BMW 5251 Service Manual page 207

11
6-31
Cylinder Head and Valvetrain
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Install primary timing chain on timing chain sprocket and
place on exhaust camshaft so that pointer on sprocket
(arrow)
lines up with cylinder head sealing surface.
4
Insert BMW special tool 11 4 220 into timing chain tensioner
bore and bring center spindle into contact with tensioning rail.
Tighten until slack is removed, but do not pretension timing
chain.
NOTE-
BMW special tool 11 4 220 is an adjustable primary chain
tensioner and simulates the function of the tensioner.
-
Recheck arrow on primary sprocket is aligned with upper
edge of cylinder head. Reposition sprocket if necessary.
4
Insert and tighten threaded locat~ng studs
(arrows)
in ex-
haust camshaft.
Tightening
torques
Exhaust camshaft locating stud
20
Nm
(15
ft-lb)