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Home›Engines›Mitsubishi S16R-Y1PTAA2-3

Mitsubishi S16R-Y1PTAA2-3 Engine

The Mitsubishi S16R-Y1PTAA2-3 is a 65.4 L 16-cylinder turbocharged engine rated at 1500 rpm, producing up to 1939 kW. It powers generator sets from Kohler and Mitsubishi, including the 2000REOZM and S16R-Y1PTAA2. It holds 170 L (44.9 gal) of coolant.

Also known as: MHI S16R-Y1PTAA2-3

Part of the Mitsubishi S16R engine family — 26 variants share parts & fitment.

65.4 L
Displacement
16
Cylinders
1500 rpm
Rated speed
1939 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQTorque & specsProcedures

Engine specifications

Coolant capacity170.0 L
Displacement65.4 L
Cylinders16
AspirationTurbocharged
Rated speed1500 rpm
Gross power1939 kW

Generator sets powered by this engine

2

Shared across brands: Kohler, Mitsubishi

Kohler 2000REOZMMitsubishi S16R-Y1PTAA2

How to read your Mitsubishi engine serial & model number →

Common problems

6
  • Emergency Stop 32A
    Fix: Reset the emergency stop switch.
  • Pre Low Oil Pressure 41
    Fix: Check and adjust oil level or replace oil pump.
  • Pre High Coolant Temp. 40
  • Low Fuel 63
    Fix: Refuel the generator set.
  • Low Battery Volts 62
  • High Coolant Temperature 32

Compiled from service & troubleshooting documentation across every generator set that uses the Mitsubishi S16R-Y1PTAA2-3.

Maintenance schedule

ItemSpecCapacityPart #Interval
Fuel filtersecondary—
Oil filterCartridgeGM38852 Amazon eBay $53.27 NAPA $37.54
OilFull pressure560.0 Lph—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service specifications

20
TypeItemValueUnitCondition
GapSpeed sensor air gap0.36- 0.71mm
PressureBattery equalizer input voltage (24 volts nominal)20- 35volts
PressureBattery equalizer output voltage(input voltage/2) ±2%volts
PressurePressure switch 364345483 ±14kPa
ResistancePressure sender 264390 value A240 +17/- 15ohms at 0 psi
ResistancePressure sender 264390 value B153 +12/- 15ohms at 25 psi
ResistancePressure sender 264390 value C33.5ohms at 100 psi
ResistancePressure sender 365624 value A241 ±16ohms at 0 psi
ResistancePressure sender 365624 value B152 ±13ohms at 50 psi
ResistancePressure sender 365624 value C33.5ohms at 200 psi
ResistanceTemperature sender 226717 value A123.8 +7.2/- 7.8ohms at 90.6 C (195 F)
ResistanceTemperature sender 226717 value B35.6 +3.4/- 3.6ohms at 137.8 C (280 F)
ResistanceTemperature sender 226919 value A942 ±22ohms at 37.7 C (100 F)
ResistanceTemperature sender 226919 value B35ohms at 115.6 C (240 F)
SpeedOverspeed shutdown70Hz60 Hz models
TemperatureBattery equalizer operating temperature- 40 to 71C (- 40 F to 160 F)
TemperatureTemperature switch 241308107 ±4C (225 F ±7 F)normally open to close on temp. rise
TemperatureTemperature switch 290090/GM5170516 ±3C (60 F ±5 F)normally open to close on temp. fall
VoltageSpeed sensor voltage, wire 2 (black) & 16 (white)3- 6volts DC
VoltageSpeed sensor voltage, wire 2 (black) & 24 (red)8- 10volts DC

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

12
Overfrequency Adjustment (Over/Underfrequency Relay, Decision-Maker 3+) adjustment
  1. Turn the overfrequency adjustment potentiometer fully clockwise (CW).
  2. Place master switch in RUN to start the generator set.
  3. Adjust governor per engine operation manual, engine service manual, or governor section of this manual.
  4. Slowly turn overfrequency potentiometer counterclockwise (CCW) until the LED starts flashing; after about 10 seconds the set shuts down on auxiliary fault.
  5. Place master switch to OFF/RESET to reset the controller.
  6. Place master switch to RUN to start the generator set.
  7. Readjust the governor to the desired frequency as required.
  8. Place master switch to OFF/RESET to stop the generator set.
Overvoltage Feature Testing and Adjustment (Decision-Maker 3+) adjustment

⚠ Hazardous voltage. Moving parts. Will cause severe injury or death. Operate the generator set only when all guards and electrical enclosures are in place.

