BMW 5251 Service Manual page 141

Cylinder Head Removal
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a n - ]
Fit thrust spacer (A) to intake camshaft (B) and tighten down
with threaded locating studs. Place longer threaded end of
studs into camshaft (arrows).
Tightening torque
Impulse
wheel
studs
to
intake camshaft)
20
Nm
(15
ft-lb)
Fit primary sprocket to primary timing chain and install on ex-
haust 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.
-
Rechecic arrow on primary sprocket is aligned with upper
edge of cylinder head. Reposition sprocket if necessary.
Insert and tighten down threaded locating studs (arrows) in
end of exhaust camshaft. Note installed position of studs.
Tightening torques
Exhaust camshaft locating stud
20
Nm
(15 ft-lb)