Manufacturer BMW Configuration Inline-6 Cylinder bore 80 mm | Production 1991-2000 Displacement 2497 cm Piston stroke 82,8 mm | |
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The BMW M51 is an inline 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 with a Bosch VP20-swirl-chamber-injection. Some engine variants have an intercooler in addition to the turbocharger, they can be identified by the tds. The M51 is an engine made of cast iron, it has one chain driven overhead camshaft and two valves per cylinder. Compared to the M21 the M51 has now tappets and a hydraulic valve lash adjustment. The fuel injection in the first engines is controlled by the ECU Bosch DDE 2.1, which was replaced after the first technical revision by the DDE 2.2. This results in greater torque at lower revs. For lubrication SAE 5W-40 oil is used.
Applications: