BMW 5251 Service Manual page 257

Camshaft Timing
Chain/
-
-
-
-
- -
.
- -
.
-
.
Tighten exhaust camshaft sprocket mounting bolts (arrows)
alternately in two stages.
Tightening torques
Secondary timing chain sprocltets to camshafts
Stage
1
Stage
2
5
Nm
(44
in-lb)
22
Nm
(17
ft-lb)
-
Remove crankshaft locking tool and camshaft locking tool
set.
-
install camshaft gear bolt access plugs using new sealing
washers and tighten.
-
Remove timing chain tensioning tool from side of cylinder
head. Install primary chain tensioner with new sealing wash-
er and tighten.
Tightening torques
Access plugs to VANOS control unit 50 Nm (37 ft-lb)
Primary timing chain tensioner plug to 70 Nm
(52
ft-lb)
tensioner sleeve
-
Check adjustment VANOS system, see VANOS timing,
checking and adjusting (M52 engine).