BMW 5251 Service Manual page 274

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[Camshaft Timing Chain
4
Disconnect electrical harness connector (A), oil line fitting
(B), and cranltcase vent tube (squeeze at arrows).
NOJE-
Oil will drain from VANOS unit fitting. Use shop rags to keep
oil off drive belts.
-
Remove cylinder head cover fasteners, and cover.
4
Remove oil baffle cover from intake camshaft
4
D~sconnect electrical connections from exhaust camshaft po-
sition sensor and VANOS control valve (arrows).
4
Using banjo bolt from VANOS control unit oil line, install test
fitting (BMW special tool 11 3 450) to VANOS control unit.