BMW 5251 Service Manual page 289

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Camshaft Timing chain1
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Remove intake camshaft sprocket mounting nuts (arrows)
and remove spring plate (labelled FRONT).
Remove tom screws from exhaust camshaft sprocket
(arrows).
Lift off exhaust and intake sprockets with secondary chain,
thrust spacer (A) and splined shaft (B).
CAUTION-
Splined shafts for both intake and exhaust camshafts share
the same part numbe,: Remove and mark used splined
shafts in order to reinstall in original locations.
4
Remove exhaust camshaft splined sleeve (A) and shaft (8).