BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP engine DIY maintenance and service manual

General Information

BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP is an 2497 cc (2.2 UK qt.) internal combustion reciprocating Inline 6 engine. It has bore/stroke ratio of 80 mm × 82.8 mm (3.15 in × 3.26 in). This engine was rated 105 kW (140.81 hp). It was used in BMW cars.

Engine Performance Rating

SAE J1349 (SAE Net)

BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	105 kW (140.81 hp)

Specifications

General

BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Diesel
Cylinder Configuration	Inline 6
Engine Displacement	152.38 in³152.38 in³2497 cc
Bore	3.15 in3.15 in80 mm
Stroke	3.26 in3.26 in82.8 mm

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Engine head and valvetrain

BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP engine head and valvetrain specifications.
Parameter	Value
Valvetrain Type	SOHC
Valves per Cylinder	2

Air Intake

BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP air intake specifications.
Parameter	Value
Air Intake Method	Turbocharger

Fuel Injection

BMW diesel straight-6 2.5 L M51 D25 (256T1) 141 HP fuel injection specifications.
Parameter	Value
Injection Type	Prechamber