The MTU 12V2000 G85 R123-8A37 is a 23.9 L 4-cycle, turbocharged, intercooled engine rated at 1800 rpm. It powers generator sets from Kohler, including the 800REOZDE. It holds 67 L (17.7 gal) of oil and 130 L (34.3 gal) of coolant.
Also known as: Detroit Diesel/MTU 12V2000 G85 R123-8A37
Part of the MTU 12V2000 engine family — 31 variants share parts & fitment.
| Oil capacity | 67.0 L |
|---|---|
| Coolant capacity | 130.0 L |
| Displacement | 23.9 L |
| Aspiration | 4-Cycle, Turbocharged, Intercooled |
| Rated speed | 1800 rpm |
| 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 | Frequency regulation, no-load to full-load | Isochronous | ||
| Other | Frequency regulation, steady state | 0.25 | % | |
| Other | Max. restriction of cooling air, intake and discharge side of radiator | 0.125 (0.5) | kPa (in. H2O) | |
| 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. | |
| Pressure | Max. return line restriction (fuel) | 50 (14.7) | kPa (in. Hg) | |
| Pressure | Maximum allowable back pressure (exhaust) | 8.5 (2.5) | kPa (in. Hg) | 60 Hz |
| Pressure | Min./max. fuel pressure at engine supply connection | --30/50 (--8.8/14.8) | kPa (in. Hg) | |
| Speed | Rated rpm | 1800 (60 Hz); 1500 (50 Hz) | rpm | |
| Temperature | Ambient temperature (radiator system) | 50 (122) | _C (_F) | enclosure with enclosed silencer reduces capability by 5_C (9_F) |
| Temperature | Exhaust temperature at rated kW, dry exhaust | 580 (1076) (60 Hz); 565 (1049) (50 Hz) | _C (_F) | at rated kW, dry exhaust |
| Voltage | Voltage regulation, no-load to full-load (alternator) | 0.25 | % |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | #2 Diesel | Fuel supply line min. ID 12 mm (0.5 in.); fuel return line min. ID 6 mm (0.25 in.); max. fuel flow 480 Lph (127 gph) |
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 |
|---|---|---|
| X00024740 | LUFTFILTER | Air filter |
| X00023803 | HALTER FUER LUFTFILTER | Air filter retainer |
| X00024699 | HALTER FUER LUFTFILTER | Air filter retainer |
| X00024744 | HALTER FUER LUFTFILTER | Air filter retainer |
| X00026862 | HALTER FUER LUFTFILTER | Air filter retainer |
| X00023512 | LUFTFILTER MIT GEHAEUSE | Air filter with housing |
| X00026858 | LUFTFILTER MIT GEHAEUSE | Air filter with housing |
| F6783914 | Barring tool | Barring tool |
| 916016022202 | SCHELLE BRSGU 22/20 N16016 | Clamp |
| X00041878 | COMPUTER ACCESSORIES | Computer accessories |
| X00E50200201 | VERBINDUNGSKABEL | Connecting cable |
| XS00E500.00019 | VERBINDUNGSKABEL F.KRAFTSTOFFILTER | Connecting cable for fuel filter |
| XS00E500.00020 | VERBINDUNGSKABEL F.KRAFTSTOFFILTER | Connecting cable for fuel filter |
| X00027177 | WASSERSTANDANZEIGER | Cool level display |
| 0002050165 | LUEFTERRAD | Fan wheel |
| 0002050265 | LUEFTERRAD | Fan wheel |
| 0002050365 | LUEFTERRAD | Fan wheel |
| 0002050465 | LUEFTERRAD | Fan wheel |
| 0002050765 | LUEFTERRAD | Fan wheel |
| 0002051165 | LUEFTERRAD | Fan wheel |
| X00004420 | LUEFTERRAD FUER ASIEN | Fan wheel |
| X00006230 | LUEFTERRAD FUER ASIEN | Fan wheel |
| 304032008014 | SECHSKANTMUTTER M 8 ISO4032 | Hex nut |
| 0035337089 | BEZEICHNUNGSSCHILD | Identification plate |
| F6790507 | Alignment device used in Injector Removal and Installation | Injector |
| X00029071 | SICHERUNGSSCHEIBE | Lockwasher |
| 000908010002 | PLUG | Oil filter |
| X52218500060 | OELLEITUNG F.ATL,RECHTE SEITE SB OIL LINE F/TURBOCHARGER,RIGHT | Oil line |
| X52218500061 | OELLEITUNG F.ATL,LINKE SEITE SB OIL LINE F/TURBOCHARGER,LEFT | Oil line |
| X53518500001 | OELLEITUNG SB OIL LINE | Oil line |
| 000125008427 | WASHER | Service part / kit |
| 0005316288 | FRONTRAHMEN MIT HALTER NN 62,5MM FRONTRING MIT HALTEBÜGEL | Service part / kit |
| 0005316481 | LAMPE MN 28V/3W, WEISS MATT | Service part / kit |
| 0005327256 | DC/DC WANDLER | Service part / kit |
| 0005335331 | ANZ-GERAETEZUBEHOER MN F.ALLE GERAETE 52MM | Service part / kit |
| 0015312984 | SCHR-STECKVERBINDER | Service part / kit |
| 0085311283 | FLACH-STECKVERBINDER | Service part / kit |
| 0165310783 | BAJO-STECKVERBINDER | Service part / kit |
| 0165310883 | BAJO-STECKVERBINDER | Service part / kit |
| 0175318183 | BAJO-STECKVERBINDER | Service part / kit |
| 5355306734 | CABLE F/TEST/SERVICE UNIT | Service part / kit |
| 700425000169 | PLATE | Service part / kit |
| 700425000170 | PLATE | Service part / kit |
| F30453001 | Angular screw driver used in Valve clearance Check and Adjustment | Service part / kit |
| M015650/04E | Operating Instructions | Service part / kit |
| MS15019/02S | Manual de uso y mantenimiento | Service part / kit |
| X00030407 | CRANKCASE | Service part / kit |
| X00032819 | OIL FILLER NECK | Service part / kit |
| X00039828 | PRESSURE GAUGE F/ENGINE OIL PRESS | Service part / kit |
| X00042159 | DIASYS2.XX;USB-DONGLE+CD;CUSTOM; | Service part / kit |
| X00E50200035 | KABEL F.PRUEF/SERV-GERAET AB 3X2X0,25QMM; D | Service part / kit |
| X00023857 | REGENKAPPE FUER LUFTFILTER | Rain shroud for air filter |
| X00024696 | REGENKAPPE FUER LUFTFILTER | Rain shroud for air filter |
| X00024742 | REGENKAPPE FUER LUFTFILTER | Rain shroud for air filter |
| X00026860 | REGENKAPPE FUER LUFTFILTER | Rain shroud for air filter |
| X00031325 | FEDERELEMENT | Resilient element |
| 5221870440 | HALTER | Retainer |
| 304017008086 | SECHSKANTSCHRAUBE M 8 X 45 ISO4017 | Screw |
| X00038018 | ZYLINDERSCHRAUBE | Screw |
| X00041115 | SCHRAUBSTUTZEN FUER ATL-SCHMIERUNG SCREW-FITTING UNION F/TURBO LUBRICATION | Screw fitting union |
| X00032384 | CRANKCASE W. SEAL | Seal |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.
The MTU 12V2000 G85 R123-8A37 engine has an oil capacity of 67.0 liters.
The MTU 12V2000 G85 R123-8A37 has a displacement of 23.9 liters.
The MTU 12V2000 G85 R123-8A37 powers 1 generator set(s), including Kohler 800REOZDE.