BMW 3 (E46). Manual - part 57
117-3
Camshaft Timing
Chains, Removing
Camshaft timing chain removal
requires that the engine oil pan be
removed. This requires raising the
engine and/or lowering the front
suspension subframe. See
119
Lubrication System
. Also required is
removal of the VANOS unit and
disassembly of the intake and exhaust
camshaft sprocket assemblies as
described later in this repair group.
Special BMW service tools are needed
for timing chain removal and
installation procedures. The special
tools assure proper timing of the
valvetrain. Precise marks to set the
timing on the camshafts are not
provided for reassembly. Read the
procedures through before beginning
the job.nothing
CAUTION!
If the camshafts are not properly
timed, the pistons can contact the
valves.
-
Disconnect negative (-) cable from
battery.
CAUTION!
Disconnecting the battery may
erase fault code(s) stored in
control module memory. Check
for fault codes using special
BMW diagnostic equipment.
Prior to disconnecting the
battery, read the battery
disconnection cautions given at
the front of this manual on page