BMW 5251 Service Manual page 283

Camshaft Timing chain]
4
Pull out exhaust camshaft splined shaft to stop.
-
Make sure camshafts are secured in TDC position using
BMW soecial tools 11 3 240 and 11 3 244.
4
Preload primary chain tensioning rail:
Tighten adjusting screw on BMW special tool 11 4 220.
Tightening torque
Primary chain tensioner preload 0.7 Nm (6 in-lb)
4
Preload exhaust camshaft spring plate by pressing on im-
pulse wheel. Tighten mounting nuts (arrows) by hand. Do
not tighten fully.