The BMW M67D44 engine is the second engine in the M67 series with a displacement of 4.4 liters and was produced in two power versions. When developing this unit, the main task was to increase power and reduce weight. As a result, power has been increased by 16% while reducing weight by 14%. At the same time, BMW engineers managed to achieve these indicators without increasing fuel consumption, the reason for which was a new lightweight crankcase made of aluminum alloy, innovative fuel injection technologies and a particulate filter.
The first M67D44O1 version with 299 hp was produced throughout 2005 and installed on the 745d E65.
The second M67TU D44 version with 329 hp was installed on the updated 745d E65, and was produced from 2005 to 2008.
The M67 family also includes: M67D40.
The engine was installed on:
- BMW 7-Series E65 in 2005 – 2008.
Specifications
| Production years | 2005-2008 |
| Displacement, cc | 4423 |
| Fuel system | Common Rail |
| Power output, hp | 299 (M67D44O1) 329 (M67D44TU) |
| Torque output, Nm | 700 (M67D44O1) 750 (M67D44TU) |
| Cylinder block | cast iron V8 |
| Block head | aluminum 32v |
| Cylinder bore, mm | 87 |
| Piston stroke, mm | 93 |
| Compression ratio | 17.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | biturbo |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 9.25 |
| Fuel type | diesel |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for BMW 745d 2005) — city — highway — combined |
12.8 6.8 9.0 |
| Engine lifespan, km | ~350 000 |
Disadvantages of the M67D44 engine
- This motor is very reliable, but it is difficult to find a service station that will undertake its repair;
- Turbines cause the most problems: the resource is modest, but they are very expensive;
- Another weak point of a diesel engine is flow meters, they have to be changed often;
- Loss of traction or erratic engine operation hints at contamination of the AGR valve;
- Also, the valves in the oil cup and the crankcase ventilation system are often disturbed.
