Differences between the M54 and the M52: the cylinder block of the new engine remained old, aluminum with cast-iron sleeves and with a cast-iron crankshaft, connecting rods (145 mm) changed, light pistons appeared. The cylinder head remained the same with double vanos, the long intake manifold was replaced with a new short one (-10 mm from M52TU) with wide DISA channels, which made it possible to increase power and let the engine breathe freely. In addition, a 64 mm electronic throttle and a Siemens MS43/Siemens MS45 control system (Siemens MS45.1 for US) are used.
This motor was used on BMW cars with an index of 25i.
|2000-2006 Munich Plant
|Power output, hp
|Torque output, Nm
|Cylinder bore, mm
|Piston stroke, mm
|Recommended engine oil
|Engine oil capacity, liter
|Fuel consumption, L/100 km
|Engine lifespan, km
Disadvantages of the M54B25 engine
If the engine overheats, see if the radiator needs to be cleaned, check the condition of the thermostat and the radiator cap. Helps to expel air from the cooling system.
High oil consumption in engines is associated with coking of the piston rings. We need to put on new rings. Also check the crankcase ventilation valve, it may need to be replaced.
When misfires are noticeable, the reason is the hydraulic lifters that need to be replaced.
If the red oil light is constantly on, you need to check the oil pump and oil cup. Another common problem is the failure of the camshaft position sensor. It should be borne in mind that the thread under the cylinder head is not highly reliable.
Timely diagnostics and replacement of worn parts will ensure the convenience and reliability of engine operation.