Technical data (BMW 3 Series E46)

General information

Engine codes:

• 1796 cc engine with variable valve timing mechanism (Valvetronic) — N42B18
• Engine 1895 cm³ — M43TUB19
• 1995 cm³ engine with variable valve timing mechanism (Valvetronic) — N42 B20

Cylinder diameter:

• Engine N42 B18 - 84.00 mm.
• Engine N42 B20 - 84.00 mm
• Engine M43TU - 85.00 mm

Piston stroke:

• Engine N42 B18 - 81.00 mm
• Engine N42 B20 - 90.00 mm
• Engine M43TU - 83.50 mm

Maximum engine power:

• Engine N42 B18 - 85 kW at 5500 rpm
• Engine N42 B20 - 105 kW at 6000 rpm

Engine M43TU:

• High power version - 87 kW at 5500 rpm
• Low power version - 77 kW at 5300 rpm

Maximum engine torque:

• Engine N42 B18 - 175 Nm at 3750 rpm
• Engine N42 B20 - 200 Nm at 3750 rpm

Engine M43TU:

• High power version - 180 Nm at 3900 rpm
• Low power version - 165 Nm at 2500 rpm

The direction of rotation of the engine is clockwise (if you look at the engine from the front)

Location of cylinder 1 - from the timing chain side

The firing order of the cylinders is 1-3-4-2

Minimum compression - 9.0... 12.0 bar

Compression ratio:

• Engine N42B18 - 10.25
• Engine N42 B20 - 10.00
• Engine M43TU - 9.7

Balance shafts

Gear engagement clearance:

• Engine M43TU - 0.06-0.09 mm

Camshafts

• Axial clearance - 0.085- 0.150 mm

Lubrication system

Minimum oil pressure at idle:

• Engine N42 - 1.0 bar
• Engine M43TU - 0.5 bar

Pump rotor clearances:

• The gap between the outer rotor and the pump body is 0.120-0.196 mm
• Axial clearance of the inner rotor - 0.020-0.065 mm
• Axial clearance of the outer rotor - 0.040-0.090 mm