The 1.5-liter diesel engine Mini Cooper D with the code B37C15A is produced since 2014 and is installed in third-generation Mini cars, including Clubman and Countryman models. This engine belongs to the BMW B37 diesel engine family and is characterized by high fuel economy and good performance.
The B37C15A is part of BMW’s modular engine range, which includes both gasoline and diesel units. These engines were developed with a focus on maximizing versatility, so they share common components and architecture with other BMW engines, making production more efficient. BMW and Mini utilize a modular approach to reduce costs and improve performance.
B37C15A engine specifications
| Parameter | One D | One D / Cooper D |
|---|---|---|
| Precise volume | 1496 cm³ | 1496 cm³ |
| Power system | Common Rail | Common Rail |
| Power | 95 hp | 116 hp |
| Torque | 220 Nm | 270 Nm |
| Cylinder block | aluminum R3 | aluminum R3 |
| Cylinder head | aluminum 12v | aluminum 12v |
| Cylinder diameter | 84 mm | 84 mm |
| Piston stroke | 90 mm | 90 mm |
| Compression ratio | 16.5 | 16.5 |
| Engine Features | DOHC, intercooler | DOHC, intercooler |
| Hydrocompensators | Yes | Yes |
| Transmission timing | Chain | Chain |
| Fasoregulator | No | No |
| Turbocharger | Mahle BV065 | Mahle BV065 |
| Oil | 4.4 liters 5W-30 | 4.4 liters 5W-30 |
| Fuel type | Diesel | Diesel |
| Environmental class | EURO 6 | EBRO 6 |
| Example service life | 270,000 km | 240,000 km |
Which cars the engine was installed in
- Mini Clubman 2 (F54): 2015 to present
- Mini Hatch 5-door 3 (F55): 2014 – 2019
- Mini Hatch 3-door 3 (F56): 2014 – 2019
- Mini Cabrio 3 (F57): 2016 – 2019
- Mini Countryman 2 (F60): 2017 – current
Main problems and defects of the B37C15A engine
- EGR valve (AGR) problems: One of the most common sources of problems, leading to sudden thrust failures, loss of power and twitching.
- Transmission Timing Chain: Compared to the previous diesel model (N47), the chains have become more reliable, but their life is limited to about 200,000 km.
- Vortex flaps: They quickly become overgrown with soot, which can cause them to jam
- Piezo injectors and particulate filter: Capricious and require constant attention
Noise and vibration problems
Three-cylinder engines, including the B37C15A, sometimes experience problems with noise and vibration that can be felt at idle or when accelerating sharply. However, BMW and Mini have actively worked to address this problem by introducing balancing technologies and improving engine mounts to minimize vibrations and make the engine run smoother.