Vanos Control Unit Installation - BMW 1999-2005 M3 Service Manual

Camshaft Timing Chain
9 of 19
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Do not crank or turn over engine with
VANOS unit removed. Piston/valve
interference is possible.
VANOS control unit, installing
Clean contact edges of cylinder head
face and VANOS unit and apply a thin
coat of sealing compound (3-Bond®1209
or equivalent) to surfaces.
CAUTION!
Make sure all gasket material is
removed from face of cylinder
head. Clean sealing face and
keep free of oil. If any foreign
material is present on the sealing
surface, the camshaft timing will
be incorrect.
Check locating dowel (A) and
dowel sleeve (B) at top of cylinder
head for damage or incorrect
installation.
Note:
If the Double VANOS control unit is
being replaced, be sure to check
and adjust camshaft timing as
described later in this group.
If work being carried out has no
effect on camshaft timing, it is not
necessary to recheck the timing. It
is recommended however that the
VANOS operation be checked using
a compatible scan tool.
Using new gasket, install VANOS
-
unit to cylinder head.
2/25/2009 9:52 PM