BMW 5251 Service Manual page 158

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Cylinder Head Removal and Installation
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Remove upper timing chain cover fasteners (A) and cover
from left cylinder head.
4
Remove fasteners from intake camshaft sprocket (arrows)
on left cylinder head.
-
Remove primary timing chain sprocket and suspend timing
chain using mechanics wire to prevent chain from dropping
into lower housing.
Turn crankshaft counterclockwise until 45" mark on crank-
shaft is aligned with boss on front timing chain cover (arrow).