In the early years BMW needed to complete in the medium power boat market but at the time they did not have their own diesel engine that was suitable for marine applications. They sourced the VM HRH 692 3.6 litre block and marinised it designing and manufacturing the heat exchangers and coolers. This was followed by a 5 cylinder 3 litre version. The former model came in different guises such as the BMW marine D150, D190 and D636. The later was known as the D530.
BMW D190 Marine Diesel Engine
The popular belief is that the VM Motori HR range of engines were designed primarily for marine use and were adapted for automotive and industrial use. However, this was not the case as the engines were designed from the beginning with all three uses in mind and hence the reason VM built a very sturdy, robust engine, offering high horse power to weight ratio.
At the time when BMW marine marketed this engine, it was quite a revelation in terms of diesel powered pleasure and commercial craft offering high revs with high horse power figures and very reasonable fuel economy in comparison to petrol engines of similar horse power.
Most parts are still available for the BMW Marine engines but some of the coolers, heat exchangers, water pumps and turbo chargers are now obselete, very often requiring some form of adaptations when it comes to replacement parts.