BMW 3 (E46). Instruction - page 41

2 of engine block (arrow).

Drain radiator into a 3-gallon pail by
removing plastic drain plug at lower left
end of radiator (arrow).

WARNING!

Use caution when draining and
disposing of engine coolant. Coolant
is poisonous and lethal to humans
and pets. Pets are attracted to
coolant because of its sweet smell
and taste. Consult a veterinarian if
coolant is ingested by an animal.
Dispose of drained coolant
according to local, state, and federal
laws.

Remove hoses from thermostat
housing by releasing locks (arrows).

-

Disconnect electrical harness at
thermostat housing.

-

Remove radiator cooling fan and
shroud as described in

170

Radiator and Cooling System

CAUTION!

On cars with viscous clutch cooling
fan, radiator fan mounting nut (32
mm) has left-hand threads.

Remove fasteners (arrows) from heater
bypass tube and set tube to side
leaving heater hose connected.

-

Unbolt power steering fluid
reservoir and pull aside without
disconnecting hoses. Tie to fender
with cord or stiff wire.

-

Remove windshield and headlight
washer reservoir:

Remove bolt on top of reservoir.

Lift tank and disconnect electrical
connections to pump and to
washer fluid level sensor.

Disconnect hoses to windshield
washer and headlight washer. Tilt
reservoir to prevent fluid from
leaking out.

Remove secondary air pump:

Disconnect hose at one-way valve
(A).

Remove bolts at support bracket
on strut tower (arrows).

Lift up pump and disconnect
electrical harness from bottom of
pump. Remove pump.

Unbolt and remove pump bracket
from strut tower.

Cylinder head cover, removing

Remove cylinder head top cover:

Remove plastic trim covers
(arrows).

Remove cover hold down nuts and
lift off cover.

Remove ignition coils.

Disconnect ignition coil harness
connectors.

Remove coil mounting fasteners.

Remove coils.

Remove ground straps.

Set coil harness to left side of
engine compartment.

-

Remove cylinder head cover
mounting fasteners and remove
cylinder head cover.

Note:

The cylinder head cover mounting bolt
insulators and gaskets should be
reinstalled in their original locations.
The three grounds mount to the first,
second and fourth central studs. Make
note of their arrangement during
removal.

-

Remove spark plugs.

CAUTION!

Stuff clean lint free rags into open
intake ports to prevent any foreign
matter from falling into the ports.

Remove oil baffle cover from above
intake camshaft.

Double VANOS
components (M52
TU, M54 engine)

1

-

Impulse wheel
mounting nut

2

-

Exhaust
camshaft
impulse wheel

3

-

Spring plate

4

-

Thrust spacer (T
= 3.5 mm)

5

-

Splined shaft

6

-

Torx screw

7

-

Exhaust
secondary
sprocket

8

-

Secondary
timing chain

9

-

Splined sleeve

10

-

Primary
sprocket

11

-

Threaded
locating stud

12

-

Secondary
chain tensioner

13

-

Secondary
chain lower
guide

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