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COMPLETE ENGINE : Engine  BMW N42B20

The 4-cylinder N42B20 engine replaced the obsolete M43B18M43B19 and M44B19 in 2001. Instead of a heavy cast-iron cylinder block, a light aluminum one with cast iron liners was used in the new engine.

    PRODUCT INTRODUCTION

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    The 4-cylinder N42B20 engine replaced the obsolete M43B18, M43B19 and M44B19 in 2001. Instead of a heavy cast-iron cylinder block, a light aluminum one with cast iron liners was used in the new engine.
    The N42B20 engine uses a new long-stroke crankshaft (90 mm stroke) as well as new pistons and connecting rods. The balance shafts remain the same as on the M43TU and fitted to the new block.

    Instead of the previous SOHC 8V cylinder head, a new twin-shaft 16-valve with a timing block was used. In addition, the new cylinder head is equipped with a variable valve timing system on both Double-VANOS shafts, as well as a Valvetronic intake valve lift system. The diameter of the intake valves is 32 mm, exhaust 29 mm. Characteristics of standard BMW N42 camshafts: phase 250/258, rise to 9.7/9.7.

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    The intake manifold of the N42B20 is equipped with a DISA variable length system, which greatly optimizes performance at both low and high speeds. Bosch ME 9.2 engine management system.
    This motor was used on BMW cars with the 18i index.


    Specifications

    Production years

    2001-2004

    Displacement, cc

    1995

    Fuel system

    injector

    Power output, hp

    143 /6000 rpm

    Torque output, Nm

    200 /3750 rpm

    Cylinder block

    aluminum R4

    Block head

    aluminum 16v

    Cylinder bore, mm

    84

    Piston stroke, mm

    90

    Compression ratio

    10.0

    Features

    Valvetronic

    Hydraulic lifters

    yes

    Timing drive

    chain

    Phase regulator

    double VANOS

    Turbocharging

    no

    Recommended engine oil

    5W-30

    Engine oil capacity, liter

    4.25

    Fuel type

    petrol

    Euro standards

    EURO 3

    Fuel consumption, L/100 km (for BMW 318i 2002)
    — city
    — highway
    — combined

    10.0
    5.5
    7.2

    Engine lifespan, km

    ~275 000

    Weight, kg

    120



    Disadvantages of the N42B20 engine

     Most of the problems for owners are caused by failures in Valvetronic and Vanos systems;
     The timing chain and its tensioner often require replacement already at a range of 100 – 150 thousand km;
     The engine is very hot, which greatly affects the life of the valve stem seals;
     Non-original oil may not withstand these temperatures and the engine will seize;
     When replacing candles, expensive ignition coils very often fail here.