⚠ Disconnecting the electrical load. Hazardous voltage will cause severe injury or death.

  1. Disconnect generator set from load by opening line circuit breaker or disconnecting and taping output leads.
  2. Determine overvoltage shutdown value based on user requirement; factory setting is 15% above nominal line-to-neutral voltage.
  3. Remove the controller cover.
  4. Place master switch in RUN to start the generator set.
  5. Observe AC voltmeter; turn voltage adjustment potentiometer CW until generator set shuts down.
  6. If the shutdown point is correct, go to step 12; otherwise continue.
  7. Turn controller circuit board R42 adjustment potentiometer fully CW.
  8. Place master switch to OFF/RESET to reset; then to RUN to start.
  9. Observe AC voltmeter while turning voltage adjustment potentiometer to desired overvoltage shutdown point.
  10. Turn R42 adjustment potentiometer slowly CCW until the generator set shuts down.
  11. Turn controller voltage adjustment potentiometer slightly CCW.
  12. Place master switch OFF/RESET then RUN to start; adjust for correct voltage and phase.
  13. Place master switch OFF/RESET to stop.
  14. Disconnect battery negative lead first; reconnect generator set to load; reconnect battery negative lead last.
Reactive Droop Compensator Adjustment Procedure adjustment

Tools: Voltmeter, Wattmeter

  1. Remove any load; start each generator set with master switch in RUN.
  2. Set reactive droop compensator rheostat on generator set no. 1 to minimum CCW; record rpm/frequency and voltage at 1/4 load steps to full load.
  3. Repeat for generator set no. 2.
  4. Compare readings; adjust voltage within 1 volt and speed within 3 rpm (or 0.1 Hz) at each load step.
  5. Check droop compensation on each unit with an inductive load 1/2 to full load.
  6. Adjust rheostat to approximately 4% below rated voltage at full load.
  7. Repeat for unit no. 2.
Reactive Droop Compensator Alternate Adjustment Procedure adjustment

Tools: Voltmeter

  1. Turn reactive droop compensator rheostat on generator set no. 1 to minimum setting.
  2. Remove controller cover; move voltage sensing lead from V7 to V9 at the AC fuse terminal block.
  3. Remove any load connected to the generator set.
  4. Start the generator set with master switch in RUN.
  5. Use controller or remote voltage adjusting potentiometer to fine adjust voltage.
  6. Apply resistive load (1.0 power factor) until reaching rated current.
  7. Adjust reactive droop compensator rheostat to achieve a 4% droop in voltage.
  8. Remove the resistive load and stop the generator set.
  9. Return voltage sensing lead from V9 to V7 at the AC fuse terminal block.
  10. Replace the controller cover and repeat for generator set no. 2.
Underfrequency Adjustment (Over/Underfrequency Relay, Decision-Maker 3+) adjustment
  1. Turn underfrequency adjustment potentiometer fully clockwise (CW).
  2. Place master switch in RUN to start the generator set.
  3. Adjust governor per engine operation manual, engine service manual, or governor section of this manual.
  4. Slowly turn underfrequency potentiometer counterclockwise (CCW) until LED starts flashing; after about 10 seconds the set shuts down on auxiliary fault.
  5. Place master switch to OFF/RESET to reset the controller.
  6. Place master switch to RUN to start the generator set.
  7. Readjust the governor to the desired frequency as required.
  8. Place master switch to OFF/RESET to stop the generator set.
2-Wire Low Water Level Sender Test diagnostic

⚠ Hot engine and exhaust system can cause severe injury or death. Do not work on the generator set until it cools.

⚠ Hazardous voltage. Moving parts. Will cause severe injury or death. Operate the generator set only when all guards and electrical enclosures are in place.

Tools: DC voltmeter

  1. Measure DC voltage between lead 31A (+) and ground (- ) with sender submerged in coolant; voltmeter indicates approximately 12.5 VDC.
  2. Measure DC voltage between lead 31A (+) and ground (- ) with sender removed from coolant for at least 5-15 seconds; voltmeter indicates a drop to approximately 7 VDC.
3-Wire Low Water Level Sender Test diagnostic

⚠ Hot engine and exhaust system can cause severe injury or death. Do not work on the generator set until it cools.

