The Mitsubishi S12R-Y2PTAW is an engine. It powers generator sets from AKSA, including the APD-ULM1250.
Also known as: Mitsubishi S12R-Y2PTAW
Part of the Mitsubishi S12R engine family — 14 variants share parts & fitment.
| Code | Meaning |
|---|---|
| B17 | Pre-cleaner |
| Symptom | Cause | Remedy |
|---|---|---|
| The starter does not crank or cranks slowly, resulting in start failure | ' Blown fuse Faulty wiring connection between battery and starter switch Faulty wiring connection between battery, starter and starter switch, Electrical system * Insufficiently charged battery Specific gravity of battery fluid too low Faulty battery Faulty starter or starter relay | ' Change fuse Connect wire correctly Connect wire correctly Inspect and adjust V-belt tension. Refer to "Inspecting V-belt and adjusting belt tension" (8-3). Charge battery Install new battery Consult a Mitsubishi dealer Use appropriate engine oil. Refer to "ENGINE OIL" (5-1). Bleed fuel system. Refer to "Bleeding the fuel system" (3-2). Add fuel Change fuel filters. ° Refer to "Changing the fuel filter” (8-6). Consult a Mitsubishi dealer |
| The starter cranks, but the engine does not start | ' Empty fuel tank Damaged fuel pipe Loose fuel pipe connection Improper fuel Dust or water mixed in fuel Clogged fuel filters Faulty fuel feed pump Faulty fuel injection pump Air intake system Clogged air cleaner or pre-cleaner - Compression pressure low (damaged cylinder liner, piston or piston ring, or faulty valve seat or nozzle packing seal) | ' Add fuel, and bleed fuel system. Refer to "FUEL" (4-1). Consult a Mitsubishi dealer Tighten connection. Consult a Mitsubishi dealer Use proper fuel. Refer to "FUEL" (4-1). Remove dust or water from fuel tank. Refer to "Draining water from the fuel tank" (8-5). Replace fuel filters. Refer to "Changing the fuel filter" (8-6). Consult a Mitsubishi dealer Clean air cleaner or pre-cleaner . Refer to "Cleaning, inspecting and replacing pre-cleaner” (8-16). Engine mechanical Consult a Mitsubishi dealer |
| Engine output is low | ' Engine oil viscosity too high Improper fuel Insufficient air intake (clogged air cleaner) Engine overcooling Clogged fuel filter Faulty fuel feed pump Faulty fuel injection pump Faulty fuel injection nozzles Incorrect fuel injection timing Low compression pressure ~ (worn cylinder liners, worn piston rings, etc.) | ' Use engine oil of appropriate viscosity according to ambient temperature. Refer to "ENGINE OIL" (5-1). Use proper fuel. Refer to "FUEL" (4-1). Clean air cleaner element, or replace if necessary. Refer to Cleaning, inspecting, and replacing the air cleaner element |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
| Part # | Description | Category |
|---|---|---|
| S12R-PTA | engine | |
| S12R-PTA2 | engine | |
| S12R-PTAA2 | engine | |
| 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 |
| 06.2019 | Radiator | other_service |
| 30091-08800 | valve lapper | other_service |
| 32591-04200 | valve seat puller | other_service |
| 33591-04300 | valve guide remover | other_service |
| 37191-03200 | piston ring tool | other_service |
| 37591-02400 | eye nut | other_service |
| 37591-02600 | rocker bushing tool | other_service |
| 37591-06200 | liner pusher | other_service |
| 37591-06300 | bolts | other_service |
| 37591-06400 | valve seat cutter | other_service |
| 37591-06430 | valve seat cutter | other_service |
| 37598-09100 | head bolt spacers | other_service |
| 37598-09201 | projection plate O | other_service |
| 43291-00301 | Plunger holder (special tool) | other_service |
| 45191-08400 | ring pliers | other_service |
| 48202-09301 | Sleeve installer | other_service |
| 48202-14100 | Shim (thickness: 0.5 mm [0.0197 in.]) | other_service |
| 48202-14200 | Shim (thickness: 0.6 mm [0.0236 in.]) | other_service |
| 48291-00200 | Plunger spring compression jig | other_service |
| 48291-00301 | Plunger holder | other_service |
| 48291-00400 | Cam thrust ejector | other_service |
| 49160-90101 | snap ring pliers | other_service |
| 49160-90110 | snap ring pliers | other_service |
| GU-14-Y | VALV - GU-14-Y | other_service |
| GU-14-Y-117 | BODY - GU-14-Y-117 | other_service |
| GU-14-Y-117B | NUT, LOCK - GU-14-Y-117B | other_service |
| GU-14-Y-117C | DE - Y-117C | other_service |
| GU-14-Y-117D | REGULATOR, FUEL PRESSURE - GU-52-YA-117A | other_service |
| GU-14-Y-117E | SCREW, ADJUSTING - GU-14-Y-117E | other_service |
| GU-14-Y-117G | SPRING - GU-14-Y-117G | other_service |
| MM321420 | piston remover | other_service |
| SCR25 | Mitsubishi SCR system | other_service |
| GU-52-Y-94 | PLATE, DECOMPRESSION | plate |
| 48291-00100 | Pump assembly stand | pump |
| 37191-01500 | valve guide seal installer | seal |
| 37507-12500 | shim, thickness: 0.10 mm [0.0039 in.] | shim |
| 37507-12510 | shim, thickness: 0.05 mm [0.0020 in.] | shim |
| 37507-12520 | shim, thickness: 0.15 mm [0.0059 in.] | shim |
| 48202-14300 | tappet | tappet |
| 48202-14400 | tappet | tappet |
| GU-52-Y-121 | TAPPET, VALVE | tappet |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Mitsubishi S12R-Y2PTAW powers 1 generator set(s), including AKSA APD-ULM1250.