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BMW M51

FieldValue
nameBMW M51
imageM51_Motor.JPG
manufacturerBMW
production1991-2000
predecessorBMW M21
successorBMW M57
configurationInline-6
displacement2497 cc
bore80 mm
stroke82.8 mm
blockCast iron
valvetrainSOHC 2 valves x cyl.
compression22.0:1
turbochargerSingle turbo, tds-engines also have an intercooler
fuelsystemSwirl-chamber-injection
managementBosch DDE 2.1
fueltypeDiesel fuel (DIN 51601)
coolingsystemWater-cooled
power85-105 kW
torque222-280 Nm
weight132 kg

The BMW M51 is an inline-6 cylinder Diesel engine produced by the Upper Austrian BMW plant in Steyr from July 1991 through February 2000. Its predecessor is the BMW M21; the successor is the BMW M57.

Description

The M51 is a water-cooled and turbocharged inline six-cylinder diesel engine. It is an indirect injection design with fuel supplied by a Bosch VP37 mechanical injection pump. The displacement is 2,497 cc (152.4 cu in) and the compression ratio is 22.0:1.

Some engine variants have an intercooler in addition to the turbocharger; vehicles so equipped can be identified by the designation tds. The M51 has a cast iron block and aluminum head, one chain driven overhead camshaft, and two valves per cylinder. Compared to the M21 the M51 features tappets and hydraulic valve lash adjustment. The fuel injection in the first engines and all E36 models is controlled by the Bosch DDE 2.1, which was replaced after the first technical revision by DDE 2.2, resulting in greater torque at lower revs. For lubrication SAE 5W-40 oil is used.

VersionPowerTorqueYears
M51D25 UL115 hp-metric
at 4800 rpm222 Nm
at 1900 rpm1991–1997
M51D25 OL105 kW
at 4800 rpm260 Nm
at 2200 rpm1991–1996
Opel X25DT130 hp-metric
at 4800 rpm250 Nm
at 1400 rpm1994–2001
M51D25TÜ UL115 hp-metric
at 4800 rpm230 Nm
at 1900 rpm1996–1998
M51D25TÜ OL105 kW
at 4800 rpm280 Nm
at 2200 rpm1996–1998
M51D25TÜ OL105 kW
at 4600 rpm1998–2000
M51D25M1100 kW
at 4400 rpm270 Nm
at 2300 rpm1995-2001

Applications:

  • 1991 - 1996 BMW 325td (M51D25 UL)
  • 1996 - 1998 BMW 325td (M51D25TÜ UL)
  • 1993 - 1996 BMW 325tds (M51D25 OL)
  • 1996 - 1998 BMW 325tds (M51D25TÜ OL)
  • 1992 - 1996 BMW 525td (M51D25 UL)
  • 1991 - 1996 BMW 525tds (M51D25 OL)
  • 1996 - 2000 BMW 525tds (M51D25TÜ OL)
  • 1996 - 2000 BMW 525td (M51D25TÜ UL)
  • 1996 - 2000 BMW 725tds (M51D25TÜ OL)
  • 1995 - 2001 Range Rover (P38A)
  • 1995 - 2001 Opel Omega B
  • 1992 UMM Alter II (single example; engine, gearbox, and electronics were fitted by BMW in Munich)

References

References

  1. "BMW M41 and M51 Diesel Engines".
  2. "Vauxhall V94 - Omega B confidential launch guides".
  3. (July 2025). "Detailed specs review of 1995 Opel Omega 2.5 TD model for Europe".
  4. "Opel Omega 2.5 TD CD Manual 4 doors specs".
  5. "Die BMW Turbodiesel".
  6. "Betriebsanleitung zum Fahrzeug. [BMW 5er Limousine/touring (E39)]".
  7. [http://www.bimmertoday.de/2012/01/21/die-bmw-sportdiesel-von-524td-e28-uber-530d-e39-bis-m550d-f10/ Die BMW-Sportdiesel: Von 524td E28 über 530d E39 bis BMW M550d F10] (german)
  8. [http://www.dieseltuning.de/tuning-fuer-alle-motoren/opel/omega/opel-omega-b-2-5-td-96-kw-130-ps-motor-25dt-x25dt-x25td-eco-optimierung-leistungssteigerung/a-1928471149/ Opel Omega B 2.5 TD 96 kW 130 PS - Motor: 25DT, X25DT, X25TD - Eco Optimierung / Leistungssteigerung] {{Webarchive. link. (2016-06-23 (german))
  9. Etzold: [http://www.delius-klasing.de/sixcms/media.php/9/swg_bmw_5er_leseprobe.pdf So wird's gemacht: pflegen – warten – reparieren. Band 102, BMW 5er E39] {{Webarchive. link. (2017-05-17 Delius Klasing Verlag. Pages 12 and 13 (german))
  10. [http://www.ultimatespecs.com/de/car-specs/BMW/195/BMW-E38-7-Series-725-tds.html BMW E38 7 Series 725 tds Technical data]
  11. [http://www.oil-club.ru/wp-content/uploads/2013/01/BMW.pdf Übersicht der Motorölqualitäten]. Page 7 (german)
  12. [http://www.automobile-catalog.com/car/1997/1398605/range_rover_2_5_dse.html Automobile Catalogue: 1997 Range Rover 2.5 DSE (model for Europe ) specifications & performance data review] {{Webarchive. link. (2016-05-06 .)
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