BMW 5251 Service Manual page 218

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Cvlinder Head and Valvetrain
4
Using crankshaft center bolt, rotate engine clockwise one
complete rotation until the first cylinder is at TDC.
4
Confirm TDC position. Lobes of camshafts for cylinder head
1-4 (passengers side) should point up (arrows).
4
Remove timing chain tensioner (arrow) from right side upper
timing chain cover.
-
Remove secondary air injection pipes in front of upper timing
chain covers.
-
Remove left and right coolant hoses from coolant pump
housing.
-
Detach dipsticlc tube from upper right timing cover,