BMW M73 engine

The 5.4-liter, 12-cylinder engine BMW M73 or M73B54 was produced from 1994 to 2002 and was installed in the highest models of the company: 7 Series sedans, 8 Series coupes, and Rolls-Royce Silver Seraph. In 1998, an updated version of this engine with the index M73B54TU or M73TU was introduced. The V12 engine line also includes the following power units: M70, N73, and N74.

Technical data of BMW M73 5.4 liter engine.

M73B54 modification from stock
Exact capacity5379 cm³
Power systemdistributed injection
Engine power326 HP
Torque490 nm
Engine blockaluminum V12
Block headaluminum 24v
Cylinder diameter85 mm
Piston stroke.79 mm
Compression ratio10
Engine featuresthere is no
Hydraulic compensator. tak
Timing drivechain
Timing phase adjusterthere is no
Turbochargingthere is no
What oils to use8.5 liters 5W-40
Fuel type95
Environmental classEURO 3
Approximate life expectancy350 000 HP
Updated M73TU
Exact capacity5379 cm³
Power systemdistributed injection
Engine power326 HP
Torque490 nm
Engine blockaluminum V12
Block headaluminum 24v
Cylinder diameter85 mm
Piston stroke.79 mm
Compression ratio10
Engine featuresthere is no
Hydraulic compensator. tak
Timing drivechain
Timing phase adjusterthere is no
Turbochargingthere is no
What oils to use8.5 liters 5W-40
Fuel type95
Environmental classEURO 3
Approximate life expectancy360 000 HP

Fuel consumption BMW M73 engine

Using the example of a 1995 BMW 750iL with an automatic transmission:
City19.6 litry
Route8.6 litry
Mixed13.3 litry

Engine Overview and Common Failures

The weight of the M73 engine according to the catalog is 240 kg. The M73 engine number is located at the junction of the block and the cylinder head. First and foremost, owners should not be concerned about fuel consumption of 20 liters per 100 km. The main cause of unstable engine operation is air leakage in the intake system. Closer to 200-250 thousand km, it often requires replacement of the timing chain along with the sprockets. Also, at mileages over 200,000 km, this power unit tends to consume oil significantly. Additionally, leaks from the water pump or rear crankshaft seal are frequently encountered here.

Engine Bmw M73

BMW
7-Series E381994 - 2001
8-Series E311994 - 1999
Rolls-Royce
Silver Seraph 11998 - 2002

Engines from the same line as BMW M73 engine

See Also

BMW M43 engine

The BMW M43 petrol engine series with a capacity ranging from 1.6 to 1.9 liters was produced from 1993 to 2002 and installed in popular models such as the E34 body of the 5 Series, as well as the E36 and E46 bodies of the 3 Series. There was also a 16-valve version of the 1.9-liter engine with its own designation, M44B19. The line of BMW four-cylinder engines includes: M10, M40, N42, N43, N45, N46, N13, N20, and B48.

BMW M62 Engine

The BMW M62 V8 engine series, with a displacement ranging from 3.5 to 4.6 liters, was produced from 1996 to 2005 and installed in popular models of the company such as the E39 body style of the 5 Series and the E38 body style of the 7 Series. Alpina created a range of power units based on this engine, with a capacity of up to 5.0 liters and 400 horsepower. The V8 engine lineup also includes the following units: M60, N62, and N63.

BMW N62 Engine

The BMW N62 engine series, with a displacement ranging from 3.6 to 4.8 liters and eight cylinders, was produced from 2001 to 2010 and installed in models such as the 5-Series (E60) and 7-Series (E65). Advanced versions of this engine were also available, providing up to 530 horsepower, offered by Alpina. The V8 engine lineup also includes the following power units: M60, M62, and N63.

Peugeot Xud7 engine

The 1.8-liter diesel engine Peugeot XUD7 or 161A was produced from 1982 to 2005 and mainly installed in commercial models of the group, but it is also found in passenger cars. This engine is particularly known for the popular Citroen C15 model in Europe. The XUD series includes: - XUD7TE, - XUD9, - XUD9SD, - XUD9TE, - XUD11A, and - XUD11ATE.

Mitsubishi 4g93 Engine

The 1.8-liter Mitsubishi 4G93 engine was produced by a Japanese company from 1991 to 2014 and was not only installed in many models of this company, but also in Volvo, Proton, or Brilliance cars. The engine was available in versions with carburetor, fuel injection, direct injection, and turbocharging. The 4G9 line also includes the following engines: - 4G91, - 4G92, - 4G94.