BMW 5251 Service Manual page 211

. .
Cylinder Head and Valvetrain
Install exhaust camshaft impulse wheel, aligning pointer (B)
with top edge of cylinder head (A). Install mounting nuts (ar-
rows) finger tight.
4
Pull out exhaust camshaft splined shaft to stop.
-
Press down on secondary chain tensioner and remove ten-
sioner lock-down tool.
Preload primary chain:
-
Tighten adjusting screw on BMW special tool 11 4 220 to
specified torque.
Tightening torque
Primary chain tensioner preload
0.7
Nm
(6
in-lb)