BMW 5251 Service Manual page 210

/Cylinder Head and Valvetrain
4
Insert sprocket mounting bolts (arrows) on exhaust side
carnshaft assembly.
Initially tighten to approx. 5 Nrn (44 in-lb) and then back off
by half a turn.
4
Fit thrust spacer (A) on exhaust camshaft.
4
Install spring plate (A) to exhaust camshaft. Make sure that
(F) mark is visible.
NOTE-
If F marlc is no longer visible, install spring plate as shown in
inset.