⚠ Hazardous voltage. Moving parts. Will cause severe injury or death.

Tools: Ohmmeter

  1. Measure resistance between lead 31 and ground with sender submerged in coolant; ohmmeter indicates a high resistance reading.
  2. Measure resistance between lead 31 and ground with sender removed from coolant for at least 5-15 seconds; ohmmeter indicates a low resistance reading.
Battery Equalizer Troubleshooting diagnostic

⚠ To prevent reverse polarity damage to the battery equalizer, remove the ground (GND) connection first and attach the ground connection last when disconnecting the battery equalizer.

Tools: 12-volt test light with alligator clips, Voltmeter with 0.01 volt resolution, Battery load tester

  1. Remove the ground (GND) connections from the battery equalizer; do not allow contact with other connections.
  2. Verify a differential of 12 volts between the +12 volt and +24 volt terminals using a 12-volt test light; the light will illuminate on a functional unit. Remove the test light.
  3. Connect the test light between the +12 volt and GND terminals; the light will illuminate on a functional unit.
  4. With the test light connected, measure and record the voltage between the +12 volt and +24 volt terminals.
  5. With the test light connected, measure and record the voltage between the +12 volt and GND terminals.
  6. Remove the test light.
  7. Compare the values from steps 4 and 5; the difference should be - 0.5 and +0.13 volts on a functional unit.
Oil Pressure Sender Testing diagnostic

Tools: Ohmmeter, Mechanical oil pressure gauge

  1. Disconnect the oil pressure sender lead 7C.
  2. Check the sender resistance with an ohmmeter.
  3. Compare resistance values when the generator set is shut down and when running at operating temperature to Section 1, Specifications.
  4. Use a mechanical oil pressure gauge to further verify correct readings.
Overcrank Test (Typical) diagnostic
  1. On gas-fueled sets, disconnect the coil wire at the distributor cap and ground it or disconnect the ignition system.
  2. On diesel-fueled sets, unplug the fuel injector harness from ECM or disconnect wire no. 70 from the injector pump solenoid.
  3. Place unit in RUN mode; observe 15-second on-off cranking cycles and maximum 75-second elapsed time to overcrank shutdown.
  4. Observe controller fault lamp and display for an overcrank shutdown.
  5. Place unit in OFF/RESET mode.
  6. Reconnect the ignition coil wire/ignition system, or reconnect the fuel injector harness/wire no. 70.
Speed Sensor Test with Generator Set Running diagnostic

⚠ Keep leads connected to the speed sensor terminals during the test; do not disconnect the leads.

Tools: DC voltmeter

  1. Connect a DC voltmeter between positive (+) lead (wire 24) at the speed sensor and ground (wire 2) with master switch OFF/RESET; read approximately 8- 12 volts DC.
  2. Place master switch in RUN to start the generator set.
  3. Connect DC voltmeter negative probe to 0 terminal (wire 16 white) and positive probe to positive (+) terminal (wire 24 red); read approximately 7- 12 volts DC.
  4. Place master switch in OFF/RESET to stop the generator set.
  5. If sensor emits a signal, check continuity of speed sensor leads (wires 2, 16, 24) between controller P1 connector and sensor terminals.
Speed Sensor Test with Separate 12 VDC Source diagnostic

Tools: DC voltmeter, 12-volt battery or DC power supply, Flat piece of iron or steel

  1. Place master switch in OFF/RESET position.
  2. Disconnect the speed sensor leads.
  3. Connect speed sensor, DC voltmeter, and DC voltage source as shown.
  4. Touch sensing surface with a flat piece of iron or steel at least 4.1 cm (1/4 cu. in.) in size.
  5. DC voltmeter reading should equal the source voltage, approximately 12 VDC.
  6. Remove the iron or steel piece and observe a voltmeter reading of 0 VDC.
  7. If the sensor passes, it is functional; replace if it fails.
  8. Connect the speed sensor leads and adjust the air gap.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Mitsubishi S16R family

