BMW 5251 Service Manual page 146

. .- --
Cylinder Head Removal and Installation
Secure camshaft sprockets and impulse wheels:
Tighten mounting screws (A) on exhaust camshaft impulse
wheel to approx. 5 Nm (44 in-lb).
Tighten mounting nuts ( 8 ) on exhaust and intake sprocket
assemblies to approx. 5 Nm (44 in-lb).
Torque down mounting screws ( A ) and nuts ( B ) to final
specifications.
Tightening torques
sprocket
assembly
to
camshaft
initial torque
5
N m
(44
in-lb)
Sprocket assembly wheel
to
camshaft
M7
torx screws (A) 20 Nm (15
ft-lb)
M6
mounting
nuts ( 5 )
10
N m
(8
ft-lb)
-
Remove crankshaft locking tool from transmission bell hous-
ing so that crankshaft is no longer secured in TDC position.
-
Remove camshaft locking tools from cylinder head.
4
Turn engine over twice in direction of rotation until cylinder 1
intake and exhaust camshaft lobes (arrows) face each other.
-
Secure crankshaft in TDC position with BMW special tool 11
2 300.
4
Place BMW special tool set 11 3 240 over camshafts and
measure clearances.
CAUTION-
-
If the exhaust side of the tool (A) is not flush with tlie head,
camshaft timing is incorrect Reset camshaft timing as de-
scribed in 117 Camshaft Timing Chain.
* Due to flexible sprocket design, VANOS unit tolerances
and play in the VANOS splines, when the camshaft tim-
ing is set correctly, the intake side of special tool 11 3
240 (6) may be up to 1 mm (0.04 in.) above the surface
of the cylinder head. This is normal. Reassemble en-
gine. Othe~lise, reset camshaft timing as described in
11 7 Camshaft Timing Chain.
-
Remove BMW special tool 11 6 150 from front of cylinder
head.