BMW 3 (E46). Manual — part 37

bottom of secondary air pump.

Remove bracket from strut tower.

Separate oxygen sensor electrical
harness connectors (arrows) and
mounting clip (A) on right side of
engine.

Remove chassis ground strap (arrow)
at right engine mounting pedestal.

Install an engine lifting device (BMW 11
0 000 or equivalent) to the front and
rear engine supports and raise engine
until its weight is supported. Detach left
and right engine mounts.

-

Carefully raise engine out of car,
checking for any wiring, fuel lines,
or mechanical parts that might
become snagged as engine is
removed.

When reinstalling, make sure locating
pin on left engine mount (arrow) seats
correctly in slot of subframe boss.

-

Installation is reverse of removal,
noting the following:

Replace all gaskets, O-rings and
seals.

Change engine oil and filter and
check all other fluid levels. See

020 Maintenance

.

Refill and bleed cooling system.
See

170 Radiator and Cooling

System

.

Use new fuel injector seals.

Carefully check intake manifold
gasket and replace if necessary.

Inspect O-ring seal between mass
air flow sensor and air filter
housing. To facilitate reassembly,
coat seal with acid-free grease.

CAUTION!

When reattaching throttle assembly
harness connector, connector is fully
tightened when arrows on connector
and plug line up.

Check that engine drive belts
properly engage pulley grooves.

Install exhaust manifolds using
new gaskets and self-locking nuts.
Use copper paste on threads.
See

180 Exhaust System

.

Tightening torques

Coolant drain plug
to cylinder block

25 Nm (18 ft-lb)

Engine mount to subframe

M10

45 Nm (33 ft-lb)

Exhaust manifold to cylinder head

M6

10 Nm (8 ft-lb)

M7 or M8

20 Nm (15 ft-lb)

Intake manifold to cylinder head

M7

15 Nm (11 ft-lb)

M8

22 Nm (16 ft-lb)

Radiator cooling
fan to coolant
pump

40 Nm (30 ft-lb)

Radiator drain
screw to radiator

2.5 Nm (22 in-lb)

113-1

General

This group covers E46 cylinder head
removal and installation as well as
cylinder head/valve diagnosis
procedures.

The information given in this repair
group assumes that the engine is
installed in the engine bay. In order to
remove the cylinder head from the
engine block, the VANOS control unit
and the camshafts must be removed
from the cylinder head. For cylinder
head and valvetrain reconditioning
information, see

116 Cylinder Head

and Valvetrain

.

Note:

If a head gasket problem is suspected,
a compression test or leak-down test
will usually detect the fault. See

Diagnostic Testing

later in this group.

Special tools

Special BMW service tools are required
to properly remove and install the
cylinder head on engines covered by
this manual. The special tools are used
to time the valvetrain to the crankshaft,
to remove the VANOS control unit, the
camshafts and the Torx (E12) head
bolts. Read the entire procedure
through before beginning the job.

Rotary angle dial gauge BMW special
tool 00 9 120