HomeEnginesMitsubishi S12R-Y2PTAW

Mitsubishi S12R-Y2PTAW Engine Engine

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.

Engine specifications

Generator sets powered by this engine

1

Troubleshooting

4

Fault codes

CodeMeaning
B17Pre-cleaner

Symptoms & remedies

SymptomCauseRemedy
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.

Parts cataloged across the Mitsubishi S12R family

48
Part #DescriptionCategory
S12R-PTAengine
S12R-PTA2engine
S12R-PTAA2engine
GU-GST-1365VALVE GUIDE AND FUEL PUMP PULLERfuel_pump
37594-01300ThreeBond 1211 liquid gasketgasket
GU-53-YA-40GUIDE, VALVE TAPPETguide
33591-10101nozzle removerinjector
06.2019Radiatorother_service
30091-08800valve lapperother_service
32591-04200valve seat pullerother_service
33591-04300valve guide removerother_service
37191-03200piston ring toolother_service
37591-02400eye nutother_service
37591-02600rocker bushing toolother_service
37591-06200liner pusherother_service
37591-06300boltsother_service
37591-06400valve seat cutterother_service
37591-06430valve seat cutterother_service
37598-09100head bolt spacersother_service
37598-09201projection plate Oother_service
43291-00301Plunger holder (special tool)other_service
45191-08400ring pliersother_service
48202-09301Sleeve installerother_service
48202-14100Shim (thickness: 0.5 mm [0.0197 in.])other_service
48202-14200Shim (thickness: 0.6 mm [0.0236 in.])other_service
48291-00200Plunger spring compression jigother_service
48291-00301Plunger holderother_service
48291-00400Cam thrust ejectorother_service
49160-90101snap ring pliersother_service
49160-90110snap ring pliersother_service
GU-14-YVALV - GU-14-Yother_service
GU-14-Y-117BODY - GU-14-Y-117other_service
GU-14-Y-117BNUT, LOCK - GU-14-Y-117Bother_service
GU-14-Y-117CDE - Y-117Cother_service
GU-14-Y-117DREGULATOR, FUEL PRESSURE - GU-52-YA-117Aother_service
GU-14-Y-117ESCREW, ADJUSTING - GU-14-Y-117Eother_service
GU-14-Y-117GSPRING - GU-14-Y-117Gother_service
MM321420piston removerother_service
SCR25Mitsubishi SCR systemother_service
GU-52-Y-94PLATE, DECOMPRESSIONplate
48291-00100Pump assembly standpump
37191-01500valve guide seal installerseal
37507-12500shim, thickness: 0.10 mm [0.0039 in.]shim
37507-12510shim, thickness: 0.05 mm [0.0020 in.]shim
37507-12520shim, thickness: 0.15 mm [0.0059 in.]shim
48202-14300tappettappet
48202-14400tappettappet
GU-52-Y-121TAPPET, VALVEtappet

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

Which generators use the Mitsubishi S12R-Y2PTAW engine?

The Mitsubishi S12R-Y2PTAW powers 1 generator set(s), including AKSA APD-ULM1250.