BMW 5251 Service Manual page 145

113-51
Cylinder Head Removal and Installation
<
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
Nrn
(6
in-lb)
<
Preload exhaust camshaft sprrng plate by pressing on im-
pulse wheel while tightening mounting nuts (arrows) finger
tight.
Install BMW special tool 11 6 150 (VANOS setup bracket) to
front of cylinder head timing case. Install nuts (arrows) finger
tight, then tighten down uniformly until special tool is in full
contact with cylinder head.
CAUTION-
Make sure all gasket material is removed from face of cylin-
der head. Clean sealing face and keep free of oil. If any for-
eign material is present on the sealing sudace, the camshait
timina will be incorrect.