65
Part #DescriptionCategory
EGB20Air CleanerAir filter
FTG13LAir CleanerAir filter
45493-50800BE CAREFUL OF ROTATING BELT.Belt
37594-01300ThreeBond 1211 liquid gasketGasket
GM21688Gasket, cylinder headGasket
GM21730GasketGasket
GM21761GasketGasket
GM21763GasketGasket
36291-00098Oil sample bottle setOil filter
36291-19100Engine oil sampling pumpOil filter
01-00-01202--t-'""1Service part / kit
01-00-02~ 1J ✓1· i\'J~ .(I7). 9-~ ~ AT k. 3?)Service part / kit
04826-22500CAP, SEALINGService part / kit
06.2019RadiatorService part / kit
14x1517 to 123 to 167 to Tighten slitService part / kit
25493-81200Warning label for moving partsService part / kit
33707-117012008-12-10 01-00-01 1/ 1J ✓f l\•;.,r(Iv?~'b?A;-~ 1/krb. 3?)Service part / kit
37501-043002 08 * 3Service part / kit
37501-20050C HEAD ASSY, CYLINDER 2-1 TO 2-5 16Service part / kit
37501-300503 1 C HEAD ASSY. CYLINDER 2-1 TO 2-5 16Service part / kit
37501-300513 2 C HEAD ASSY, CYLINDER 2-1 TO 2-5 .Service part / kit
37501-400503 3 C HEAD ASSY,CYLINOER 2-1 TO 2-5 .Service part / kit
37501-5005001-00-01 CYLINDER HEAD (FOR ELECTRIC ST ART[NG SYSTEM)Service part / kit
37501-64052*Service part / kit
37501-70052*Service part / kit
37501-821002008-12-10 01-00-02 :11J:.,$f l\•;,~·ciri;-~ :1if 1. 3?)Service part / kit
45409-51200Warning labelService part / kit
45493-50900DO NOT TOUCH ANY ELECTRIC EQUIPMENT WHEN POWER IS ON.Service part / kit
45493-51306Warning label for oil mistService part / kit
45493-51600Warning label for maintenance and operationService part / kit
45493-60700Warning labelService part / kit
45A03-51800Warning labelService part / kit
45A03-51900Warning labelService part / kit
45A83-51100Warning label for flywheel entanglementService part / kit
45A93-50890Warning label for rotating partsService part / kit
48493-51400Warning label for high placeService part / kit
98400-3097001/12/2008 33519026401_1_1 silverhorn.co.ukService part / kit
NP-10-2rust-preventive oilService part / kit
P-1400Anti-rust oil for lubricating systemService part / kit
P-2100Anti-rust oil for fuel systemService part / kit
PR170098033RadiatorService part / kit
37411-04200Rear oil seal slingerSeal
37425-08201Front oil seal slingerSeal
GM14508O-ringSeal
GM14511O-ringSeal
GM14529Washer, sealingSeal
GM14532Washer, sealingSeal
GM14626SealSeal
GM14958Seal, oilSeal
GM15202O-ringSeal
GM15591O-ring, linerSeal
GM15592O-ring, linerSeal
GM15612PackingSeal
GM15617O-ring, rocker coverSeal
GM15641O-ring, linerSeal
GM15642O-ringSeal
GM15643O-ringSeal
GM21611O-ringSeal
GM21667PackingSeal
GM21760Oil seal assembly, rearSeal
GM21929PackingSeal
GM21600PickupSensor
32522-04100Thermo Label 75°C to 95°C (167°F to 203°F)Thermostat
32522-04200Thermo Label 100°C to 120°C (212°F to 248°F)Thermostat
32522-04300Thermo label (50 to 70 °C)Thermostat

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

Common questions

What is the displacement of the Mitsubishi S16R-Y1PTAA2-3?

The Mitsubishi S16R-Y1PTAA2-3 has a displacement of 65.4 liters with 16 cylinders.

Which generators use the Mitsubishi S16R-Y1PTAA2-3 engine?

The Mitsubishi S16R-Y1PTAA2-3 powers 2 generator set(s), including Kohler 2000REOZM, Mitsubishi S16R-Y1PTAA2.

What is a common problem with the Mitsubishi S16R-Y1PTAA2-3 engine?

A commonly reported issue on generators using the Mitsubishi S16R-Y1PTAA2-3 is: Emergency Stop. Fix: Reset the emergency stop switch..