30 | deg. | |
| Other | Weld flange angle A (16, 18, 20 in. nominal pipe size) | 22.5 | deg. | |
| Other | Weld flange angle A (5, 6, 8 in. nominal pipe size) | 45 | deg. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 12-lead optional voltage connections | 12 | Alternator optional feature | ||
| 4-lead dedicated voltages | 4 | Alternator standard feature | ||
| 110/127/139/240/254/277 | single-phase | switchable | Towable generator model specifications; some models n/a | |
| 208/220/240/415/440/480 | 3-phase | reconnectable | Towable generator model specifications | |
| 208/220/240/415/440/480 | 3-phase | switchable | Towable generator model specifications |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| 30091-08800 | valve lapper | Air filter |
| FTG15L | Air Cleaner | Air filter |
| 8-16 | Cleaning, inspecting, and replacing the air cleaner element | Changing air cleaner element |
| 8-17 | Cleaning, inspecting, and replacing the air cleaner element | Changing air cleaner element |
| 8-10 | Changing the coolant | Changing coolant |
| 8-14 | Cleaning, inspecting and replacing pre-cleaner | Cleaning pre cleaner |
| 8-18 | Coolant drain cock - water pump | Coolant filter |
| 45483-61200 | Fuel filter | Fuel filter |
| GU-GST-1365 | VALVE GUIDE AND FUEL PUMP PULLER | Fuel pump |
| 37594-01300 | ThreeBond 1211 liquid gasket | Gasket |
| GU-53-YA-40 | GUIDE, VALVE TAPPET | Guide |
| 33591-10101 | nozzle remover | Injector |
| 45403-51100 | Oil cooler | Oil cooler |
| 36291-00098 | Oil sample bottle set | Oil filter |
| 36291-19100 | Engine oil sampling pump | Oil filter |
| 45193-50700 | Oil level gage | Oil level gage |
| 06.2019 | Radiator | Service part / kit |
| 32522-04111 | Thermo label for temperature management (75 to 95°C) | Service part / kit |
| 32522-04211 | Thermo label for temperature management (100 to 120°C) | Service part / kit |
| 32522-04311 | Thermo label for temperature management (50 to 70°C) | Service part / kit |
| 32591-04200 | valve seat puller | Service part / kit |
| 33591-04300 | valve guide remover | Service part / kit |
| 37191-03200 | piston ring tool | Service part / kit |
| 37507-12500 | Shim 0.10 ± 0.02 mm [0.0039 ± 0.0007 in.] for cylinder liner flange protrusion adjustment | Service part / kit |
| 37507-12510 | Shim 0.05 ± 0.02 mm [0.0020 ± 0.0007 in.] for cylinder liner flange protrusion adjustment | Service part / kit |
| 37507-12520 | Shim 0.15 ± 0.02 mm [0.0059 ± 0.0007 in.] for cylinder liner flange protrusion adjustment | Service part / kit |
| 37591-02400 | eye nut | Service part / kit |
| 37591-02600 | rocker bushing tool | Service part / kit |
| 37591-06200 | liner pusher | Service part / kit |
| 37591-06300 | bolts | Service part / kit |
| 37591-06400 | valve seat cutter | Service part / kit |
| 37591-06430 | valve seat cutter | Service part / kit |
| 37598-09100 | head bolt spacers | Service part / kit |
| 37598-09201 | projection plate O | Service part / kit |
| 43291-00301 | Plunger holder (special tool) | Service part / kit |
| 45191-08400 | Pliers | Service part / kit |
| 45483-51300 | Warning label | Service part / kit |
| 45493-50700 | Do not open inspection cover. | Service part / kit |
| 45493-51100 | Warning label | Service part / kit |
| 45493-51200 | INSPECTION COVER WITHIN 10 MINUTES AFTER ENGINE STOP. | Service part / kit |
| 45493-51300 | HIGH PLACE MAY CAUSE FALLING. | Service part / kit |
| 45493-51400 | Rotating parts can cause severe personal injury. | Service part / kit |
| 45493-51500 | BE CAREFUL OF ROTATING FAN. | Service part / kit |
| 48202-09301 | Sleeve installer | Service part / kit |
| 48202-14100 | Shim (thickness: 0.5 mm [0.0197 in.]) | Service part / kit |
| 48202-14200 | Shim (thickness: 0.6 mm [0.0236 in.]) | Service part / kit |
| 48291-00200 | Plunger spring compression jig | Service part / kit |
| 48291-00301 | Plunger holder | Service part / kit |
| 48291-00400 | Cam thrust ejector | Service part / kit |
| 49160-90101 | snap ring pliers | Service part / kit |
| 49160-90110 | snap ring pliers | Service part / kit |
| 99240-32120 | Pub.No. 99240-32120 | Service part / kit |
| GU-14-Y | VALV - GU-14-Y | Service part / kit |
| GU-14-Y-117 | BODY - GU-14-Y-117 | Service part / kit |
| GU-14-Y-117B | NUT, LOCK - GU-14-Y-117B | Service part / kit |
| GU-14-Y-117C | DE - Y-117C | Service part / kit |
| GU-14-Y-117D | REGULATOR, FUEL PRESSURE - GU-52-YA-117A | Service part / kit |
| GU-14-Y-117E | SCREW, ADJUSTING - GU-14-Y-117E | Service part / kit |
| GU-14-Y-117G | SPRING - GU-14-Y-117G | Service part / kit |
| MM321420 | 7: | pout. eve W11 1 1 1 a | Service part / kit |
| GU-52-Y-94 | PLATE, DECOMPRESSION | Plate |
| 48291-00100 | Pump assembly stand | Pump |
| 37191-01500 | valve guide seal installer | Seal |
| 48202-14300 | tappet | Tappet |
| 48202-14400 | tappet | Tappet |
| GU-52-Y-121 | TAPPET, VALVE | Tappet |
| 32522-04100 | Thermo Label 75°C to 95°C (167°F to 203°F) | Thermostat |
| 32522-04200 | Thermo Label 100°C to 120°C (212°F to 248°F) | Thermostat |
| 32522-04300 | Thermo label (50 to 70 °C) | Thermostat |
| 45493-51800 | Turning gear position (turning shaft) | Turning gear position |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
The Mitsubishi S12R-Y1PTA-2 engine has an oil capacity of 150.0 liters.
The Mitsubishi S12R-Y1PTA-2 has a displacement of 49.03 liters with 12 cylinders.
The Mitsubishi S12R-Y1PTA-2 powers 1 generator set(s), including Kohler 1250ROZMC.