BMW 5251 Service Manual page 135

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Cylinder Head Removal and
installation]
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Secure cylinder head bolts by torquing an additional 90"
each for Stage 2 and 3.
Tightening torques
Cylinder head to engine block
(aluminum block)
Stage
1
40 Nm (30 it-lb)
Stage
2
+90°
Stage 3 80'
4
lnstall intake camshaft position sensor (arrow).
4
Install lower secondary chain guide. Tighten tom bolts to
specifications. The bolt on the intake camshaft side is long
and extends into the engine block.
4
Install and tighten cylinder head-to-lower timing chain cover
bolts (arrows). (Photo shows camshafts in place).
Tightening torque
Secondary chain guide to cylinder head
10 Nm (89 in-lb)
Cylinder head to lower timing chain cover
M6
10 Nm
(89
in-lb)
M7
15
Nm
(1 1
it-lb)