BMW 5251 Service Manual page 301

C p
Camshaft
- -
Timing Chain
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 (6) on exhaust and intake sprocket
assemblies to approx.
5
Nm (44 in-lb).
Torque down mounting screws (A) and nuts
(6)
to iinal
specifications.
Tightening torques
Sprocket assembly
to
camshaft
initial torque
5
Nrn
(44
in-lb)
Sprocket assembly to camshaft
M7
Torx screw
(A) 20
Nm
( I 5
it-lb)
M6
mounting nut
( 8 ) 10
Nm
(89
in-lb)
-
Remove flywheel locking tool from transmission bellhousing
so that crankshaft is no longer secured.
-
Remove camshaft loclting tools from rear of camshafts.
4
Crank engine over by hand 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 11 3 240 over camshaft ends and
measure clearance of tool to cylinder head surface.
NOTE-
* I f the exhaust side of the tool is not flush with the head (gap
A), retime the camshafts as described laler in this repair
group.
Due to flexible sprocket design and VANOS control unit tol-
erances and play, the intake side of special tool 7 1 3 240
may be up to I mm (0.04 in) above the suriace of the cyl-
inder head (gap B). This is normal. Otherwise, retime the
camshafts as described in VANOS timing, checking and
adjusting (M52 TU a n d 11154 engines).
-
Remove VANOS setup bracket from front of cylinder head
-
Install VANOS control unit. See VANOS control unit, in-
stalling
( 0 1 1 5 2
TU and M54 engines).
-
Install intake camshaft oil baffle