BMW 5251 Service Manual page 284

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I
Camshaft Timing Chain
- --
Install BMW special tool 11
6
150
(VANOS setup bracket) to
front of cylinder head timing case. Tighten nuts (arrows) by
hand, and then tighten down uniformly until special tool is in
full contact with cylinder head.
CAUTION-
Male sure all gasket material is removed from face of cylin-
der head. Clean sealins face and keep free of oil.
Secure camshaft impulse sprockets and wheels:
Pretighten Torx screws (A) on exhaust camshaft impulse
wheel to approx. 5 Nm (44 in-lb).
Pretighten mounting nuts (B) on exhaust and intake
sprocket assemblies to approx. 5 Nm (44 in-lb).
-
Torque down Torx screws (A) and nuts ( 8 ) to flnal
specifications.
Tightening torques
Sprocket assembly
to
camshaft
initial torque
5
Nm
(44
in-lb)
Sprocket assembly
to
camshaft
M7
Torx screw
(A)
20 Nm (15 fl-lb)
ivl6
mounting nut
(B)
10
tdm
(89
in-lb)
-
Remove flywheel locking tool from transmission bellhousing
so that crankshaft is no longer locked.
-
Remove camshaft locking tools from rear of cylinder head.
-
Crank engine over twice by hand in direction of rotation until
cylinder 1 intake and exhaust camshaft lobes face each other
-
again.
-
Secure crankshaft with BMW special tool 11 2 300.
4
Place BMW special tool 11 3 240 over camshaft ends and
measure clearance of tool to cylinder head surface.
NOJE-
I f the exhaust side of the tool (A) is not flush with the head,
camshaft timing Is incorrect. Repeat camshaft timing pro-
cedure.
*
Due to flexible sprocket design and VANOS control unit tol-
erances and play, the intake side of special tool 11 3 240
(6)
may be up to 1 mm (0.04 in) above the sudace of the
cylinder head. This is normal. Otherwise, repeat camshaft
timing procedure.