Engine BMW N42B20 under the hood

Engine BMW N42B20

The N42B20 has four cylinders in a row. This motor began to be used in 2001, it replaced the M43V18 engine and its brothers: B19 and M44V19. The heavy cast-iron engine block was replaced with a lightweight one made of aluminum, but with cast-iron sleeves. This unit uses a new 90mm long travel crankshaft with new connecting rods and pistons. As for the balancer shafts, they were not changed, they remained the same as on the M43TU.


Manufacturer BMW Plant Hams Hall
Also called N42
Production years 2001-2004
Cylinder block alloy aluminum
Fuel system injector
Configuration inline
Number of cylinders 4
Valves per cylinder 4
Piston stroke, mm 90
Cylinder bore, mm 84
Compression ratio 10
Displacement, cc 1995
Power output, hp 143/6000
Torque output, Nm / rpm 200/3750
Fuel type 95
Euro standards Euro 3
Weight, kg 120
Fuel consumption, L/100 km
— city
— highway
— combined
Oil consumption, gr/1000 km up to 7000
Recommended engine oil 5W-30 / 5W-40
Engine oil capacity, liter 4.25
Amount of engine oil for replacement, liter 4
Oil change interval, km 10000
Engine lifespan, km
— official information
— real


Frequent problems

When the BMW N42B20 engine is running, the following malfunctions may occur: overheating, the appearance of noise.

Engine BMW N42B20If you notice that the unit is overheating, you need to check the radiator. It is rarely cleaned and contamination can lead to a problem. The reason sometimes lies in the breakdown of the thermostat, the resource of which is 100 thousand kilometers. As a result, the valve stem seals become unusable – the oil is consumed quickly. The operation of the cooling system should be closely monitored.

When the engine is noisy, this can be corrected by replacing the chain tensioner, which has a resource of 100 thousand kilometers. The timing chain is also designed for 100 thousand kilometers, over time it stretches and makes noise. In the process of replacing the spark plugs, BREMI ignition coils may be damaged, it is recommended to replace them with EPA.

When using the BMW N42B20 engine, choose high quality working fluids. It is advisable to fill in the oil of the brand recommended by BMW. Saving on oil is unwise and can lead to engine overhaul.

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